“Having owned the HD 800 for more than three and a half years now I've spent untold hours looking into ways of bringing the best possible sound out of them. When Sennheiser announced the HDVD 800 it made my future upgrade decisions easy. I took the chance of being an early adopter, getting it before any reviews were out and hardly anyone had even posted impressions. Now several months later I...” --TheManko
“This review is based on matching the Mini X with Hifiman He-500 Headphones. You may be reading this review, unsure what to make of this Amp, asking how can a cheap sub $200 amp offer the power needed for an expensive Headphone such as the Hifiman He-500? If you have done your homework you will find this is the stereo amp everybody is...” --fluidz
“I think this is one time I was thankful another headphone amp failed and I was forced to seek out a replacement. I stumbled on the Sennheiser HDVA 600 with it's balanced inputs, balanced pass through outputs, enough headphone outputs for (2) sets of balanced headphones and (2) sets of 1/4" headphone plugs. This headphone amplifier is beautiful, modern, elegant, what you would expect...” --LiteJazz
“ ****Note**** As always, these are strictly my opinions. I try to present these products as honestly as possible and try to describe them as best as possible. As always, YMMV. ****NOTE**** FISCHER AUDIO MYSTIFY PORTABLE HEADPHONE AMP SPEC’S: Frequency “flatness”: +/- 0.5db Dynamic Range: 110 db Total Harmonic Distortion: 0.001% Intermodulation...” --LFF
UPA-200 represents a true breakthrough in audiophile-quality amplification. At last, a truly affordable stereo power amplifier that can satisfy the most discerning aficionado, and at the same, is affordable to anyone with a desire for real quality. Our advanced engineering and design techniques have resulted in an amazing new amplifier. Its rock solid performance and affordable price point...
Frequency range: 10Hz-20kHz Amplitude-frequency responce (AFR) irregularity within the frequency range: 0.3 dB Dynamic range: 110 dB Harmonic distortions: 0.002 % Intermodulation distortion (CCIF) 0.006 % Interpenetration of channels at frequency 1 kHz: -73dB Rated input voltage: 0.5 Maximalinput voltage: 3.5 V Maximal output voltage at the non loaded output: 10 V Maximal undistorted power...