What's the difference between amps and watts?

Whats the difference between these types of amps?

• whats the difference between a 2 channel amp a class d amp a mono amp and a 4 channel amp?

• Answer:

  The most common classes of car audio amps are A/B and D. Class A/B amps are commonly uses on highs. A/B amps aren't as efficient as class D amps and they produce less distortion. Class D amps are used for subs and come only in mono channel configurations. These amps produce more distortion but are more efficient then A/B amps. Mono channel amps are use for subs, they only come in class d. 2 Channel amps can usually be used one of two ways. 1) They can be hooked up to one pair of speakers, or 2) it can be bridged to make a "bigger" mono channel amp for subs. 4 channel amps are used to power 2 sets of speakers, usually.