With RCA Hi Passes for Quatros
Make sure you run Track 27 off Vandertones
put voltmeter on AC Volts which is hooked up to plus / minus of amp
adjust volume to 1 V AC with Trk 27 1000 hz tone.
Next switch to Track 30 and make sure you read ,707 on the volt meter.
if not start above over with reaching 1 V / .707
adjust high pass dip switches until you reach .707
Best JohnnyR
Audio Connection