DIY-Loudspeakers - Troels Gravesen

DIY Loudspeaker Copyright 2026 © Troels Gravesen, Denmark

Page IndexUpdatesBuilders PagesFor Sale News, 13th Feb 2026

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Welcome to my website! Below you will find articles on some of the work done over the last two decades. Building speakers has be on and off for more than forty years since high school, and with the availability of PC-based measuring equipment in the Nineties my hobby took another direction, as it became very much clear, that doing crossovers by calculation and fine-tuning by ear had its shortcomings. Over the years my focus has moved from small and inefficient speakers to larger constructions providing less distortion and increased dynamics, things that make reproduced music live and engaging. Below you will find speakers ranging from 2 to 300 litres volume and I hope you will find inspiration for your next DIY project or buy one of the kits from Jantzen Audio.

In case you want advice on which speaker to build, please read both "choices" and "crossovers" before writing. I shall not recommend any speaker for reasons outlined in the "choices" file, and please do not ask about the sonic differences between two speakers. What I hear is unlikely to be what you will hear. Sorry, but time doesn't allow assisting in any hypothetical combination of drivers of your own choice, nor up-grade of newer commercial speakers as well as renovation of vintage speakers not listed below. Since 2014, all schematics are closed, i.e. crossover components' values only comes with purchase of the kit. The reason for this can be read here. Crossover schematics cannot be bought alone. Should you run into problems with the constructions presented here, I'll do all I can to assist in successful implementation, but don't expect daily communication, after all my time i limited. The past few years (now 2025) we've seen newbies engaging in The Loudspeaker and similar large and complex systems - and they have run into serious trouble getting it all working properly. Take a deep breath and honestly consider your skills in woodworking and crossover layout and wiring. There may be a LOT to learn. Go through all stages of my tips page. If any of the things listed here appears alien, you may have to start small with a simple 2-way before you engage in the larger and more complex constructions.

Designing loudspeakers is not necessarily rocket science. Designing loudspeaker drivers is another thing, but picking 2-3 drivers and making a suitable cabinet and crossover is basically a matter of handling fairly simple measuring equipment, simulation software - and experience. Some call the voicing of speakers an art. I don't think so. Voicing a speakers is a matter of taste like adding spices to a stew. Some like it hot, creamy or crunchy - some don't. The ancient Greeks didn't distinguish between art and craftsmanship. Same thing. Something may be art if enough people think it is.

All technical questions, contact: [email protected]

For purchase of kits, contact: [email protected]

None of the constructions, illustrations or information presented here may be used for commercial purposes and cannot be licensed. Download terms of use here:

The constructions are divided into sections based on the main driver in the system, e.g. ScanSpeak, SEAS, SBAcoustics, AudioTechnology and Purifi. I'm very fortunate to be partly sponsored by these companies and without their generous support, very little of this would have been possible. Unless specifically stated, all constructions are based on my own preferences and I may combine drivers from different manufacturers if I think they will make good partners. Drivers from Faital, BMS and 18 SOUND are not sponsored by the companies and are all out of my own pocket, but I strongly feel quite a few products from the PA world are more than suitable for hifi application. All underlined text is a link, regardless of font properties.

Regarding frd and zrd files for crossover simulation: I do not provide these from my library and please do not send your own for evaluation.

The common habit of anonymity on discussion forums is sad, I think. Why should we spend time with nobody in cyberspace? You must be somebody. If you have questions or comments, please state your name and the country you live in to give me an idea of the hifi environment you live in. Feel sure I need your response to make this website better.

I have a lot of mails and answering takes time and please do not feel neglected if my reply is short. I regard all communication between you and me as personal, so do not post my comments or graphics on discussion forums, websites, etc. without my written consent.

ScanSpeak Constructions

Discovery:

Classic:

Revelator:

Illuminator:

Ellipticor:

FUSION SPEAKERS Speakers combining various brands: ScanSpeak, SBAcoustics, AudioTechnology, Viawave, Peerless, BMS, Faital, 18 SOUND, Purifi.

SBAcoustics Speakers

SEAS Constructions

Constructions based on the 8008-HMQ high-efficiency driver

Center speakers

Subwoofer and bass module

AudioTechnology Constructions

Up-Grade Kits for Vintage Speakers

Should I up-grade my vintage speakers? Read here.

Vintage speaker and high-efficiency stuff

My reference system Click image or heading to go to:

PAGE INDEX Recent up-dates Builders' response News Speaker constructions featuring drivers from:

ScanSpeak

SBAcoustics

SEAS

AudioTechnology High Efficiency Speakers

JA8008-HMQ High Efficiency constructions

FUSION Mix of drivers from various manufacturers, ScanSpeak, Purifi, Peerless, Faital, BMS, 18 SOUND.

Turntables and cartridges

The Jenzen speakers, 3-way transmission line designs Up-Grade Kits: JBL L100, Tannoy MG15, YAMAHA NS1000M

Subwoofers

Center speakers for surround sound

HYPEX, PAGES on the use of Hypex FUSION plate-amp/DSP modules

Open baffle speakers

Vintage speakers, JBL Tannoy, Wharfedale, Goodmans, etc

Tests and revies

Feature articles, tips, ideas, cabinet damping, coils, etc.

Tips & Ideas My system

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FOR SALE, CLICK HERE FOR FURTHER INFO

NAD C316-BEE-v2 integrated amplifier, 2 x 40 watts, phono stage, 200 EUR + shipping Like new, remote, original packing.

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RECENT UP-DATES Back to top Back to Index BOLD = new speaker constructions or significant updates.

13-02-2026: ScanSpeak Revelator-44. 28-01-2026: The-Loudspeaker-1 cabinets now available from EBEL Holztechnik

04-12-2025: Tona SUTs (MC step-up) for my systems 20-11-2025: The Loudspeaker-5, 3-way, 95-96 dB 11-09-2025: My take on making front grills 27-07-2025: Update on speaker binding posts on Jantzen Audio website 16-07-2023: More Vinyl Playroom, Charisma-103, Kiseki Agaat and Tona SUT 30-06-2025: ScanSpeak Illuminator-15 29-06-2025: Update on Vinyl Playroom, Ortofon MC X40 09-04-2025: ScanSpeak Ellipticor-28 07-02-2025: ScanSpeak Illuminator-7R 08-01-2025: SEAS CA18RLY, New Year Fun Project, free for all

03-12-2024: SEAS-22, Snell-E/III revival 18-11-2024: Purifi-6R back in portfolio 18-11-2024: Viawave GRT-145-4 now again available for The Loudspeaker-1-2 15-11-2024: ATiRi, AudioTechnology/Viawave back in portfolio 06-11-2024: Reganism, the Full Monty! 28-10-2024: Reganism... 24-09-2024: Faital-10-430 28-08-2024: Ellipticor-1824 28-08-2024: Mounting ScanSpeak Ellipticor drivers 02-08-2024: Faital-12-430, powerful 3-way classic 17-07-2024: Vinyl playroom 11-06-2024: Placement of port(s) 16-05-2024: ScanSpeak Illuminator-71, now with Beryllium dome option 25-04-2024: ScanSpeak Ekta-TL 19-03-2024: Test, vintage Snell-E-III 22-02-2024: ScanSpeak Soundbar 23-01-2024: The-Loudspeaker-CENTER

19-12-2023: Faital drivers now at Jantzen Audio. Click for further info. 16-12-2023: Flat-pack cabs for Ellipticor-84 from EBEL Holztechnik, Germany 07-12-2023: ScanSpeak Ellipticor-84, 2023 finale! 07-11-2023: New Faital bass drivers, 10RS430 and 12RS430, some tests and thoughts. 29-10-2023: Test ScanSpeak dome tweeter, D3004/602200 26-10-2023: ScanSpeak Revelator-3WC 24-10-2023: New SEAS W22NY003 driver 25-09-2023: SEAS NEXTEL-2F 16-08-2023: ScanSpeak Ellipticor-2F8 21-07-2023: ScanSpeak Ekta-7741 12-06-2023: ScanSpeak Discovery-18W-mkII 02-05-2023: ScanSpeak Ellipticor-A50-mkII 02-05-2023: ScanSpeak Revelator-51 17-04-2023: Response to ScanSpeak A50 17-04-2023: Testing SBAcoustic front grills 13-04-2023: Beryllium version of Discovery-3WC-10 17-03-2023: ScanSpeak Ellipticor-A50 at AXPONA 2023 06-03-2023: ScanSpeak, Discovery-3WC-10 10-01-2023: ScanSpeak, Ellipticor-A50 03-01-2023: Purifi-Fa

View all updates

GO TO BUILDERS' RESPONSE PAGE

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24-02-2026: AudioTechnology ATiRi+, built by George 07-02-2026: ScanSpeak Ellipticor-A50-mkII, built by Darren, UK 02-02-2026: SEAS CNO-GRANDE, built by Steven 30-01-2026: My original ScanSpeak Ellam-FLEX-3W, now by Bram in NL :-) 26-01-2026: QUATTRO-mkII, built by Jerome, France 24-01-2026: ScanSpeak Illuminator-7751, built by Antonio 20-01-2026: SEAS CNO-4, built by Javier 07-01-2026: Peerless NOMEX-164 mkII and ScanSpeak SUB, built by Stefano 06-01-2026: SEAS-CURV, built by Marius 06-01-2026: The-Loudspeaker-5, built by Otso, Finland

18-12-2025: The-Loudspeaker-CENTER, built by Bill 30-11-2025: ScanSpeak Ekta-TL, built by Metod 30-11-2025: Faital-3WC-10, built by Bas 25-11-2025: ScanSpeak Discovery-MTM, built by Thomas, Germany 23-11-2025: SBAcoustics SBA-7MD, built by Ebbe, Denmark 18-11-2025: Ellipticor-1824, The-Loudspeaker-3, Faital-3WC-10 and TL-CENTER, built by Jonathan 10-11-2025: Faital-3WC-15, built by Arvydas, Lithuania 01-11-2025: ScanSpeak Illuminator-71-Be, built by Lasse 27-10-2025: ScanSpeak Ekta-TL, built by Tommy 16-10-2025: The-Loudspeaker-3, built by Jack 04-10-2025: ScanSpeak Illiminator-7R, built by Nick 01-10-2025: AudioTechnology ATiRi+, built by Noam (with a twist!) 01-10-2025: Faital-10-430, built by Rob, UK 28-09-2025: The-Loudspeaker-3, built by Przem 24-09-2025: ScanSpeak, 12" SUBWOOFER, built by Andrea, Italy 24-09-2025: ScanSpeak BOOKSHELF, built by Ivan, Slovakia 15-08-2025: ScanSpeak Discovery-861, built by Andras 03-08-2025: ScanSpeak Illuminator-71 (TPCD dome), built by Andrew 23-07-2025: SBAcoustics, SBA-941, built by Rafal 21-07-2025: SBAcoustics, SBA-10, built by Mats, Sweden 03-07-2025: ScanSpeak Ekta-25, built by Bernard, Poland 22-06-2025: ScanSpeak Ellipticor-3, built by Trigger 13-06-2025: Faital-3WC-12, built by Marc, The Netherlands 30-05-2025: ScanSpeak Illuminator-7R, built by Robert, UK 28-05-2025: ScanSpeak Revelator-851, built by Tomas, Slovakia 25-05-2025: ScanSpeak, Illuminator-7R, built by Yu 20-05-2025: SBAcoustics, SBA-741 bass module, built by Tom 02-05-2025: The-Loudspeaker-1, built by Runner 02-05-2025: ScanSpeak Discovery-4, built by Carl 01-05-2025: SBAcoustics, SBA61-NAC, built by Ramiro, Argentina 27-04-2025: SEAS CNO-Grande, built by Frank 26-04-2025: Faital-10-430, built by Guilhem, France 24-04-2025: SBAcoustics, SBA-861-PFCR, built by Kari, New Zealand 22-04-2025: SEAS-22, built by Vidar, Norway 18-04-2025: The-Loudspeaker-3, built by Mike 12-04-2025: ScanSpeak Revelator-851, built by Magnus. Update. 05-04-2025: ScanSpeak Discovery-MTM, built by Bengt, Germany 05-04-2025: ScanSpeak Revelator-51, built by Judd, US 04-04-2025: ScanSpeak Discovery-861, built Gianni, Italy 03-04-2025: SEAS Eekels' Minis, built by Roope 23-03-2025: ScanSpeak Discovery-861, built by Rafal 19-03-2025: Faital-3WC-10, built by Keesh, NL 16-02-2025: ScanSpeak Illuminator-71, built by Lieven, Belgium 03-02-2025: SEAS CENTER PRESTIGE, built by Tibor 30-01-2025: Faital-3WC-15, built by Jason

22-12-2024: Faital-12-430, built by Koen, Belgium 18-12-2024: OBL-15, built by Søren, Denmark 08-12-2024: ScanSpeak Ellipticor-A50-II, built by Andrei 03-12-2024: ScanSpeak, Revelator-51, built by Dominick 26-11-2024: ScanSpeak Revelator-51, built by Roel 04-11-2024: SEAS Cyclop inspired speaker built by Serhii, Ukraine 28-10-2024: Faital-10-430, built by Young, Korea 27-10-2024: The-Loudspeaker-2, built by Maciej, Poland 27-10-2024: The Loudspeaker-1, built by Milliau 18-10-2024: Ekta Grande, built by Bogdan, Romania 10-09-2024: ScanSpeak Illuminator-71, built by Erik 07-09-2024: SBAcoustics, SBA-941, built by Rob, NZ 06-09-2024: TQWT-mkIII, built by Alexandre 06-09-2024: ScanSpeak Studio-101-mkII, built by Mike 06-09-2024: Faital-3WC-10, built by Kobus 28-08-2024: ScanSpeak Discovery-4, built by Petri, Finland 18-07-2024: SBAcoustics, SBA-761, built by Mike 09-07-2024: The Loudspeaker-1, built by Torben, Denmark 06-07-2024: ScanSpeak Illuminator-5, built by Tom, USA 28-06-2024: ScanSpeak Revelator-66, built by Victor, UK 23-06-2024: Faital-3WC-10, built by Olivier 20-06-2024: Faital-3WC-10, built by Robert 19-06-2024: FUSION-3WC, built by Roman 17-06-2024: Faital-3WC-15, built by Michael, Ireland 12-06-2024: ScanSpeak Revelator-851, built by Robin, England 23-05-2024: ScanSpeak Ellipticor-A50-mkII, built by Novak 21-05-2024: Peerless NOMEX-164-mkII, built by Christopher 20-05-2024: Faital-3WC-12, built by Andreas, Germany 18-05-2024: ScanSpeak Ekta-7741, built by Mike 15-05-2024: ScanSpeak Discovery-861, built by Tomas, Slovakia 30-04-2024: SBAcoustics, SBA-3WC, built by Tyler 21-04-2024: The-Loudspeaker-1, built by Uladzimir 14-04-2024: Faital-3WC-15, built by Xavier 13-04-2024: Open Baffle, OBL-15, built by Homer, UK 11-04-2024: SBAcoustics, SBA-741, built by Tom 09-04-2024: ScanSpeak Micro-5F/8822-T01, built by Paul 08-04-2024: ScanSpeak Illuminator-71, built by Ignas 25-03-2024: ScanSpeak Revelator-3WC, built by Thomas 23-03-2024: Faital-3WC-10, built by Alain, Australia 13-03-2024: Purifi-Be, built by Nick 11-03-2024: Faital-3WC-15, built by Bartosz 03-03-2024: SEAS-NEXTEL-2F, built by Jason, UK 25-02-2024: The-Loudspeaker-3, built by Jonathan, Israel 18-02-2024: The-Loudspeaker-2, built by Ireneusz 03-02-2024: SEAS CNO-4, built by Andreas, Sweden 02-02-2024: ScanSpeak Illuminator-71, built by Leo 30-01-2024: AudioTechnology AT-SW, built by Larry 27-01-2024: SBAcoustics, FUSION-22, built by Frank 23-01-2024: ScanSpeak Ekta-7741, built by Mark 17-01-2024: SBAcoustics, FUSION-22, built by Robert, US 16-01-2024: The Loudspeaker-1, built by Philippe, Belgium 11-01-2024: ScanSpeak Discovery-3WC-mkII, built by Rune 04-01-2024: SBAcoustics, SBA-MTM, built by Stephen

Go to all builders' response 2008-2023, chronologically

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HES, High-Efficiency Speaker Constructions

Read feedback from HES builders here.

Some thoughts here on high-efficiency speakers: http://www.troelsgravesen.dk/HES.htm Intro to range of high-efficiency speakers: http://www.troelsgravesen.dk/HESintro.htm

The Loudspeaker-I The Loudspeaker-II The Loudspeaker-III

The Loudspeaker-5

Faital 3WC-10

Faital-10-430

Faital-12-430

Faital 3WC-12 Faital 3WC-15

Speakers based on the JA8008-HMQ high-efficiency driver

JA8008-HMQ driver, the heart of the HES speakers below

TQWT/DTQWT-mkIII, JA8008-HMQ - SEAS T35C002/waveguide

DTQWT 212 mkIII, JA8008-HMQ+T35C002/waveguide + 2 x Eminence Deltalite II 2512 8008-CENTER mkII, for the complete 8008 surround set, built around JA8008-HMQ/T35C002 drivers QUATTRO mKII, 2-way monitor/standmount from JA8008-HMQ/T35C002 drivers TQWT/DTQWT mkIII FLAT, for those who want to upgrade the mkI/II speakers 8008-CORNER, speaker for near-wall placement 2016 OBL-15, the successor of OBL-11, now with the new JA8008-HMQ driver Read here about the MKII versions and some background that may not be included in the mkIII articles: TQWT mkII: 2-way tapered quarter-wave design, JA8008+TW034/waveguide DTQWT mkII: 3-way double tapered quarter-wave design, JA8008+TW034/waveguide + 2 x Eminence Deltalite II 2510

JA8008 used in open baffle constructions: OBL-15, the successor of OBL-11, now with the new JA8008-HMQ driver OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB OB-09, open baffle construction, JA8008/TW034 and Eminence Deltalite II 2515, 15" bass driver OB-07 open baffle experiments, Supravox 215RTF + JBL LE26/waveguide + Goodmans Axiom 150 mkII Background experiments: Tweaking the DTQWT, incl. intro to TQWT-mkII and DTQWT-mkII DTQWT experiments, JBL LE26/waveguide + Goodmans Axiom 150 mkII, Supravox 215RTF Amplifiers: Amplifiers for TQWT and DTQWT; some general thoughts on suitable amplifiers DTQWT, 10 or 12 inch. Which should I build? Back to Index

Scan-Speak Constructions

Click heading or image to go to ScanSpeak constructions' overview

3- to 5-way constructions

Revelator-44

Ellipticor-28

Ekta-TL

Ellipticor-84

Revelator-3WC

Ellipticor-2F8

Ekta-7741

Discovery-3WC-10

Ellipticor-A50-mkII

Revelator-851

Illuminator-7751

Ellipticor-3 Ellipticor-4

Ekta mkII

Illuminator-4 Illuminator-5 DISCOVERY-4 Jenzen Illuminator Ekta Grande Classic 3-ways stand-mount

Discovery 3WC mkII

2-way floorstanders

Discovery MTMBookshelf speakers

BOOKSHELF-3WC

ScanSpeak Center Speakers Illuminator-CENTER Discovery-CENTER

2-way stand-mount

ScanSpeak Illuminator-7R

Ellipticor-1824

Discovery-18W-mkII

Revelator-66

Illuminator-71

Discovery-81

Studio 101 mkII Ellipticor-One Minis

Revelator-51

Ellam-9800 mkII

ScanSpeak subwoofer

ScanSpeak 10-12" subwoofer

Other ScanSpeak stuff

Testing D3004/660000 vs D2608/913000.htm Testing ScanSpeak D2104/712000 3/4" dome tweeter ScanSpeak Micro. 5F/8422T01, the smallest speaker I've ever made Test Scan-Speak 5F/8422T01 and 10F/8414G10 full range mini drivers Test of ScanSpeak tweeters, D3004/660000 and D2904/710003, D3004/6640 Beryllium dome and D2908/7140 Beryllium dome Waveguide for ScanSpeak D2904/710003 tweeter ScanSpeak waveguides

Discontinued (Jantzen Audio does not support these kits any more and you have to source components locally) Some Kit Instructions can be bought from me. Payment by PayPal to my account. MUN17-3W, 28W/4878T00 + 18M/8631T00 + D2908/714000 (Kit Instruction with schematics and parts list can be bought) Discovery 18W, 18W/8434G00 + R2604/832000 (Kit Instruction with schematics and parts list can be bought) Revelator 4R, mini from 15W/4531G00 and R2604/832000 (Kit Instruction with schematics and parts list can be bought ScanSpeak 3W-Classic - Classic, 21W/8550-00-13M/8640-00-R2604/833000 (Kit Instruction with schematics and parts list can be bought). ScanSpeak 3W-Classic - Classic, 21W/8550-00-Eton 4-300-25Hex, R2604/833000 (Kit Instruction with schematics and parts list can be bought) ScanSpeak 3W-Classic - Classic, 21W/8550-00-Vifa PL11WH09-08-R2604/833000 (Kit Instruction with schematics and parts list can be bought) ScanSpeak Ekta-2D, fully digital 2-way with Hypex FA122 (Kit Instruction with schematics and parts list can be bought)

Open Kits:

Jensen 1071, 26W/8861T00 + 18W/8531G00 + D2905/990000 Ellam-FLEX, 2-way, 15W/8530K00 + D3004/660000 Ellam FLEX 3W, 3-way from 22W/4851T00, 15W8530K00, D3004/660000, R3004/662000 Illuminator Monitor, 18WU/8741T00 and D2904/710003 DISCOVERY 12W, built a small high-quality 4 litre mini Compact Studio Monitor, 18W/8545-K00 + R2604/832000 Ellam Discovery 15 SP44, 3-way, 18W/8530-G00 + Accuton C44 + Hiquphon OWI SP38/13, 18W/8531-G00 + D3806/8200 + D2010/8513 STUDIO 101, 18W/8542-00 and SEAS 27TFFC tweeter Back to Index

FUSION speakers, mix of drivers from various manufacturers:

FUSION (BMS, ScanSpeak/SBAcoustics) FUSION-BAD (BMS, ScanSpeak/SBAcoustics) FUSION-3 (BMS, ScanSpeak/SBAcoustics)

Faital-10-430 (Faital/ScanSpeak/SBAcoustic) Faital 3WC-10 (Faital, ScanSpeak) Faital-12-430 (Faital/ScanSpeak) Faital 3WC-12 (Faital/ScanSpeak/SBAcoustics) Faital 3WC-15 (Faital/18 SOUND/SBAcoustics)

The Loudspeaker I (BMS/18 SOUND/various super-tweeters) The Loudspeaker II (BMS/18 SOUND/various super-tweeters) The Loudspeaker III (18 SOUND bass and horn and Faital midrange) The Loudspeaker-5 (all 18 SOUND drivers, passive or semi-active)

Peerless NOMEX-164 mkII (Peerless/ScanSpeak) Purifi-Fa (Purifi/SBAcoustics) Purifi-Be (Purifi/SBAcoustics) Purifi-6661 (Purifi/SBAcoustics) Purifi-6R (Purifi/Viawave) ATELL-3 Replaced by Ellipticor-2F8 ATS-4 HE (ScanSpeak/AudioTechnology/BMS) Ellipticor-4 (ScanSpeak/18 SOUND/BMS) Jenzen Accu (Accuton/AudioTechnology) Jenzen ATS (AudioTechnology/ScanSpeak)

SEAS Constructions Click heading or image to go to SEAS constructions' overview.

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4-WAY CONSTRUCTIONS

SEAS CNO-4, with new W18NX003 and W22NY003 midbass drivers SEAS NEXT4 speaker construction

3-WAY CONSTRUCTIONS SEAS NEXTEL-2F, W18NX003 + T29CF002, Faital 10RS350 bass CNO-GRANDE, 2 x W18NX003 + W12CY003-EC + T29CF002 Jenzen SEAS NEXT T25 and -T29. The luxury versions of Jenzen SEAS ER Jenzen SEAS ER, high-end sound from budget drivers Poor Man's Strad, CA22RNX+MCA15RCY+T27TFFC 3-Way-Classic-mkII, CA22RNY+MCA12RC+27TFFC

CENTER SPEAKERS

SEAS-CENTER-EXCEL

SEAS-CENTER-PRESTIGE

2½-WAY CONSTRUCTIONS 20-35 LITER

SEAS CNO-25-mkII, 2 x W18NX001+T29CF002

2-WAY CONSTRUCTIONS

SEAS-22, based on Snell-E/III

CNO-mkIII, W18NX001 + T29CF002

MINIS

SEAS CURV, mini two-way from SEAS U16/RCY/P and SEAS 29 TFF/W

SEAS stuff: http://www.troelsgravesen.dk/Edge-coating.htm http://www.troelsgravesen.dk/W12CY003.htm http://www.troelsgravesen.dk/SEAS-W12CY006.htm http://www.troelsgravesen.dk/SEAS-W18NX003.htm http://www.troelsgravesen.dk/W22NY003.htm

DISCONTINUED: (Jantzen Audio does not support these kits any more and you have to source components locally) Acapella NEXT, W22NY001+W18NX001+T29CF001 SEAS 5INCH minis, CA15RLY, W15CY001, W15LY001, 22 TAF/G CA18RLY/22TAF-G COMPACT W15CY001 + Hiquphon OWI Scoperta, mini TLs, W15LY001 and ScanSpeak D2608/913000 MAYA, CA18RNX+T25C003 CA18RNX, 2½-way floorstander, 2 x CA18RNX + 27TDC Eekels' minis, W12CY003+22TAF/G Acapella SEas, W22EX001+W18EX001+T25C003 TJL3W, W18E001+W12CY001+HIQUPHON OWI download TJL3W, large graphics, zip file Poor Man's Strad-EXCEL, W22EX001+W15CY001+27TFFC W15CY001 + NeoCD3 TJL2W, W18E001 + T25CF001 T14RCY+SS/8513 or Hiquphon OWI SEAS W17EX001/SS-8513 W11XT, W11CY001 Acapella SE (single pdf file) Acapella LWJ, Acapella SE and Acapella SEas constructions (pdf) download Acapella SE drawings, zip file Point75i, SEAS L22RN4X-P + W15CY001 + Expolinear NDRL81 Point75A&B, ScanSpeak 18W/8535+SEAS W15CY001 + Expolinear NDRL81/alt. NEO3PDR (pdf)

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The Jenzen Speakers

What are the Jenzen speakers? Read here about the rationales behind the speakers Also check out how a range of 6" drivers perform on the Jenzen front panel

Jenzen Illuminator, 3-way TL design from ScanSpeak W26/8861T00, 18WU/8741-T00 and D3004/660000 Jenzen NEXT, 3-way TL from SEAS W26FX002, W18NX001 and T25C003/T29CF002 Jenzen SEAS ER, 3-way TL design from SEAS CA26RFX, ER18RNX and T25CF001

Jenzen speakers no longer supported by Jantzen Audio.

Jenzen ATS, AudioTechnology 10C77/18H52 and ScanSpeak Be dome Jenzen Accu mkII, 3 way TL from Audio Technology 10C77-25-10-KAP, Accuton C173-6-191E and Accuton C30-06-024 Jenzen D mkII, 3 way TL from Audio Technology 10C77-25-10-KAP, Accuton C173-6-191E and Jantzen Audio diamond JDT1024 Back to Index

CENTER SPEAKERS FOR SURROUND SOUND

TL-CENTER, center speaker for TL-1-2-3 and Faital-15

ScanSpeak Illuminator-CENTER

ScanSpeak DISCOVERY-CENTER SEAS-CENTER-PRESTIGE

SEAS-CENTER-EXCEL 8008-CENTER mkII, for the complete 8008 surround set, built around JA8008-HMQ/SEAS T35C002

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AudioTechnology Constructions

Click heading or image to go to Audio Technology constructions' overview

ATS4-HE, high-efficiency version of ATS-4. Active DSP bass section ATS-4, AudioTechnology, ScanSpeak and Jantzen Audio

AudioTechnology 3-Way Classic Jenzen ATS, 10C77 bass, special 18H52 mid and ScanSpeak Be dome

ATiRi, two-way stand-mount

PRELUDE, 10C77, 15H52 mid, ScanSpeak 9900 tweeter Discontinued at Jantzen Audio

AT-SW, 18H52 midbass and SWANS planar tweeter Discontinued at Jantzen Audio

Test: AudioTechnology 10C77 sandwich cone bass driver. Pre-study for new 3-W project

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Open baffle constructions

OBL-15, the successor of OBL-11, now with the new JA8008-HMQ driver OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB, discontinued. OBL-9, 2009 open baffle construction with JA8008/TW034 and Eminence Deltalite II 2515, 15" bass driver, discontinued. OBL-7, Goodmans Axiom 150 mkII + Supravox 215RTF64 + LE26 dipole panel, OBL experiments.

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Subwoofers

ScanSpeak subwoofer 26W/4558T00-26W/0-00-00, 30W/4558T00-30W/0-00-00 and Hypex FA251/FA501

Hypex FUSION pages for the various constructions where Hypex plate-amp/DSP modules are used.

Hypex FUSION FA501: The Loudspeaker-1 The Loudspeaker-2 The Loudspeaker-3 The Loudspeaker-5 Ellipticor-28 Ellipticor-3 MUN-17 ScanSpeak Subwoofer, 12" SEAS CNO-4

Hypex FUSION FA252 Ellipticor-4 ATS4-HE FUSION-3

Hypex FUSION FA122 Ekta 2D

Hypex FUSION FA251 FUSION-BAD The Loudspeaker-3 SBA-741 + bass module ScanSpeak subwoofer 10"

General instruction on Hypex modules: http://www.troelsgravesen.dk/FA251.htm

http://www.troelsgravesen.dk/FA501.htm

Downloads: Go to page with all Hypex files here (except Ekta 2D)

All Hypex related pages (for my own recollection): Use a Hypex FA251 or FA501 as a power amp for bi-amping http://www.troelsgravesen.dk/The-Loudspeaker-III.htm http://www.troelsgravesen.dk/FUSION-BI-AMP-DSP.htm http://www.troelsgravesen.dk/FUSION-3.htm http://www.troelsgravesen.dk/Hypex-FUSION_FA252.htm http://www.troelsgravesen.dk/ATS4-HE_Ill-4_FA252.htm http://www.troelsgravesen.dk/FUSION-FA122.htm http://www.troelsgravesen.dk/Hypex-PSC2.400.htm (plate amp no longer available) Back to Index

My main system

EAR-MC4, SUT

Tona SUTs for my systems

Rega P8/RB880, various cartridges

Rega P2/RB220, highly modded

Rega P?, RB300, highly modded

van den Hul, The Grail phono stage

Cartridges: Ortofon Anna D Ortofon Windfeld Ti Ortofon Cadenza Black Ortofon 2M Black LVB My Sonic Lab, MSL Eminent EX Also see Vinyl PLayroom and Reganism

Workshop system:

Kuzma Stabi R with 4Point tonearm + MSL Eminent EX cartridge

Yoshino EAR-868PL Phono/Line Stage Preamplifier

Yoshino EAR-861, 32 wpc power amplifier

Hypex Ucd400, 400 wpc digital power amp (for bi-amping when needed)

Parasound A21+ power amp

Tona SUT

EAR-MC4, SUT

Rega P8/RB880, various cartridges

Rega P2/RB220, highly modded

Rega P?, RB300, highly modded

Up-Grade Kits For Vintage Speakers

JBL L100 Century

JBL L112

YAMAHA NS1000M

Tannoy MG15

B&W 802s3, better crossover components and wiring

Should I up-grade my vintage speakers? Read here.

Discontinued as kits from Jantzen Audio, source components locally.

JBL-L26

JBL L36

Dali800 renovation, new tweeter and crossover

Chario Academy Sonnet speaker

Find feedback to kits here

Vintage Loudspeakers

Click heading or image to go to vintage intro

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JBL, James B. Lancing

JBL L112 Up-Grade Kit JBL L100 Century Up-Grade Kit JBL L100 Recreation, new aperiodic cabinet Read L100 upgraders' response to kit JBL LE20 and LE25 tweeters JBL LE26 tweeters JBL L26 JBL L26-3way

TANNOY

Part 1: Tannoy 15" MG Part 2: Tannoy MG15 Upgrade Filter Part 3: Tannoy MG15 Crossover Problem

YAMAHA

YAMAHA NS1000M UP-GRADE KIT

WHARFEDALE

Mail exchange with former Wharfedale employee Wharfedale 1962 brochures Wharfedale SFB, pics and comments from owners Wharfedale Super 8 RS/DD Wharfedale Super 3 tweeters Wharfedale Super 8/FS-AL & North England M8, only pics

Vifa None of the midbass drivers here available, nor any replacements!

PL14WJ-09-08/ScanSpeak R2604/832000, 2-way 11.5 liter bookshelf mini, or 25 liter d'Appolito, can be used for center speaker C17WH d'Appolito: C17-I, C17-II, C17-III, C17-mk4. C17 drivers very hard to find C20WH-07-08 + Monacor DT300/waveguide. C20 drivers very hard to find

High Efficiency Speakers and vintage stuff

High Efficiency Speakers, intro and experiments Supravox full-range experiments in DTQWT cabs Supravox 215GMF tweaking for better performance Müll oder gut für ein Schlechtwetterprojekt? Vintage Isophon P25A Vintage ScanSpeak. W21-3804-P2A and D3804 drivers German SABA greencones, pics, links and some modelling 1955 Karlson Speaker Brochure Sonab OA5 mkII speakers, Stig Carlsson's omnidirectional speaker from the Seventies Test, vintage Snell-E-III Spendor BC1 Philips 9710 Part I-II-III Philips 9710 disassembling Philips AD-0160-T8, world's worst dome tweeter? Blackcones, vintage SEAS 21 TV-G and SEAS 9 TV-LG and resonant boxes Clarion by SEAS, a 1978 classic 3-way from SEAS 25 F-WBX/DD, 11FM (H130) and 1" dome (H107)

SEAS kit 503, the big SEAS 3-way of the Seventies SEAS KIT brochure SEAS KIT 303 crossover Download SEAS brochure (Norwegian) on kits 223, 253, 403, 603 and Disco-47

Goodmans Axiom 150 mkII Goodmans Axiom 150 mkII + Supravox 215RTF64 + LE26 dipole panel (=OB7 article) Dali800 renovation, new tweeter and crossover

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Loudspeakers in general/FAQ/tips/ideas, etc.

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CAPACITORS Super caps, what are they and why are they so expensive? Jantzen Audio, Alumen-Z, test Jantzen Audio, Amber-Z, test Response to upgrade from standard PP caps to super-caps Description of capacitor sound found on the web

Miscellaneous What it takes to make a crossover, - please read before asking for a crossover for your drivers!! Choices, How to pick the right diy speaker project. Size matters. Please read before writing! Placement of port(s) My measuring equipment, books and articles useful for getting started in loudspeaker building High-pass filter for power amps Passive to active? Why not so easy. Time-alignment of drivers. How to determine dZ Inverted polarity, what is it? Find the polarity of your driver Calculation of box volume and ports. Can we calculate box volume at all? Vent tuning, calculation of vent length Tips & Ideas, Glue for crossovers, solder tag strips, flaring plastic vents, damping materials, etc. Edge-coating of drivers Edge-coating and linear distortion, prelude to CNO-GRANDE construction Definition of frequency ranges Bi-amping, what is it? Some hints and tips Room-gain, a case study Measuring inductance of low-DCR coils, like C-coil Use a Hypex FA251 or FA501 as a power amp for bi-amping Inverted polarity, what is it? I'm afraid we need to spend a little time here. Room-gain, a case study Beaming. What is it? Cabinet damping, please check this before writing on cabinet damping Why it's not so easy to make a small mini into a 3-way The importance of chamfering driver holes. A small study How flat is flat? Does a flat frequency response matter? Why my crossover layout may differ from actual schematics. A very common question Room Acoustics. Thoughts from Speakers' Corner with a few added comments Electronic crossovers, pros and cons How female vocals can make your hair turn grey - and can low-order filters do something about it? Speaker cables and interconnects Power handling of loudspeaker systems Large domes, part I. Test of SEAS T35C002, Chario Sonnet, modified Audax TW034, Ciare MT320 and Accuton C30-6-024 domes Waveguide for ScanSpeak D2904/710003 tweeter More on waveguides for ScanSpeak tweeters Eight + one: Can we make a 2-way from and 8" driver + 1" dome tweeter? Wide Baffles, introduction, Stradivari, how does wide baffles impact sound reproduction Study on stepped baffles with little impact on tweeter performance Make your own non-inductive graphite resistors! Tweeter measurements My Panasonic TV, better sound on a weekend Choosing the right point of crossover What is an acoustic vent, aperiodic tuning, Variovent Definition of frequency ranges The importance of wiring crossovers correctly ScanSpeak Classic 9500, 9700 and 9900 tweeters, why they are not interchangeable Shipping speaker drivers Fountek ribbons Fountek JP3 ribbon replacement, pdf file. Links to other sites: Want to hear what your cabinet panels sound like?

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Reviews/tests

Test, vintage Snell-E-III Testing PA midrange-drivers for hifi Test ScanSpeak dome tweeter, D3004/602200 Ortofon T5000 SUT Thöress EHT Integrated amplifier. Can you handle the truth? QUAD ESL-63 Test Audio Technica ART1000 cartridge Testing ScanSpeak D2104/712000 3/4" dome tweeter Testing new Jantzen Audio AMBER-Z-CAP Testing SBAcoustics SB29BAC-C000-4 Be dome Testing EAR Acute Classic CD-player/DAC Testing new ScanSpeak Ellipticor 21WE/4542T00 midbass driver Testing BlieSMa T34B-4 Beryllium dome Testing new T34A-4 34 mm dome tweeter from BlieSMa Testing ribbon tweeter, Viawave GRT-145W-8.htm Testing ribbon tweeter, Viawave GRT-145-4 LCR RIAA shoot-out, EAR-912 vs vdh The Grail vs Valab LCR-1 Testing EAR 912 preamplifier with phono-stage Testing Alumen Z-Caps from Jantzen Audio, a new foil capacitor Testing Audio-gd pre-amp/headphone amplifier NFB-1AMP Test ATC SM75-150 midrange dome Test of ScanSpeak D3004/604010 Be domes Test of two ScanSpeak ring-radiators, R3004/662000 and R3004/602010 SAC Thailand GlowMaster KT 88 fully balanced power amp Test of van den Hul The Grail phono stage Large domes, Test of SEAS T35C002, Chario Sonnet, modified Audax TW034, Ciare MT320 and Accuton C30-6-024 domes ScanSpeak tweeters, D3004/660000 and D2904/710003, D3004/6640 Beryllium dome and D2908/7140 Beryllium dome Test of DiyHiFiSupply EZ line stage Test of MANGER MSW transducers Norwegian Wood, review of MAE1, Single Ended Tetrode Amplifier Kit from Norway Review of vintage Snell A3i loudspeaker Chario Academy Sonnet speaker Jungson JA88D-09, 2 x 80 watt class A solid state amp - or at least some of these watts in class A ... Jungson Duro power amp Garrard 401/LINN - Thorens TD124 mkII/Jelko shootout! Test of Lowther EX3

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Main System

Kuzma StabiR turntable, Kuzma 4Point tonearm + Ortofon Anna D cartridge

Cartridges: Ortofon Anna D Ortofon Windfeld Ti Ortofon Cadenza Black Ortofon 2M Black LVB My Sonic Lab, MSL Eminent EX

Tona SUTs for my systems Also see Vinyl PLayroom and Reganism Yoshino EAR Acute Classic CD-player/DAC Yoshino EAR-912, pre-amplifier, line-stage/phono stage 2 x Yoshino EAR-861, 64 wpc bridged power amplifiers Parasound A21+ power amp

Speakers:

ScanSpeak Ellipticor-28

ScanSpeak Ellipticor-84

ScanSpeak Revelator-851

WORKSHOP SYSTEM

Kuzma Stabi R with 4Point9 and 4P (11) tonearms + MSL Eminent EX cartridge

Tona SUTs for my systems

EAR-MC4, SUT

Rega P8/RB880, various cartridges

Rega P2/RB220, highly modded

Rega P?, RB300, highly modded

Yoshino EAR-868PL Phono/Line Stage Preamplifier

Yoshino EAR-861, 32 wpc power amplifier

Hypex Ucd400, 400 wpc digital power amp (for bi-amping when needed)

For most larger speakers I use bi-amping, Hypex Ucd400 or Hypex FA501 for the bass and EAR-861 for mid-tweeter. Go to bi-amping here to see what bi-amping looks like. Bi-amping means you have a line-stage, a pre-amplifier, driving two power amplifiers, which each runs either bass or mid-tweeter. This requires the crossover is separated in bass section and e.g. mid-tweeter section. Bi-wiring means you have the same amplifier connected to bass and mid-tweeter with separate speaker cables. It also requires the crossover to be separated in sections for bass and mid+tweeter.

Miscellaneous

My living room rack

High-pass filter for power amps

BI-AMPING: WHAT IS IT?

Speaker cables and interconnects A few formerly owned components:

van den Hul, The Grail phono stage Ortofon ST-80 SE, SUT The Vessel B3SS cartridge Denon DP67L Shanling 2.1 CD player QUAD-2812 (I didn't have the space..missed!) Yoshino EAR-869, integrated/power-amp SAC GlowMaster KT88 PP, fully balanced power amp Jungson JA88D-09, 2 x 80 watt class A solid state amp Maglev turntable, SME 309 GD tonearm, My Sonic Lab Eminent EX cartridge Shanling CD-T80 CD player DAC: Musical Fidelity DAC M1a 6N6P line stage with output transformer 2017, renovating two Lenco L75 decks Lenco L78/Moerch DP6 9" Precision tonearm, vdh Canary cartridge Lenco L75 + Moerch 12" tonearm, vdh Colibri cartridge Lenco L75, Jelko 12" tonearm van den Hul Canary cartridge van den Hul Colibri cartridge Project RPM4 turntable, rebuild Phono stage based on Transcendent RIAA schematics Jungson Hedo/Duro power amplifier, the power amp section of the Jungson JA88D-09 Einstein The Amp Garrard 401 turntable/Jelko 750D 300B, 8 wpc SET integrated amplifier Audio Mirror, Vladimir Bazelkov's 6AS7 PSE, 20 wpc mono blocks, rebuilt to 6C33 tubes Thorens TD124 mkII/Jelko Transcendent Grounded Grid line stage Transcendent Phono Stage Audio Research SP16L Copland CTA 505 Numerous LCAudio power amplifiers DACT line stage Numerous home-made valve line stage amplifiers Luxman MQ70 (EL34) power amplifier Numerous Erno Borbely MosFet power amplifiers Danish High Fidelity magazine preamplifiers, MC, phono and line stages

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SPONSORS

Click logos to go to websites

Crossover components found on this website are sponsored by Jantzen Audio. Jantzen Audio has the most extensive range of baked coils available, supplemented by a wide range of audio grade capacitors. In addition to this a wide selection of components for speaker building.

Complete crossover kits for the shown constructions can be ordered at: [email protected]. For SEAS, ScanSpeak, SBA, Purifi and some AudioTechnology constructions, this can include drivers as well. I'm particularly grateful to Jantzen Audio for taking the financial risk of launching the JA8008 and JA8008-HMQ drivers. Without their support these drivers would never have been made.

Some of the drivers used in the constructions were sponsored by Jantzen Audio (SEAS drivers), ScanSpeak, AudioTechnology and SBAcoustics. Thanks to those who made this possible! Without your support only a few constructions would have made these pages.

None of the constructions shown at my website were suggested by any of my sponsors (Except for MUN-17, Ellipticor-1 and Ellipticor-A50) and I'm not financially affiliated with any of my sponsors. For questions regarding the constructions on this site, please contact me at: [email protected]

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