Mono Block

A monoblock just separates the two channels into separate (mono) systems. The advantage is less cross talk between channels. The disadvantage is cost.

The other advantages are that the typical monoblock that is a mono version of the same stereo amp has a much more highly rated power supply. This doesn't necessarily give much greater power but usually it invests monoblock versions with a great deal more grunt. The power supply is the most important part of the power amp - it's what serves the juice to be able to drive the speakers, so when your reservoir is twice as big, you can effectively go a lot longer at the same level, or supply bigger bursts of power.

The only disadvantage I can think of apart from cost is the earthing arrangement. A stereo power amp has both channels tied to the same earth point. Monoblocks don't have this since they're separate. A difference in earth potential can make the amps sound slightly difference and can even introducec mains-borne noise. Therefore, it's usually recommended that the monoblocks are plugged in as close to each other as possible. If using a 4-way block, then they should be plugged in next to each other for example.

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