A universal host-powered multimedia speaker system derives its power from a host
multimedia computer system chassis, rather than from a conventional dedicated speaker
system power supply. The speaker system includes a pair of amplifiers with differential
connections for receiving the audio signal and with differential output connections
to the speaker to provide it with differential amplification. Differential input
amplification amplifies the difference between the signals applied to the amplifiers
and thereby rejects the common-mode noise, which including ground circuit electrical
noise. Differential output amplification refers to a pair of amplifiers that generate
output signals that are 180 degrees out of phase with each other. The differential
output amplification provides rejection of power supply electrical noise components.
This differential input/differential output host computer-powered speaker system
provides low noise, high quality audio playback for multimedia speaker systems
deriving power from the host multi-media computer system.