Height: Width: Depth: 15.2mm 72mm 47mm -The substrate in which two functions, electronic volume and the amplifier for 　a meter display, were carried / -Adopt R-2R resistance rudder type CS3310 (Cirrus Logic) as electronic volume IC. -The remains noises of the whole substrate are 10 microvolts or less 　(filter AES-17 A-weightet) and a low noise. -Change at a 0.5-dB step is possible for a gain. Input 1 system(stereo, unbalanced from DAC board) Output Audio system output 2 system For Power amp:Monaural imbalancex2 For headphones amplifier:Stereo imbalance The meter output 1 system(Needle-type VU total outputx2、The output for peak metersx2、the differential output simple in all)) Control interface SPI(used by gain setting) Power supply +/-12V The output voltage(gain, sensitivity) 1.8Vrms(@input2.2Vrms、volume0dB、1kHzSine wave)