Thanks for visiting MobilMe. Please remember to bookmark this page Fi At&t Latest Model. If you found what your looking for, then don"t forget to click an appreciation button above for this post.
Fi At&t Latest Model
How Small Can They Get? - The New Generation Super-Miniature Amplifiers
Recent models of audio super-mini amplifiers confirm that audio technology has gone the same path as computer technology and cell phones. While the features are growing, the size of today's consumer products is getting smaller and smaller. In the past, tube amps would be commonplace and take up a large part of the living room. Tube amps still have their fair share of fanatics. Nonetheless they have been replaced by solid-state amps for the most part.
While historically there would be separate pre amp and power amp stages, today's solid-state amp merge 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 mini amps deliver up to 50 Watts - plenty to drive a speaker to high volume, they are no bigger than a deck of cards.
"Class-A" and "Class-AB" amplifier topologies were the two primary amplifier architectures of previous audio amplifiers. These technologies have rather low power efficiency. Only a small percentage of the consumed power - typically in the order of 20% to 30% - is actually converted into audio by analog amplifiers. The left over portion is radiated as heat. This requires that depending on the supported output power, analog audio amps have to provide considerable cooling which is achieved by using heat sinks. These heat sinks do not permit these amplifiers to be made very small.
"Class-D" amplifiers are based on a digital design which allows higher power efficiency than "Class-A" or "Class-AB" amplifiers - usually 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. "Class-D" amplifiers utilize a switching output stage. This stage introduces nonlinearities which causes audio distortion. This problem has had an influence on the success of digital amplifiers.
More recent "Class-T" and newer "Class-D" amplifier architectures, such as Amphony’s Model 100, incorporate a feedback mechanism where the output of the amplifier is fed back to the 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 previous analog amplifiers but at the same time the power efficiency of digital amplifiers.
These new miniature audio amplifiers open up applications where previous 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.
If you are looking for a different item here are a list of related products on MobilMe, please check out the following:
