I have a pair of speakers that have mismatched woofers, it's a long story and I will spare you all. The newer woofer is 8 ohms and the older woofer is 4. I'm planning to replace both, however in the mean time, if I add a 4 ohm resister to the + side of the 4 ohm speaker will my impedance become 8 ohms? My second question is whether I should even bother, my amp doesn't seem to have a problem running the two, I have one of those Yamaha 2500's, and it hasn't tripped the breaker... yet.

Any opinions appreciated.