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11th January 2008, 03:18 PM
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#1 |
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diyAudio Member
Join Date: May 2004
Location: UK - Bristol
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Sub project ideas
Hi,
Im in need of some ideas for a new subwoofer project. Currently i use a bkelectronics monolith driver in a 95l ported cab tuned to about 20hz, this is a very nice sounding subwoofer but i want to design something new and better. What i have to work with is 2 monolith drivers and an undecided plate amp. What im stuck on is a trying to design a good subwoofer that will ustilise the monolith drivers the best. Specs of the drivers: Impedance: 4 Ohms Re: 3.7 Ohms Le@1kHz: 1.30mH Fs: 23.5Hz Qms: 2.73 Qes: 0.416 Qts: 0.361 Vas: 61.6 L Mms: 232g Cms: 0.35 mm/N Sd: 468.7 Cu Cms Bl: 17.46 T-M Xmax: 15mm So any one got any ideas of what box or tube would be good for 2 of these drivers? atb, Greg |
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12th January 2008, 08:28 PM
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#3 |
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diyAudio Member
Join Date: May 2004
Location: UK - Bristol
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Hmm never thought about a tapped horn but it does look intertesting. I dont know alot about tapped horn so i have a few questions.
What sort of extension could i expect using two of the monolith drivers in a tapped horn? Are tapped horns extremly big? atb, Greg |
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12th January 2008, 10:49 PM
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#4 |
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diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.
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Greets!
Check out the big tapped horn thread: Collaborative Tapped horn project Anyway, with this driver it's not small by most folk's standards and of course with two it's somewhat larger, though not the 2x it would ideally be if sealed or ported: 14.14 - 112.98 Hz conic TH = 329.104 L net 14.14 - 112.98 Hz conic TH - dual = 451.112 L net Compared to my mid '50s dual 15" ~566 L EBS 'subs' that peak out at ~109 dB/16 Hz corner loaded, the dual driver one is by far the size/performance winner, with so much dynamic headroom you can EQ it flat to ~12 Hz if corner loaded and still do DD/DTS reference with enough dynamic headroom above ~25 Hz to boost EQ as much 'slam' into it as you can stand if you want to assuming a suitable amp capable of driving them to Xmax. Short of downsizing, this could be the last sub you'll ever need.  GM
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Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents. |
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13th January 2008, 06:32 AM
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#6 |
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diyAudio Member
Join Date: May 2004
Location: UK - Bristol
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What sort of headroom and extension would be lost of i would decide to go for the smaller single driver design?
Thanks for the info on tapped horn's GM. Cheers, Greg |
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13th January 2008, 03:33 PM
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#7 |
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diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.
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Greets!
You're welcome! On average you'll lose 3 dB of efficiency and 3 dB of sensitivity and the response isn't as flat due to the too small net Vb for the BW. GM
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Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents. |
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