The issue...I had a 5.1 Home Theatre in a Box speaker set that was of good quality (made by a company that specializes in speakers) that had a built in receiver/amplifier.  This system worked fine for several years until I got a new 7.1 receiver.  All of the other speakers from the system hooked up as you would expect to the new receiver, except for the subwoofer.  Seems that today's surround receivers require a powered subwoofer as part of the system.  The subwoofer from the HTIB was in perfect condition and sounds fine as is, so the solution became to add a separate amplifier to drive it.


Step 1: Remove back of subwoofer

My sub had the receiver/amp built in to the back of it.  I removed these parts since they weren't being used and found the two (+ and -) wires to the speaker.
<p>Just use this amp http://www.amazon.com/gp/product/B0049P6OTI/ref=oh_details_o00_s00_i01?ie=UTF8&amp;psc=1 its awesome I have one hooked up to a 5.1 receiver. took the sub out from the receiver to the left input channel of the amp and wired up the left out from the amp to the left input of the sub and boom your done. lil amp packs a punch</p>
Awesome, I'll be doing this to my old Radioshack passive woofer when I move my home theater into the basement. Since the under floor there is concrete I am thinking there won't be as much vibration felt through the floor like it currently is. I figure a pair of powered woofers (one came with the current steroe) should transfer a lot of rumble into the furniture to compensate.
Thanks for sharing, this is what I was looking for.
Thanks for this. I have upgraded my surround receiver to get more HDMI inputs and found my older passive sub would not work either. I will be ordering the plate amp and doing this too.
&nbsp;I think I'll do this with an old subwoofer I have<br />

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