High Performance DAC AH-D6.1 on ak4493 / ak4490

Excellent quality PCB. The board has gone through multiple operational amplifier changes. This is premium version of my old DAC AH-D6 (2 Layers PCB). The new DAC is made on an improved 4-layer printed circuit board. AH-D6.1 has improved the power supply regulator and analog filter circuitry. DAC has ultra-low harmonic distortion - AK4493 - 32-bit Stereo Premium D/A Converter DR, S/N: 123dB, THD+N: -113dB - PCM up to 384KHz/32Bit - DSD/DOP 64,128 and 256 - I2S input (master and slave mode), 2x5 Pin - 2.54mm connector - 2 scales (44.1x/48x) MCLCK oscillators on board (NDK femto clocks) - 11 Super Low-Noise voltage Linear Power regulators - AK4493 VREF Ultra–low noise Linear Power - Hardware Relay Mute at the outputs - Microprocessor based control - Sharp/slow roll-off filter switch (jumper configuration). - THD < 0.0001%, THD+N < 0.0002% - Board size is 69x100mm, 4 layer PCB More Details: http://audiohobby.ru/articles/vysokokachestvennyi-cap-ah-d6-1-na-ak4493-ak4490-premialnaja-versija-ah-d6.html