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Old 19th October 2004, 06:36 PM   #1
Swanic is offline Swanic  England
diyAudio Member
Join Date: Oct 2004
Default helping a first time builder

i am making a scoop sub speaker, as part of my a-level DT project. I have plans for the cabinet, however i need help with the electronics and parts. The speaker will we connected to my 130w amp, and will be for my personal use in my home. I am wondering if anyone could suggest a suitable bass cone (around 12'', costing under 80), and could anybody help tell me what other parts i need, and how i would connect it all.
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Old 19th October 2004, 11:18 PM   #2
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi, have you investigated Thiele Small parameters yet?
Find a speaker designer website and start plugging in some numbers before you even think about a box. When you have sourced your driver with a suitable Fs and Qt for your chosen frequency range, then & only then start your box design and construction. You can start design of the electronics now, could this also be part of your project? I suggest a 2pole lo pass and hi pass filter system but you could try 4 pole, only a few extra components. Choose cheap now, once you have passed then you can think about improvements. You'll need a psu for the filters (more research & design!!) & then a box(plastic or metal) to make it safe.
As for connections; source>preamp (passive?)>filters> power amplifiers>Bass spkr & full range speaker (or satelite).
good studying & regards
Andrew T.
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Old 20th October 2004, 09:36 AM   #3
dangus is offline dangus  Canada
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Join Date: May 2004
Location: Vancouver Island
Properly, whoever designed the cabinet would have designed it around a specific driver, or at least for drivers with certain attributes. Did your plans by any chance come from the Eminence "High Power Loudspeaker Enclosure Design and Construction" book. (published by Adam Hall in the UK). The 12" scoop bin in the book is about 7.6 cubic feet, and the recommended drivers are EM 12/100CT, EM 12/100, EM 12/150, or EM 12/200. Those model numbers are long obsolete, but they'd be paper cones with accordian surrounds, with power ratings from 100 to 200 watts. So, check out your local Eminence dealer(s) and see what fits your budget:

This probably won't be a great subwoofer; the response graph in the Eminence book drops off below 90 Hz (50 Hz is 10 dB down from 100 Hz).

Now, if the plans are for the "Live Audio Board" LAB sub designed by Tom Danley, you'd need to use the driver that was designed for it, but you would get some very worthwhile bass out of it.
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