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How Tiny Will They Get? - A Look At Super-Miniature Amplifiers
New generation super-miniature amplifiers are a result of the same miniaturization that has caused computers and cell phones to shrink. Products are shrinking at a rapid pace. At the same time, vendors are packing in more and more features. The majority of audio amplifiers would be tube amps in the past. Although a large number of fanatics still is fond of tube amplifiers, they have been replace by solid state amps for the most part.
Modern solid-state amplifiers merge the traditional pre amp and power amp stages into a neat single package no larger than a DVD player. A new generation of super-miniature amplifiers, such as the Amphony Model 100 microFidelity amp, has become feasible due to new developments in audio technology regarding power efficiency. These mini amps take up no more space than a deck of cards but deliver up to 50 Watts, which is enough to drive a speaker to high volume.
Past audio amplifiers with "Class-A" and "Class-AB" architectures have comparatively low power efficiency. Analog audio amplifiers by nature only convert a small percentage of the power they consume - typically in the order of 20% to 30% - into audio whereas a large part is dissipated as heat. Analog amplifiers hence need substantial cooling which is done by heat sinks that are often bulky and prevent the amplifier from being made very small.
Digital "Class-D" amplifiers offer higher power efficiency than analog amplifiers - typically around 80% to 95% - and thus can be miniaturized. One major difficulty which has slowed the progress of "Class-D" amplifiers is audio distortion which is caused by nonlinearities of the switching output stage.
Some new amplifier technologies have emerged. Amongst those are "Class-T" and newer generation "Class-D" architectures. These types of new architectures, such as the technology used in Amphony's Model 100 use a feedback mechanism. The output signal is fed back to the amplifier input. Using this design, the amplifier is capable to compensate for errors caused by the switching output stage. Amplifiers based on this design are able to accomplish low audio distortion comparable to traditional analog amplifiers but at the same time the power efficiency of digital amplifiers.
These new generation miniature audio amplifiers open up applications where previous amplifiers would fail, such as speaker installations where space is premium, such as in-ceiling speakers and applications that connect speakers to a cable box or DVD/MP3 player.
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