Adjustment of negative output resistance in Sub+ MkII amplifier (B5)
Set jumper “Set ” on power amp pcb in Trim position.
Connect a signal generator to input and an AC voltmeter to speaker output.
Set level and frequency controls to maximum (fully clockwise) and switch amplifier on.
Set signal generator to 50 Hz and adjust level until AC voltmeter on speaker output reads
1.00 V under no load condition.
Connect a resistor 8.00 Ohm (1%) to speaker output.
Adjust trim potentiometer VR202 until AC voltmeter reads 6.27V.
Switch amplifier off and set jumper in Run position.
Important note!
This is an amplifier using ACE Bass technique. It can only be used with the driver
to which the specific ACE Bass circuit is designed
.
