Amp Audio

How Small Can They Get? – The New Generation Super-Miniature Audio Amps

Newest types of super-mini audio amplifiers underline the ongoing trend of miniaturization of consumer products such as cell phones or computers. Everything is becoming smaller and manufacturers are packing more and more features into the same space. 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 substituted by solid state amps for the most part.

While traditionally there would be separate pre amp and power amp stages, today’s solid-state amp combine everything into a neat box no larger than the size of a VCR. New developments in audio technology in regard to power efficiency of have allowed the development of a new generation of super-miniature audio amplifiers, such as Amphony’s microFidelity Model 100. Even though these amps are as small as a deck of cards, they are able to deliver up to 50 Watts power and without difficulty drive a speaker to full volume.

In history, audio amplifiers would have comparatively low power efficiency due to the “Class-A” and “Class-AB” structure of analog amplifiers. Analog audio amplifiers will only convert between 20% to 30% of the consumed power into audio while the left over portion is dissipated as heat. Analog amplifiers therefore need significant cooling which is done by heat sinks that are often bulky and prevent the amplifier from being made very small.

“Class-D” amplifiers are based on a digital design which can provide higher power efficiency than “Class-A” or “Class-AB” amplifiers – typically in the order of 80% to 95%. Therefore 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 causes non-linearity and consequently some amount of distortion of the audio signal. This disadvantage has slowed the progress of digital amplifiers.

Newer amplifier technologies have emerged such as “Class-T” and newer “Class-D” architectures. These technologies, such as the one used in Amphony’s Model 100 provide for a feedback of the output signal to the amplifier input. By using this feedback, the amplifier can compensate for nonlinearities of the output stage. This permits the distortion to be reduced to levels similar to analog audio amplifiers. At the same time the amplifier provides the high power efficiency of digital amplifiers.

These new 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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