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5th December 2009, 03:19 PM
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#1 |
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diyAudio Member
Join Date: Sep 2006
Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
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MTM, Two woofer formula?
I want to design an MTM "tower" with two 15" drivers & a horn in the middle ala DeAppolito type.
I came across this driver, 15",Fs=42Hz,Vas=8.6cu FT, Qms=4.73, Qes=.44, Qts=.4, Db=101.6 @1W1M, I ran the formulas & came up with Vb=9.3004...., F3=39.385...., Fb=40.238.... The thing I don't have is the formulas for twin drivers in a tuned box. Is there a hard formula for dual/multiple drivers? The application is for a very low powered tube amp......I'm shooting for 104+ Db response. I know it can be done, I've just come to this impasse. __________________________________________________ _________Rick...... |
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5th December 2009, 03:37 PM
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#2 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Just double box volume and use two ports as they would be in a single box.
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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5th December 2009, 03:44 PM
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#3 |
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diyAudio Member
Join Date: May 2005
Location: Californication
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You can use the same formula for 2 identical drivers using T/S for the single, with the only difference being Vas is doubled. Your tuning of Vb~1/2(2*Vas) is about right for the double.
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like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust |
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5th December 2009, 04:32 PM
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#4 |
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diyAudio Member
Join Date: Mar 2005
Location: UK
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For modelling purposes, if the twin drivers in parallel, Sd & Vas effectively double compared to the single unit, while Re & Le are halved. If the twin drivers are wired in series, then Sd, Vas, B*L, Re & Le all nominally double compared to the single unit.
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