CONTROL FUNCTIONS
1. SPEAKERS
Connect speakers/subwoofers to these terminals. Be sure to check wire for proper polarity. Never
connect the speaker cables to chassis ground.
2. +12 Volt Power
Connect this terminal through a FUSE or CIRCUIT BREAKER to the positive terminal of the vehicle
battery or the positive terminal of an isolated audio system battery.
Warning: Always protect this power cable by installing a fuse or circuit breaker of the appropriate
size within 18 inches (45cm) of the battery terminal connection.
3.Remote Turn On
This terminal turns on the amplifier when (+)12 volt is applied to it . Connect it to the remote turn
on lead of the head unit or signal source.
4.GND
Connect this cable directly to the frame of the vehicle. Make sure the metal frame has been stripped
of all paint down to the bare metal. Use the shortest distance possible. It is always a good idea to
replace the factory ground at this time with a larger cable equal to the new amplifier power cable or
larger.
CAUTION:
Do not connect this terminal directly to the vehicle battery ground terminal or any
other factory ground points.
5. RCA input jacks
These RCA input jacks are for use with source units that have RCA outputs. A source unit with a
minimum level of 200mV is required for proper operation. The use of high quality twisted pair
cables is recommended to decrease the possibility of radiated noise entering the system.
6. REMOTE
Connect the remote controller to control the subwoofer amplifier volume from the driver seat
location, for ease of adjustment during playing.
7. Gain Control
The Gain control will match the amplifiers sensitivity to the source units signal voltage. The
Operating range is 5V to 200mV. This is NOT a volume control!
8. Low Pass Filter Control (Mono block)
This control is used to select the desired low pass x-over frequency. The frequency can be adjusted
from 40Hz to 220Hz for all bass mono models.
9. Subsonic Filter Control (Mono block)
This control can filter out unwanted low frequency from 10Hz (OFF) to 50Hz. This function will
increase the power handling of your woofers.
10. Bass Boost Level switch (Mono block)
This switch can boost bass level by 0dB, 6dB or 12dB. The boost frequency is centered at 50Hz.
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ZACHRY CAR AUDIO
11. Hi-pass filter (Full range)
This knob controls the frequencies played for the front channels. Low frequencies can be cut out
from OFF to 200Hz. At OFF position, none low frequency cut out, that means full pass.
12. X-over mode and frequency Control (Full range)
These controls allow control over the frequencies played for the rear channels. There is an option
for Low Pass, Full Range or High Pass. In LP or HP mode, the crossover frequency can be tuned from
50Hz to 750Hz by the frequency knob.
13. Power Indicator
This LED will light up when amplifier works properly.
14. Protection Indicator
The red LED will light up and will be flashing if there is a fault presented to the amplifier. Please
disconnect the amplifier and resolve the fault before reconnecting the amplifier.
PANEL LAYOUT
Fig 1.
4-ch amplifier panel layout
1
2
3
4
5
7
11
13
14
12
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Zachry K475
Zachry K475
K475 Hi-Fi Car Amplifier
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