d b
never seen an amp beyond a 6 channel. Just do dual 4 channel amps

RJ
I've never heard of an 8 channel amp. the most I've heard of is 5. Thats not to say that there is no such thing as an 8 channel amp, but if there is one it can't be very common. If you wanna wire all of the speakers in your car to an amp, then you need a 4 channel amp. you can hook up each of your 4 stock speakers to a channel. if you have more than 4 speakers then you can wire more than one speaker to a channel. If you want to wire just a subwoofer, or subwoofers then you will want a mono amp or a 2 channel amp. either works fine. now if you want to wire all of your car speakers and subwoofer/s to just one amp then you can use a 5 channel amp, which is basically a 4 channel amp with an added channel that has extra power for subwoofers. 5 channel amps aren't very common either though and the only one I know of is a memphis amp the belle I think. anyways if you really believe you need 8 channels then you will probably have to get two 4channel amps

conejote_99
yes you can find 8 channel amplifiers from ads,digital the old jl audio from the early 90'2 phoenix gold this is the one i like the best 8 channels can be bridge to 4 channels

twiztid.mafia
LMMFAO 8 channel amp that big and the rms wattage is only 40 watts....wow, look man, if you really want the 8 channels, everyone is right, get 2 four channel amps, best bet, honestly tho, i dont see why you need a 8 channel amp, if after having an amp powering your subs, and if your subs over ride your stock speakers, you need to upgrade your system, not buy a amp.