Coustic D-block - Manual (Page 13)

7. Amplifier shutting off and LED flashing off and on: This is an indication of
low or high voltage at the +BATT or the remote portion of the amp. Test the +BATT and the remote por-
tion of the amp with a digital multi-meter. If the voltage at either of these terminals is above 15volts or
below 11volts, consult an automotive electrical specialist. If voltage is consistently below 11volts, adding
a one-farad stiffening capacitor will solve the problem.
8. Whining noise that increases with acceleration: This is what is known as a
ground loop. To verify if the noise is being generated by a bad ground or the RCA cables, remove the RCA
cables from the amp (make sure they are shielded from touching the chassis) and turn the system back
on. If the noise persists, then the problem is ground related. If the noise stops, then it is being radiated
into the amp via the RCA cables. If the noise is being radiated by the RCA cables, simply re-route the
cables away from power cables–specifically the +BATT cable that is connected to the battery. If whining
noise is ground related then confirm that all ground cables are secure in the vehicle and free of corrosion.
Please see power and ground portion of this manual for correct system grounding instructions.
COUSTIC TECHNICAL SUPPORT 1.877.268.7842
COUSTIC amplifiers purchased in the USA from an authorized COUSTIC dealer are guaranteed against
defects in material and workmanship for the period of 1 year from the date purchased by the end user
if the product is installed by an authorized COUSTIC dealer, and 90 days if installed by the consumer.
Product found to be defective during that period will be repaired or replaced by COUSTIC at no charge.
This warranty is void if it is determined that unauthorized parties have attempted repairs or alterations
of any nature. Warranty does not extend to cosmetics or finish. Before presuming a defect is present in
the product, be certain that all related equipment and wiring is functioning properly. COUSTIC disclaims
any liability for other incurred damages resulting from product defects. Any expenses in the removal
and reinstallation of products are not covered by this warranty. COUSTIC’s total liability will not exceed
the purchase price of the product. If a defect is present, your authorized COUSTIC dealer may be able to
effect repairs.
• 1 Year Warranty against defects in materials and workmanship
(90 day Mitek Proof of Performance Pledge applies)
• 2 years if professionally installed by an authorized Coustic retailer.
Proof of purchase is required when requesting service, so please retain your sales receipt, and take a
moment to register your warranty on line @ www.Coustic.com.
LIMITED WARRANTY
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