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Implementing A/B Select on a FreeSpace IZA Amplifier Without a Volume Control

Relevant Product(s)

  • FreeSpace IZA 2120-HZ
  • FreeSpace IZA 2120-LZ
  • FreeSpace IZA 190-HZ
  • FreeSpace IZA 250-LZ

Procedure

The amplifier can be controlled with a linear taper 10k ohm potentiometer (fully CCW = 0 ohm, fully CW = 10k ohm) and a Single Pole Double Throw (SPDT) switch.

  • When the SW1 switch is set to short, A/B pin to the COM pin, the amplifier switches to input A. When the SW1 switch is set to make the A/B pin open, the amplifier switches to input B.
  • For a fixed output Volume Level (Output Level Adjusted by the Zone Output Trim), substitute a 10k Ohm resistor for the 10k ohm potentiometer.
  • For a fixed Input Selection (Always Input A), use a wire jumper to short the A/B pin to the COM pin.
  • For a fixed Input Selection (Always Input B), leave the A/B pin to the COM pin open – no connection.

 

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