Components use a passive crossover, so one channel to the crossover -> separated for the tweeter and midbass so you'll be fine with two channels to the front.
You can bridge two channels of the amp to power a sub, depending on the amp, you'd most likely need a sub that has a single 4ohm voice coil or dual 2 ohm voice coils wired in series.
You can bridge two channels of the amp to power a sub, depending on the amp, you'd most likely need a sub that has a single 4ohm voice coil or dual 2 ohm voice coils wired in series.
Comment