“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 have been researching a more potent amp for my desktop system and all I have to say is Wow! I just plugged the MX1 into my office system for the first time and I am very impressed. The amp section is robust enough to drive my HD650 in a similar (not quite as refined) fashion as my Schiit Lyr in my main system. Great extension in the bass with solid mid, airy and extended top end indicating...” --milosolo
“ ****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
“ The Audinst HUD-mx1 compact DAC/headphone amp was a great little unit. It also happened to be one of the very first reviews that I did at HeadFi. In the subsequent years I've gone on to review dozens of other products from amps to DACs to headphones and more, and I also went on to become something of a "real" reviewer at InnerFidelity. Through all that, I've never stopped...” --project86
“ See full review here: http://www.head-fi.org/t/568054/review-audinst-amp-hp-portable-headphone-amplifier#post_7697280 In summary, this is a great sub-$200 portable amp. It's like Audinst took the already nice sounding amp section of their HUD-mx1 device, improved it by maybe 15 or 20 percent, and then made it portable. What's not to like about that? ” --project86
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...