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Old 27th July 2003, 06:22 PM   #1
Street is offline Street  Canada
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Default Subwoofer amping question

I'm considering building a subwoofer however I have a few questions about possible ways to power it. I have a 5-channel surround amp and I'm only using 2 of the channels. I was considering the possibility of using a dual voice coil woofer and powering it with 2 of the unused channels on my amp. This then brings me to my problem of a x-over. I would like to have an adjustable low pass filter to allow easy matching to my main speakers and there future upgrades. I could build a passive x-over however this might require replacement with a different set of speakers. Also, I believe the inductor would have to be quite large and therefore expensive.

Is there a good and relatively cheap way to x-over the sub or am I better off investing in a sub plate amp? If the plate amp is the best way to go, could you recommend a good plate amp or kit?

-Street
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Old 29th July 2003, 02:20 AM   #2
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I bought two 500 watt amps for real cheap. They have a 36 or 24 db-slope LP x-over fixed at 100 Hz. But now I don't need them cause I have no room for subs. So you could get sub amps from me really cheap, but the 100 Hz fixed LP x-over is probably unacceptable for your application.

I'm going to wind some large inductors tomorrow. If you know where to get magnet wire for winding inductors I can tell you where to get cores that you can wind them around relatively easily and made out of the proper material for the application, alphacore.com they're called o-cores. Don't know what slope you want if you wind an inductor you might want to throw in a cap for a 12 db-slope. You would need two inductors and 2 caps for each voice coil though. Probably a lot of work for nothing.

Don't know where you can get sub amps cheap all the ones I've seen are really expensive except for the ones I bought, which are designed to power a 15" sub that goes inside a 315HO acoustic research speaker.
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Old 30th July 2003, 06:42 PM   #3
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Does your amp include pre-amp outs? If not, does the tape2 in/outs affect all channels? In some receivers the tape loop only affects the front chan. amps. If this is the case you could use the front chan. amps for your sub by strapping a cheap high impedance lo pass filter in the tape loop.
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