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Originally Posted by 302exploder
so let me see if i got this right: the impedence of the sub doesn't have to match the impedence of the amp. so i can have a dual 4 ohm voice coil sub and run it off an amp at 2 ohms? and a sub with higher impedence will pull more power from an amp?
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Correct, a dual 4 ohm sub wired in parallel can be run off an amp at 2 ohms. However, a higher impedance will pull less power from an amp... a lower impedance will pull more power from an amp.
Take a look at the power ratings on this amp:
http://www.drdetailshop.com/d1100d.htm
It does 425 x 1 @ 4 ohms, 800 x 1 @ 2 ohms, and 1100 x 1 @ 1 ohm.