“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
“ So far I have used this amp with two different headphones: the Hifiman HE5LE, and the AKG K601. I'll start with describing how it sounds with the AKG K601. First, let me note that one absolutely must put a 120 ohm series resistor at the output in order to be compatible with the K601. AKG specifies that the K601 should be driven by amp following the IEC standard, which is 120...” --mike1127
“ ****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
“In the months leading up to the release of the EF-6, I was considering the few options available for amplifying the HE-6, there is basically speaker amplifyers and a few pre-amplifiers designed to power the AKG K-1000, which was prior to the HE-6 the most notoriously difficult headphone to drive on the market. A few things stood out about the EF-6, there was the handsome good looks, the...” --drez
“ Yeah, I agree with The Wuss. I am rather new to the headphone amp universe. So, don't choose to (or not to) buy baseed on my review alone. I listening to the HiFiMAN EF2A through my Grados and a pair of Sony Studio Monitors I use for live music mixing. The Sonys were instantly revealed as crap for critical listening. The Grados came to life and quickly...” --zammaster05
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...