Infinity 7540a amplifier
I recently aquired one of these amps used. I hooked it up to a set of Kenwood separates (front/stereo) and a single 4 ohm 10 driver (rear/bridged). The mids/tweets are very clear while that single Kicker Comp 10" in a sealed box @ 278w literally shakes the seats; this system was for my daughter who primarily listens to rap/dance. All of her friends are shocked by how loud and clean her system is.
Pros: Price, sound very musical, I am shocked at how hard the bridged channel can power the base!
Cons: It is a very large amp which makes it a challenge to install.