Circuit topology: Three (3) dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A mode. Input gain range: Balanced, Class A, 20k ohms, -20dB to +16dB with high gain switch Maximum input level: +36dB balanced XLR pin 2 hot Maximum output level: +30dB balanced 600 ohms, DC coupled, discrete Class A Output type: XLR connector, output trim gain -45dB to +6dB Noise 20kHz unweighted: -92dB Distortion THD, IMD: 0.5% Frequency response -3dB: 1Hz to 200kHz Gain reduction meter: High quality, illuminated gain reduction meter 0dB to -20dB range Output meter: Twin 20 segment LED VU meters with -27dB to +30dB range Compressor type: Optical passive attenuator Make-up gain: Variable 0dB to +10dB stereo tracking Threshold – Ratio: Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1 Attack – Release: Attack variable 2mS to 200mS, release variable 100mS to 5 seconds Side-chain spectral contour: Variable threshold -15dB to +15dB, frequency 70Hz to 9kHz twin ranges Equalizer type Discrete: Class A, passive design optimized for full range program material Frequency bands (6):   Variable amplitude LF +/-24dB 15Hz shelf response
Variable amplitude MF1 +/-8dB 125Hz selected Q response
Variable amplitude MF2 +/-4dB 500Hz selected Q response
Variable amplitude MF3 +/-4dB 2kHz selected Q response
Variable amplitude MF4 +/-10dB 5kHz shelf response
Variable amplitude HF +/-20dB 32kHz shelf response AC power: Internal toroidal 100v to 240v, 50-60Hz selectable, 70 watts maximum Dimensions: 19 x 12 x 3.5 in (482 x 305 x 89mm) Weight: 22lbs (10kg) Dimensions-shipping carton: 21 x 18 x 8 in (533 x 457 x 203mm) Weight-packed: 26lbs (11.8kg)