Zinc is a universal instrument amplifier module The instrument amp uses the input from the rack, and has a gain range of -20 to +20dBSwitching to the Z-in on the front panel, the gain range becomes 0 to 40dB The glow function works on either input and introduces valve (tube) distortion (2nd and 3rd harmonics). Try it ! The Z-In Ω rotary switch changes the input impedance of the Z-input, actually changing the tone.This is most effective on electric guitar, but can be used on anything you like. Zinc features Barium, our reference bargraph meter. Specifications: • Input Impedance (XLR): 20k• Input Impedance (Jack): 20k to 8M variable• Maximum Input Level (unity gain): +26dBu (Octa module)• Maximum Input Level (unity gain): +22dBu (500 module)• Frequency Response (-1dB): 15Hz to 40kHz• Frequency Response (-3dB): 7Hz to 80kHz• Noise floor (typical, unweighted, XLR): -100dBu• Noise floor (typical, unweighted, Jack): -80dBu• Total Harmonic Distortion (Glow off): 0.0004%• Inter Modulation Distortion (Glow off): 0.0004%• Common Mode Rejection (XLR): -80dB• Maximum Output Level: +32dBu (Octa module)• Maximum Output Level: +26dBu (500 module)• I/O connections (Rack XLRs): pin 2 +, pin 3 -, pin 1 ground• I/O connections (Jack, unbalanced): Tip +, Sleeve ground• Current requirement: 100mA (maximum) per rail• Size and weight: Standard 500 Series, 0.4 kilos Zinc is available as 500 or Octa module with “Silver” or “Black” faceplateMore details at the Zinc product page on the Interphase Audio website