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Old 11th January 2008, 03:18 PM   #1
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Default 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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Old 12th January 2008, 05:00 PM   #2
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Greets!

Have you considered a tapped horn?

GM
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Old 12th January 2008, 08:28 PM   #3
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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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Old 12th January 2008, 10:49 PM   #4
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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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Old 12th January 2008, 10:50 PM   #5
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Old 13th January 2008, 06:32 AM   #6
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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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Old 13th January 2008, 03:33 PM   #7
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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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Old 13th January 2008, 03:35 PM   #8
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