I found this and thought it was SUPER helpful and interesting! It's how to properly tune your amp with a Multimeter!
So you're going to need..
the MM
a 50hz test tone:
http://www.bnoack.com/index.html?htt...downloads.html
Burn your tone to a CD, mp3 player, etc. Then head out to your car.
Unhook the woofers from the amp. Make sure your know what impedence you're running at the amp (2 ohm, 1 ohm, 2.66 ohm, etc), if you're not sure, disconnect the woofers, and use your MM on the ohms setting to measure the wires where they would plug into the amp (on the woofer side of course), and whatever you get, that's your impedance.
Next it's time to do math. You're going to be using the equation P=(V^2)/R.
P=watts, you pick the number, let's say you want 1000watts powering your subs.
R=resistance.. or impedence, this is the ohm load your subs are wired at.. lets say 1 ohm on a monoblock amp
V= voltage (AC), this is what you're going to be measuring in a second, but first you need to find what you're looking for
So plug it in and solve 1000= (V^2)/1ohm...
and get V = 31.6 V(ac)
Now, fire up your audio system (woofers still unplugged), turn it up the loudest you plan on having it on any given day (volume and bass EQ), and play the 50hz test tone.
Run back to your amp, set the multimeter on V(ac), and measure from the two outputs. Adjust your gain until you're at 31.6V.
Woo! Now you'll be giving woofers on a 1ohm load exactly 1000watts. This works for any setup, just math it all out and then tune.
Hope someone else found this interesting, just figured I'd share.
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