Kenwood KAC-6104D Owner's Manual (pdf) - Page 8

Controls  LPF FREQUENCY[Hz] 150 100 70 50 200 INPUT SENSITIVITY[V] 2 1 0.5 3 0.3 4 [MIN] 5 0.2 [MAX] OFF ON BASS EXPANDER LINE IN L R SPEAKER LEVEL INPUT  40W-15W 2 1 0.5 3 0.3 4 [MIN] 5 0.2 [MAX]  1 Power indicator When the power is turned on, the Power indicator lights. If the Power indicator does not light when the power is turned on, the protection function may be activated. Check whether there is any indication of trouble. Refer to (page 5). 2 LPF(Low-Pass Filter) FREQUENCY control This control adjusts the frequency band output from this unit. 3 BASS EXPANDER switch Setting this switch to "ON", when a certain volume is exceeded, a dynamic bass sound is output. 4 INPUT SENSITIVITY control Set this control according to the pre-output level of the center unit connected with this unit, or to the maximum power output of the genuine-accessory car stereo. Use the diagram on the right as a guide.  English