dear it depends...
which setup u want to built...
4 channel amp can work for u ... but which 4 channel amp ... like if ur amp is producing 60RMS per channel or 180rms on bridge... so u have to install a woofer which have about 250RMS max to get good and deep bass....
if u install 400rms woofer like 307d2 pioneer it will not give u 100% result on that amp then u have to install a mono amp or an amp which have high RMS on bridge...
think before u leap
for further info u can contact me