An audio amplifier
that amplifies only a single channel, as opposed to a stereo
amplifier which handles both stereo channels. They are usually sold in pairs, though they are easily used in multi-channel and bi-amplified systems. Separating the channels into disparate
chassis has a positive effect on sound quality, since there is no chance of crosstalk
with the other channel, and the power supply does not have to be shared with other channels. Most monoblocks are larger than 200 watts, because the electrical current
demands of smaller amps are not so rigorous
as to cause trouble when sharing a box with another channel.
Amps made in this manner are usually quite expensive
, but are of very high quality. They are often large and quite heavy. Looking at any given model you can see why it is called a "monoblock."