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PS475
Troubleshooting
Problem
Possible Cause
Amplifier does
No power to +12V terminal
not turn on
No power to REM terminal
Blown main fuse at battery
Blown fuse at amplifier
Faulty ground
Volume control
Input level control adjusted too
too sensitive
high
Distorted sound
Input level control adjusted too
high
Blows fuse(s) at
Power wires connected back-
amp
wards
Internal problem with amp
Engine noise /
Ground loop(s)
Alternator whine
Faulty ground at amp
Faulty ground at head unit
Inductive coupling
Input level on amp set too high Readjust input level (refer to page 9)
Thermal protec-
Amplifier driving 2 ohm load or
tion activated
bridged mono for long dura-
tions
Short circuit pro-
Blown speakers
tection activated
Speaker wire(s) shorting to
ground
Defective crossover
Low impedance
Amp connected to improper
protection acti-
load
vated
Amp will not drive a 2 ohm
mono load, 4 ohm minimum in
mono configuration
Speakers defective/blown
Faulty passive crossovers
Poor bass
Speakers out of phase
response
Note: If the protection light is activated with no speakers connected to the amplifier, and
all the power connections are correct, this would indicate an internal problem with the
amplifier.
Corrective Action
Check fuse(s)
Check head unit fuse(s) and wiring
Replace fuse and identify cause of failure
Replace fuse and identify cause of failure
Reground main power ground to bare metal
chassis
Readjust the input level (refer to page 9)
Readjust the input level (refer to page 9)
Reconnect power wires properly
Take unit for service
Use good quality shielded RCA cables
Reground amp to clean bare metal chassis
Reground head unit to clean bare metal chas-
sis
Reroute RCA and/or speaker wires away from
factory harnesses
If the amplifier "thermals" frequently while driv-
ing subwoofers, a fan may need to be
installed to keep amp cool
Check all speakers
Check for faulty wiring
Faulty passive crossover
Check speaker connections
Verify that speakers are connected properly
Check speakers
Check crossovers
Check speaker polarity; reverse the connec-
tion to one speaker only
Specifications
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Hz to 50kHz, - 3dB
Signal to Noise ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >110dB @ rated power (A-Weighted)
Channel separation @ reference power (1 watt/4-ohm load) . . . . . . . . . . . . . . . . . . . . >60dB @ 1kHz
Input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47k ohm
Speaker impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 4 ohms
Bass boost center frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Hz
Bass boost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +18dB
Crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuously adjustable from 40Hz to 400Hz
Type: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . State Variable
Slope: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12dB/octave, Butterworth
Power requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4VDC (10.8 - 15.6VDC allowable)
Current requirement: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 amp (2X25 amp)
RMS power output @ 14.4VDC, 20Hz - 20kHz
4-channel 4-ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 watts @ < 0.5% THD+N
4-channel 2-ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 watts @ < 1.0% THD+N
Bridged Stereo. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 watts @ <1.0% THD+N
Dimensions/mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333x302x55.5
Specifications subject to change without notice.
12-Month Limited Warranty
AUDIOVOX CORPORATION (the Company) warrants to the original retail purchaser of this product that
should this product or any part thereof, under normal use and conditions, be proven defective in material
or workmanship within 12 months from the date of original purchase, such defect(s) will be repaired or
replaced with new or reconditioned product (at the Company's option) without charge for parts and repair
labor. To obtain repair or replacement within the terms of this Warranty, the product is to be delivered with
proof of warranty coverage (e.g. dated bill of sale), specification of defect(s), transportation prepaid, to the
warranty center at the address shown below.
This Warranty does not extend to the elimination of car static or motor noise, to correction of antenna
problems, to costs incurred for installation, removal, or reinstallation of the product, or damage to tapes,
compact discs, accessories, or vehicle electrical systems. This Warranty does not apply to any product or
part thereof which, in the opinion of the Company, has suffered or been damaged through alteration,
improper installation, mishandling, misuse, neglect, accident, or by removal or defacement of the factory
serial number/bar code label(s) or markings. THE EXTENT OF THE COMPANY'S LIABILITY UNDER
THIS WARRANTY IS LIMITED TO THE REPAIR OR REPLACEMENT PROVIDED ABOVE AND, IN NO
EVENT, SHALL THE COMPANY'S LIABILITY EXCEED THE PURCHASE PRICE PAID BY PURCHASER
FOR THE PRODUCT.
This Warranty is in lieu of all other express warranties or liabilities. ANY IMPLIED WARRANTIES,
INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, SHALL BE LIMITED TO THE
DURATION OF THIS WRITTEN WARRANTY. ANY ACTION FOR BREACH OF ANY WARRANTY
HEREUNDER INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY MUST BE BROUGHT
WITHIN A PERIOD OF 30 MONTHS FROM DATE OF ORIGINAL PURCHASE. IN NO CASE SHALL THE
COMPANY BE LIABLE FOR ANY CONSEQUENTIAL OR INCIDENTAL DAMAGES FOR BREACH OF
THIS OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED, WHATSOEVER. No person or
representative is authorized to assume for the Company any liability other than expressed herein in
connection with the sale of this product.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of
incidental or consequential damage so the above limitations or exclusions may not apply to you. This
Warranty gives you specific legal rights and you may also have other rights which vary from state to state.
U.S.A: Audiovox Corporation, 150 Marcus Blvd., Hauppauge, NY 11788, 1-800-323-4815
CANADA: Call 1-800-323-4815 for location of warranty station serving your area.
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