Philips 22RH544

摘要

Some will argue that Philips' Motional Feedback loudspeaker (1975-85) represents the greatest single advance in electromagnetic loudspeaker technology since the invention of the moving-coil driver. There are two key technologies with the system. The first is active operation, where an electronic crossover and a number of power amplifiers (usually two) are housed within the loudspeaker cabinet. Co-locating the amplifier with the drive units practically eliminates connector and cable losses and allows the damping factor achieved by the amplifier/ speaker combination to approach its maximum potential value. Also, the protection circuitry required can be greatly simplified, which in turn helps to preserve the purity of the signal path.