range and the particular of the sound overall. There is even some headphone amplifiers which have been especially tailored to improve the performance of certain MP3 machines. This is where CMoy headphone amplifiers come in. A CMoy is a pocket headphone amp first madedesigned by Chu Moy. A headphone amp is made around single or dual- channel op-amps including Burr Brown's OPA2134 or OPA2132PA, even though, a wide variety of op-amps have been correctly administered. The amps will operate for many hours on a single 9 volt battery. To pick the perfect headphone amp you should look no further than the CMoy headphone amp which provides excellent playback and audio clarity.