Coustic 160SE owner manual Symptom, Probable Cause, Specifications

SYMPTOM

8.Whining noise when engine is running with noise varying with the accelerator (noise level varies with source unit volume control).

9.Constant level whining noise (most noise with source unit volume at minimum)

PROBABLE CAUSE

Reroute power cable from battery to source unit directly, bypassing the battery terminal in the fuse box.

Check power connections to be sure they are clean. Check ground connections to be sure the ground wire is in direct contact with the bare metal surface of the chassis (with that spot scraped clean of any paint).

Check for a ground loop in the system. Turn the system off and one by one change the ground connections

(by changing to a different contact point,scraping the level constant irrespective of metal clean of any paint, rust or grease). Turn the system on and check for whining noise after each ground change.

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SPECIFICATIONS:

160SE
Rated Power @ 14.4 V (0.1 % THD):	4 Ohm Stereo	2 x 40 Watts

CAUTION:

10.Radiated noise: crackling noise on FM which is not present when playing tape or CD (noise varying slightly with accelerator, but is present at all times)

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.

Check if the noise is actually radiated noise: Tune a portable radio to the same FM station. Move the portable radio close to the vehicle engine. If crackling noise comes from the portable radio, then the noise you have in your vehicle audio system is radiated noise.

Check with a VOM to make sure the antenna is really ground- ed 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.

Rated Power @ 14.4 V (0.1 % THD):	2	Ohm Stereo	2 x 80 Watts
Rated Power @ 14.4 V (0.2 % THD):	4	Ohm Mono	1 x 160 Watts

Frequency Response:	20	–20,000 Hz +/- 0.5 dB
Input Sensitivity:	0.1 – 5 V
S/N Ratio @ rated power:	100 dB
High-Pass Filter Crossover Frequency:	80	/ 120 Hz (18 dB/Oct.)
Low-Pass Filter Crossover Frequency:	80	/ 120 Hz (18 dB/Oct.)
Dimensions:	11" W X 2 3/8" X 7 1/4" L (280 X 60 X 185 mm)

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