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Old 13th November 2003, 05:37 PM   #11
JCoffey is offline JCoffey  United States
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Default Re: got a free amp, let's build me a sub!

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Originally posted by cowanrg
ok, so i came across a free velodyne subwoofer plate amp (from an HGS18, 1250W RMS, 3000W peak), and i want to use it to build a sub. ive never done a sub before. i just need something to augment my other one. size is slightly a factor (nothing like 4' x 4'), but a good sized cube (2'x2') is fine.

I have a better idea. Sell me the amp for $50 and it'll solve both our problems....

Drool 1250 watts RMS to play with. God the mind reels at the ideas........
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Old 13th November 2003, 05:41 PM   #12
cowanrg is offline cowanrg  United States
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honestly, i almost lost sleep last night over it! for not much green, i could easily build a kick *** sub! if i could just get some help on what to do
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Old 13th November 2003, 06:33 PM   #13
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Doesn't the Velodyne HGS-line use servo feedback? The Velo subs I've seen have an accelorometer bonded on the rear of the cone which provides a feedback signal to the amp to linearise the output.

I'm not sure how the amp would respond if the feedback signal was missing.... Suggest you try it before you splash out the cash on a new driver!

Nice one,
David.
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Old 13th November 2003, 06:37 PM   #14
cowanrg is offline cowanrg  United States
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this one does not have an accelorometer. its just two leads that run to the sub.
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Old 13th November 2003, 06:44 PM   #15
JCoffey is offline JCoffey  United States
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What about 4 12" Titanic subs in an enlosure or infinite baffle......
God that would be incredible........................
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Old 13th November 2003, 06:46 PM   #16
cowanrg is offline cowanrg  United States
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those are pretty expensive right? that might kick me over my budget :-)

i was reading the di-pole subwoofer thread, and was thinking of maybe 4 of those 12" pyle drivers. im REALLY trying to keep this project under $200.

and keep in mind, the room already has a sub that will do 20hz at around 110dB... this is just "in addition to" that one
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Old 13th November 2003, 06:59 PM   #17
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This is what you do. IMO of course.

The best sounding bass I have ever heard is from a dipole. If your budget is $200.00 Go to parts express, and get two of the 15" quattro woofers.

http://www.partsexpress.com/pe/pshow...=295-560&DID=7

Put them in a W-Frame Dipole with a depth of about 24 inches if you can. You will also have to adjust the height and width to suit the 15" drivers. That is described here:

http://www.linkwitzlab.com/woofer.htm

Cross it 4th order at 90Hz to your mains, and 4th order at 40Hz to your other sub. Put your other sub as tightly into a corner of the room as possible (it is only there to operate below all room modes). The dipole sub should be placed between the mains with at least 4 feet of open air behind it. One of the open ends should face you.

Oh yeah, and if that other sub you have isnt sealed, seal it quick if you are looking for the best bass response.

Again, all in my opinion.

Have a good one,
Paul Hilgeman
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Old 13th November 2003, 07:10 PM   #18
Bull is offline Bull  United Kingdom
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As your on a low budget and the amp is 1250w rms then get 2 Eminence Delta 15 LF or 2x Eminence Delta 12 LF [the LF versions are rated 600w rms and they are suitable for subwoofer use]
www.eminence-speaker.com
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Old 13th November 2003, 07:54 PM   #19
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If you want some fast bass in the 60hz and up region....I would go with multiples of 10" or 8" for that matter......that way you can keep the cabinet small and get some good punch
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Old 14th November 2003, 03:08 AM   #20
Guss is offline Guss  Canada
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Quote:
Originally posted by JOE DIRT®
If you want some fast bass in the 60hz and up region....I would go with multiples of 10" or 8" for that matter......that way you can keep the cabinet small and get some good punch

Yeah, as in many bass guitar amp. 4X10'' or 8X8'' in a HUGE closed box. As this one from ampeg, what a sexy setup! One day I'll replace my fridge with this kind of thing
Click the image to open in full size.
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