Latest types of audio super-mini amplifiers confirm that audio technology has gone the same path as computer technology and cell phones. Everything is becoming smaller and vendors are packing more and more features into the same space. You probably still recall the good old tube amps which would dominate the living room. Whilst tube amps are still popular amongst fanatics, audio amplifiers nowadays are solid-state amps for the most part.

Modern solid-state amplifiers merge the traditional pre amp and power amp stages into a neat single box no larger than a DVD player. Thanks to latest developments in audio technology regarding amplifier power efficiency, a new generation of super-miniature amps has become feasible, such as the Amphony Model 100 microFidelity amp. Even though these mini amps provide up to 50 Watts – sufficiently to drive a speaker to high volume, they are no larger than a deck of cards.

In history, audio amplifiers would possess comparatively low power efficiency due to the “Class-A” and “Class-AB” architecture of analog amplifiers. Only a small part of the consumed power – typically in the order of 20% to 30% – is in fact transformed into audio by analog amplifiers. The remaining portion is radiated as heat. Therefore analog amplifiers require a reasonable amount of cooling. The amount of cooling depends on the amplifier rated output power. These heat sinks prevent the amplifier to be built into a small form factor.

“Class-D” amplifiers are based on a digital design which offers larger power efficiency than “Class-A” or “Class-AB” amplifiers – typically in the order of 80% to 95%. Thus only a small portion is wasted as heat which was the key in being able to miniaturize audio amplifier designs. One major downside of “Class-D” amplifiers is the fact that digital “Class-D” amplifiers use a switching stage at the output which creates non-linearity and therefore some amount of distortion of the audio signal. This drawback has slowed the advance of digital amplifiers.

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. This feedback enables the amplifier to compensate for nonlinearities of the output switching stage and thus lower audio distortion to similar levels of analog amplifiers while preserving the audio efficiency of digital amplifiers.

These latest miniature audio amplifiers open up applications where traditional amplifiers have failed. They are suited in particular for installations with minimum space, such as in ceiling speakers. Other applications include connecting speakers to a DVD/MP3 player or cable box.

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