“ I bought this DAC-preamp and after several attempts made the following changes to it for an amazing result: Installed 5670 Raytheon Windmill getter tube upgraded diodes to Schottky Diode 11DQ10 Changed the output coupling caps to Sanyo Oscon 47uF opamp for tube to LT1364 or metal version of LM4562. The biggest gain came from opamp then the diodes. Do not...” --Lecentaur
“ Don't be mistaken this amp has a fantastic value for the money. If you need lots of power and speaker taps don't look further take this one. The only thing I regret is that the volume knob can do a harsh sound when you turn it to rapidly. ” --Puranti
“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
“ ****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
“ I have nothing to compare it it to. I guess you could go with what people have said about the D1 but with a little bit more s/n. Hopefully I can get a hold of more equipment so I can evaluate both ” --BLACKENEDPLAGUE
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...