Re: amp for speakers and sub
4 channel amps come with separate settings for channel 1&2 and 3&4. So your front speakers would go on channels 1&2 and would have the gain set a certain way. Then channels 3&4 would be bridged and have a certain gain setting for the sub. The two gains are completely independent of each other.
Originally Posted by bradl79
Like the other guy said, it's never bad too have an amp that is too powerful. You will just have to set the gains lower than you would on an amp that puts out less power. And if you do use an amp that can put out too much power, you will have better sound quality because it will not have to work as hard (so that means less THD (total harmonic distortion) and a better signal to noise ratio).
On the other hand, an amp that puts out not enough power to your speakers (say they are rated to take 75 rms and the amp does 55 rms to each channel) will be the limiting factor in your system and when you push it past it's limit it will clip the signal and ruin your speakers.
2000 Volvo v70
HU: Pioneer MVH-8200bt
Front Stage: Focal IS-165
Sub: Alpine Type-R 12"
Speaker Amp: Polk PA660 bridged to 150x2wrms
Sub Amp: Alpine MRX-M50
Sub Box: Custom, tuned to 33Hz