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SYMPTOM PROBABLE CAUSE
9. Constant level whining Check for a ground loop in the system. Turn the system off
noise (most noise with and one by one change the ground connections (by
source unit volume at changing to a different contact point,scraping the level
minimum) constant irrespective of metal clean of any paint, rust or
grease). Turn the system on and check for whining noise
after each ground change.
CAUTION: Do not disconnect the Power Amplifier's ground when the
system is on. This could damage the amplifier.
Check for defective signal cables. Disconnect signal cables
at the amplifier and listen carefully for noise. If the noise dis-
appears, run a test pair of signal cables. If there is no unde-
sirable whining noise, reconnect to the amplifier with the
new pair of signal cables. Check battery ground connection
to the vehicle chassis to make sure it is tight and clean.
Check battery negative terminal connection to make sure it
is tight and clean.
10. Radiated noise: crackling Check if the noise is actually radiated noise: Tune a portable
noise on FM which is not radio to the same FM station. Move the portable radio
present when playing tape close to the vehicle engine. If crackling noise comes from
or CD (noise varying slightly the portable radio, then the noise you have in your vehicle
with accelerator but is audio system is radiated noise.Check with a VOM (volt
present at all times) meter) to make sure the antenna is really grounded to the
vehicle chassis.
To ensure a true ground, break the plastic covering of the
antenna lead and solder a piece of heavy wire (minimum
14-gauge) to the braided shield.
Ground the other end of the wire at the same point as the
radio ground.
Check spark plug wires. They should be suppression-type
wire and less than 2 years old. Otherwise, replace them
with good quality suppression cables.
Make sure engine block is grounded to the vehicle chassis
at a bare metal spot (scraped clean of paint, rust and
grease).
Make sure hood is also grounded. If not, use a ground strap
(which is available from any auto parts store) to ground the
hood to the vehicle chassis.
COUSTIC.COM
17
SPECIFICATIONS:
321QE 481QE
Rated Power @ 14.4 V (0.1 % THD) : 4 x 40 Watts 4 x 60 Watts
4 Ohm Stereo
Rated Power @ 14.4 V (0.1 % THD) : 4 x 80 Watts 4 x 120 Watts
2 Ohm Stereo
Rated Power @ 14.4 V (0.2 % THD) : 2 x 160 Watts 2 x 240 Watts
4 Ohm Mono
Frequency Response : 20 –20,000 Hz ± 0.5dB 20 –20,000 Hz ± 0.5dB
Input Sensitivity: 0.1 – 5 V 0.1 – 5 V
S/N Ratio @ rated power : 100dB 100dB
High-Pass Filter Crossover Frequency : 30 – 300 Hz 30 – 300 Hz
(Continuously Variable, @18 dB/Oct.)
Low-Pass Filter Crossover Frequency : 30 – 300 Hz 30 – 300 Hz
(Continuously Variable, @ 18 dB/Oct.)
Bass Boost Level : 0 – 18dB @ 45 Hz 0 – 18dB @ 45 Hz
Dimensions: 11"W x 2
3
⁄8"H x 13
3
⁄16"L 11"W x 2
3
⁄8"H x 14
3
⁄8“L
(280 x 60 x 335mm) (280 x 60 x 365mm)
Due to continual product improvement, all specifications subject to change without notice.