Why might want amplifier for headphones? For two reasons. First, the quality hi-end- "ears" could not "even" upgrade MRZ- player powerful. The second reason is the desire to make a sound "medium" headband slightly better, giving warmth and brightness of the sound.

To test used two models Sennheiser headphones: hi-end- model HD600 and easy but good HD201.

Only one player who visits in our test lab has been able to hand signal sufficient to allow the volume HD600 has been more or less acceptable. Those on the Cowon iAudio 6. Power goes signal other devices lacked - HD600 play around quietly.

HeadRoom assisted BitHead can be used in two ways. First-connect MRZ-player a gadget to the entrance line, and the exit-headphones.

The second way is to connect the amplifier to the USB port of your PC. In HeadRoom BitHead attends own converter (DAC), so that the amplifier can operate as external sound card. The device automatically recognized by the HR-Windows device drivers is not required. Of course, BitHead not add up to the same external Audigy 2 NX, but the sound quality markedly better than notebook When connecting to the PC food comes from the USB.

"In the portable mode," HeadRoom BitHead works from four AAA batteries that are in short supply by about 30 hours. It is a good indicator, because modern players rarely worked from one charge longer.

Two buttons on the shell - Gain and Crossfeed-permit, respectively, and to raise the volume a little confused signal channels, improving the overall picture. Gain will not need to most headphones-only for a very "lots". Crossfeed can and should be used on recordings, where left and right channels are too dispersed, which is not uncommon in poor-quality compression.

After connecting to the mobile amplifier several players, it was noted not only increasing volume, but also a marked improvement in sound quality. Of course, the level of audiofilskom speech is not to the players, and portable. But there is a change: the frequency started better shared, bass became more juicy.

The appliance has several disadvantages. When using at maximum volume with the HD600 amplifier "roars" is not enough power. A circuit breaker failed. In a bag accidentally HeadRoom BitHead can be involved, leading to defuse batteries. Even minus-big size and weight and high price of 200 dollars. Nevertheless, with its task well copes amplifier is the main plus.