Subwoofer Controls And Switch; Fault Tracing - Volvo FM Handbook

Booster 445

Subwoofer controls and switch

It is possible to make adjustments to Volvo's multi-
channel booster VA 400.8 to optimize the subwoofer
performance in different vehicles.
Volume: Scale range: 0 dB–12 dB steplessly
adjustable
The dot on the scale is Volvo's reference setting.
LPF: Scale range: 50 Hz–120 Hz steplessly adjustable
The dot on the scale is Volvo's reference setting.
Phase adjustment: Scale range: 0°–180° steplessly
adjustable
The dot on the scale is Volvo's reference setting.
Phase switch: Positions: NORMAL – INVERSE
NORMAL position is Volvo's reference setting.
J8011992

Fault tracing

Fault: The sound is shut off after a period of normal
use.
Information: After a very high sound level for a long
period and/or high temperature in the baggage/storage
area, the booster can go to protected mode due to
overheating. The sound is shut off and the red lamp
lights.
Action: Lower the volume on the main unit to level 10
and wait for the sound to return.