High Power
How Tiny Will They Get? – The New Generation Super-Miniature Audio Power Amps
Newest types of super-mini audio amplifiers show the ongoing trend of miniaturization of consumer devices such as cell phones or computers. Everything is becoming smaller and manufacturers are packing more and more features into the same space. You most likely still recall the good old tube amps which would dominate the living room. Whilst tube amps are even now well-liked among fanatics, audio amplifiers nowadays are solid-state amps for the most part.
Modern solid-state amplifiers combine the conventional pre amp and power amp stages into a neat single box no larger than a DVD player. 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 mini amps deliver up to 50 Watts – plenty to drive a speaker to high volume, they are no larger than a deck of cards.
Past audio amplifiers with “Class-A” and “Class-AB” architectures have fairly low power efficiency. Analog audio amplifiers will only convert between 20% to 30% of the consumed energy into audio while the left over portion is dissipated as heat. This requires that depending on the supported output power, analog audio amps have to provide considerable cooling which is accomplished by utilizing heat sinks. These heat sinks do not permit these amplifiers to be made very small.
Digital “Class-D” amplifiers offer higher power efficiency than analog amplifiers – usually around 80% to 95% – and thus can be miniaturized. “Class-D” amplifiers utilize a switching output stage. This stage introduces nonlinearities which creates audio distortion. This difficulty has had an impact on the triumph of digital amplifiers.
Some new amplifier technologies have emerged. Among 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 allows the amplifier to compensate for nonlinearities of the output switching stage and as a result lower audio distortion to similar levels of analog amplifiers whilst preserving the audio efficiency of digital amplifiers.
These new generation miniature audio amplifiers are suited for a range of new applications where previous audio amplifiers have failed. These applications include installations, such as in-ceiling installations, with minimum space or connecting speakers to a cable box or DVD/MP3 player where minimal space is important.
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