“I was looking for a work solution to drive my relatively low impedance headphones I use at work (Shure SRH840 and Grado SR225e), while also being able to feed my powered desktop speakers (BOSE companion II). As I don't do critical listening at work, I didn't need the highest level of audio quality, but I needed something small and portable so that I could easily put it in my briefcase...” --fjrabon
“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
“This small desktop amp fulfills the need for an unobtrusive device to be used at work. It is small enough to fit on my workstation and the simple design is not distracting to myself or anyone around me. I used it initially to drive my ATH-M50Ws but have recently upgraded to Audeze EL-8Cs. There is no issue in driving either headphone, but they do make the Audeze EL-8Cs sing. ...” --bearcat1986
“ ****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
“This is my first product made by Audioengine and you can color me impressed. It's the third USB stick-style amp/DAC I've used (others are Dragonfly v.1 and GO1000), and honestly I think I like it best. It's got power for days, a tiny footprint, and it's plug-and-play! As for the sound? Well, just read on... The Breakdown: Test Songs (all ALAC either...” --JoeDoe
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...