8
Controls and functions GZPA 4SQ
BIAS adjustment
Adjusting the BIAS setting influences the operation mode and sound of the amplifier. Increasing the BIAS
setting clockwise leads to a warm sound experience with wide stereoscopic sound comparable to the
performance of a Class A amplifier with increased current consumption und heat generation. Reducing the
BIAS setting counterclockwise results in direct and clear music reproduction. Depending on the speaker´s
characteristics and the mounting positions, the adjustment is up to the listener´s taste of music reproduction.
The BIAS setting however, does not influence the general output power of the amplifier
LED illumination
Optionally, the LED illumination of the Ground Zero logo can be switched off. For this purpose, the jumper
positioned on the back side of the top aluminum cover needs to be removed from the illumination pc board.
GROUND Vehicle ground connection
REMOTE Remote connection (turn-on voltage)
Control for correct input sensitivity adjustment
Switches to activate the high pass filter (separately for front and rear)
Switches to multiply (x10) the high pass filter frequency range
Controls to adjust the correct high pass filter frequency
Switches to activate the low pass filter (separately for front and rear)
Switches to multiply (x10) the low pass filter frequency range
Controls to adjust the correct low pass filter frequency
Controls to adjust the BIAS setting (check the BIAS adjustment info
below) for each pair of channels separately
POWER (white) indicates the correct operation mode
PROTECT (red) indicates a defect / activated protection mode
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