I'm completely new to this electricity stuff. Last night I hacked a pair of old computer speakers into an amp. Just clipped the input wires where they came in the back of the powered speaker and soldered them to a jack. Works fine, but very little volume. Is there any additional hack which would improve that any? Simple piezo pickup in an acoustic instrument.
Piezo/Mag pickups don't kick out as much juice as the line-out from the computer, so yes the volume is less, but pat youself on the back, it worked!
Unless you were using a mic level input on the old receiver, its likely you could still get even more volume with a preamp bringing the signal to line level.
I have a 2x100 Watt stereo board wired up that expects line level - play a song from my phone I can't turn the volume all the way up without worrying about my hearing.. Plug in my lil guitar and try to turn it to '11' and you can almost hear crickets amplified with the weaker signal..