How To Determine The Crossover Frequency - DiyAudio

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You are using an out of date browser. It may not display this or other websites correctly.You should upgrade or use an alternative browser. How to determine the Crossover Frequency
  • Thread starter Thread starter Desturo
  • Start date Start date 2017-04-15 10:50 am
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Desturo

Member
Joined 2017 Hello everyone, I just planned my first speaker build. Its a stereo stetup with a woofer and a tweeter on each side. The drivers I want to use are: Tweeter: ND16FA-6 6 Ohm 3.5kHz-27kHz Woofer: RS75-4 4 Ohm 170Hz-20kHz The amp I am planning to use is the LEPY LP-VS3 with 2x25W. Now I need to calculate the values for the inductors and Capacitors. I tried to use the calculator on this site: https://www.diyaudioandvideo.com/Calculator/SpeakerCrossover/ but it asks for the Crossover Frequenzy. So How do I get the Crossover Frequenzy for my Speakers. Thanks Nico D

Desturo

Member
Joined 2017 Just changed the Amp I want to use now I am considering the DTA-2 S

Scott L

Member
Joined 2008 Paid Member Hope this helps: Resources A

AndrewT

R.I.P.
Joined 2004
Desturo said: Hello everyone, I just planned my first speaker build. Its a stereo stetup with a woofer and a tweeter on each side. The drivers I want to use are: Tweeter: ND16FA-6 6 Ohm 3.5kHz-27kHz Woofer: RS75-4 4 Ohm 170Hz-20kHz The amp I am planning to use is the LEPY LP-VS3 with 2x25W. Now I need to calculate the values for the inductors and Capacitors. I tried to use the calculator on this site: https://www.diyaudioandvideo.com/Calculator/SpeakerCrossover/ but it asks for the Crossover Frequenzy. So How do I get the Crossover Frequenzy for my Speakers. Thanks Nico Click to expand...
Look at the frequency response of the two bare units. Find a frequency range for each. See what the two units look like in the range that overlaps. Decide on a suitable crossover frequency that minimises the worst of the frequency response anomalies in that overlap range. Now using that frequency, calculate the basic filter components for the low pass 4ohms bass/mid driver. Using the same frequency, calculate the basic filter components for the high pass 6ohms treble driver. Note you MUST use a mixture of 4ohms components in one filter and 6ohms components in the other filter. D

Desturo

Member
Joined 2017
Now using that frequency, calculate the basic filter components for the low pass 4ohms bass/mid driver. Using the same frequency, calculate the basic filter components for the high pass 6ohms treble driver. Click to expand...
Where can I calculate those values? Can I use the calculator wich I linked in the original post? And if I can which order should I take. And I sattled for a Crossover frequency of 8.5kHz will this work? Flaesh

Flaesh

Member
Joined 2009 You can download FRD/ZMA Data Files for Daytons and use Xsim crossover design and simulation program.. A

AndrewT

R.I.P.
Joined 2004 I have never designed a passive crossover. I guess any of those roll-off cirves would suit. I would try a 2pole L-R as a first stab at something. Your 8k5Hz seems very high. Can your Bass/Mid even reach 8k5Hz? How well does it reproduce to an octave above your 8k5Hz? Even a 2pole Butterworth will pass a large amount of energy to the bass/mid in the octave above the theoretical cross-over frequency. D

Desturo

Member
Joined 2017 I downloaded Xsim but to use it I need the values for the inductors and capacitors wich I want to calculate. D

Desturo

Member
Joined 2017
Your 8k5Hz seems very high. Can your Bass/Mid even reach 8k5Hz? Click to expand...
Yes it can. On the spec sheet it says it can reach to 20kHz. And I dont really understand what you mean with reproducing an octave above 8.5kHz because I'm very new to this topic and don't know very much about it. D

Desturo

Member
Joined 2017 Overthought my desicion and went with 3kHz Corssover Frequenzy Pano

Pano

Moderator
Joined 2004 Paid Member
Desturo said: I downloaded Xsim but to use it I need the values for the inductors and capacitors wich I want to calculate. Click to expand...
No, that's what Xsim does for you. 😀 D

Desturo

Member
Joined 2017 where can I calculate them within Xsim Pano

Pano

Moderator
Joined 2004 Paid Member What you normally do is load a module. Go up to the top and look for CircuitBlocks. You choose High Pass, Low Pass or a Notch. Drop in a high pass for your tweeter, a low pass for your woofer and connect them between your speakers and the amp. Volia! At the moment, it's always 2nd order filters - a coil and a cap. There is a dialog that opens asking you for the crossover frequency and some other things. Just set the frequency to what you need. When the circuit block is loaded, it's a block. You can right click and tune it with the same dialog that opened when you placed it. If you want, you can split the block apart to change or eliminate parts. Give it a try, it's easy! M

Mario Pankov

Member
Joined 2007 You need to place the speaker drivers to the left and connect them to the source with lines. Then you add crossover components to suit. See the example I made for you.

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  • Example.jpg Example.jpg 340.5 KB · Views: 296
Pano

Pano

Moderator
Joined 2004 Paid Member Yep, just like that. Here is an example with 2nd order blocks.

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  • Xsim example.png Xsim example.png 15.3 KB · Views: 289
D

Desturo

Member
Joined 2017 1.: Wich is better second or first order or what are the preferences of each? 2.: If I choose circuitbolcks 2nd Order Q Filter it asks for a Q value. Wich should I take? I have Qm,s Qes and Qts on my spec sheet. scottjoplin

scottjoplin

Member
Joined 2015 The RS75-4 is a 3" full range driver not a woofer. There doesn't seem much point using a tweeter with it, but if you want to your high xover point is a good idea. I would use 2nd order butterworth or LR. A first order may not give enough protection to the tweeter depending on the frequency D

Desturo

Member
Joined 2017 I tried out a 2nd Order Crossover and used Qst. Does it work like this?

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  • 2nd_Order.png 2nd_Order.png 131.6 KB · Views: 263
D

Desturo

Member
Joined 2017
scottjoplin said: The RS75-4 is a 3" full range driver not a woofer. There doesn't seem much point using a tweeter with it Click to expand...
Yes I know it is a Full range driver but I didn't find a Woofer that fits in my Budget and has the right dimensions. And my Xover is quiet high with 3.5kHz.......atleast I think it is. D

Desturo

Member
Joined 2017 And it does fall of quiet a bit in the higher frequencys

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  • RS75-4.png RS75-4.png 229.2 KB · Views: 233
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