“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
“Although I've only had this about a week, I've decided to post since there is a dearth of posted reviews. First about me; prior gear I have had - Grado Headphone amp, Headroom Micro amp, Stax SR-5 headphones, Grado 325 headphones current gear -Music Hall 25.2 headphone amp, Grado 80 headphones, Hifiman HE-400 headphones biases - tube gear, planar and electrostatic speakers.... headphones...” --davide256
“Hifiman EF2A Review Overview:This is my first headphone amp review and I'm just going to review the amp section of this headphone amp as the DAC is nothing special, a bit better than most computer or portable device DACs but is easily outclassed by any decent dedicated DAC or soundcard. I've had this amp for a while and I tried it with a variety of AKGs, Senns, Beyers, as well as a few...” --kman1211
“ ****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
“HiFiMAN ran this combo deal last year (2014) for $249, HE-300 Headphones and the EF3 amp. What a deal this has been. The EF3 amp is similar to the well known EF2A amp minus the DAC circuitry. The EF3 has a three position gain switch and a black and gold color scheme. A gold colored push button power switch ignites the glow of the tubes and a dim LED surrounds the volume knob in a ring of blue...” --Stereocilia
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...