Paradox In HIVI M4N's Qts. - DiyAudio

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  • Thread starter Thread starter bigcatdairy
  • Start date Start date 2011-07-06 4:30 pm
Status Not open for further replies. Jump to Latest B

bigcatdairy

Member
Joined 2005 Ladies(if there is any🙂 & Gentlemen: I've got a pair of HIVI M4N and wanna build a pair of sealed box, but when i input the parameters into winISD then I've got a 121l of box volume, it seemed something wrong, I input the params into a web calculator, I got negative box volume, is there anybody can tell me why? BTW: I think those results were caused by the Qts which as 1.08, is it wright? what can I do for calculate the correct box volume? Any feedback will be great appreciated, thanks for reading. FYI: HIVI M4N: http://www.hiviresearch.com/driver/htm/buglelist.php?type=11 Web cauculator which gave me negative box volume(not the calculator's fault): Speaker Box Calculations S

sreten

R.I.P.
Joined 2003 Hi, You will get a negative box volume if driver Qts is higher that the box Q target. with a Vas of ~ 4.5L your looking at a sealed box around 6L or some pretty wacky vented alignments up to 9L. Typical calculators go for Qbox of 0.7, your looking at =1.4 6L, =1.3 9L. TBH there not a lot of real difference between the two, both bass peak. 6L sealed gives you a 3 dB hump around 100Hz. 9L vented at 50Hz gives loads more bass and will probably works best as a power handling alignment combined with the 80Hz setting of an AV amplifier (small). Without AV a bass bump can compensate for no bass lower down. rgds, sreten. B

bigcatdairy

Member
Joined 2005 HI Sreten:
sreten said: Hi, You will get a negative box volume if driver Qts is higher that the box Q target. with a Vas of ~ 4.5L your looking at a sealed box around 6L or some pretty wacky vented alignments up to 9L. Typical calculators go for Qbox of 0.7, your looking at =1.4 6L, =1.3 9L. TBH there not a lot of real difference between the two, both bass peak. Click to expand...
for here understood, so can i ask you what sounds different for a speaker system at a 0.7 and 1.x in Qtc? And here can i do anything to reduce the Qtc down to 0.7 for the enclosure? Wht the manufacturer design those drivers on such a high Qts? What's the advantage of such a high Q drivers?
sreten said: 6L sealed gives you a 3 dB hump around 100Hz. 9L vented at 50Hz gives loads more bass and will probably works best as a power handling alignment combined with the 80Hz setting of an AV amplifier (small). Without AV a bass bump can compensate for no bass lower down. rgds, sreten. Click to expand...
Unfortunately i don't have any AV amp, i drive my bookshelves on a DIY LM1875 amp. Thank you very much for your reply🙂 S

sreten

R.I.P.
Joined 2003 Hi, The easiest way of making a high Q driver is taking a decent driver and fitting it with an undersized magnet, its cheap and cheerful. I suspect the driver is developed for HT systems. Used as a mid only the bass peak would be less troublesome. The B4N seems a decent driver, but needs a clever crossover : https://sites.google.com/site/undefinition/diy-overnightsensations One approach would be undersize your amplifiers input capacitor, set it for 100Hz, i.e. -3dB at 100Hz. This would combine with the driver to be flat to 100Hz, and then a 3rd order roll-off below that, but you ideally need a sub for real bass. rgds, sreten, Last edited: 2011-07-07 1:13 pm B

bigcatdairy

Member
Joined 2005 Hi Sreten: please tell me undersize to what criteria? undersize to the suggested 5l box? or what? and the like you quoted was unreachable here, was it hivi b4n? thanks. S

sreten

R.I.P.
Joined 2003 Hi, At Parte Express the B4N is the same price as the M4N and seems in all respects a better choice than the M4N, especially regarding published designs for it. Compare the weights of the 2 drivers, the M4N must have smaller fitted magnets. The tricky c/o used on the B4N implies something similar is needed for the M4N. M4N : http://www.parts-express.com/pdf/297-434.pdf TBH if building something I'd bite the bullet and go for the B4N, lower Fs, lower Qts, higher sensitivity (+ 3dB) all add up to a much better driver. Both drivers need clever work in the crossover to work properly. rgds, sreten. B

bigcatdairy

Member
Joined 2005 Sreten: Thank you very much for your advise, I'll try accordingly. have a nice weekend. B

bigcatdairy

Member
Joined 2005 Sreten: Thank you very much for your advise, I'll try accordingly. have a nice weekend. S

sreten

R.I.P.
Joined 2003 Hi, I have to repost : https://sites.google.com/site/undefinition/diy-overnightsensations Lots of information ; Lots of options ; Great $24 cabinet options ; You can't go wrong. Even on PE there are loads more actually useful files on the B4N for rolling your own. The c/o is so tricky for both IMO you might as well give up on the M4N, go for the B4N. In terms of time, effort, confusion and being happy I highly recommend this action. rgds, sreten. Last edited: 2011-07-09 3:08 am Status Not open for further replies. Share: Facebook X Bluesky LinkedIn Reddit Pinterest Tumblr WhatsApp Email Link
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