Audiovox AMP-591A User manual

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ModelAMP-591A
300WattStereoAmplifier

INDEX
Specifications .............................................................................1
Precautions ................................................................................2
Installation Instructions ..............................................................3
Wiring Instructions ................................................................4 - 5
Stereo and Mixed-Mono Input Wiring Diagram .........................6
Stereo and Mixed-Mono Output Wiring Diagram ......................7
Mono (Bridged) Input Wiring Diagram ...................................... 8
Mono (Bridged) Output Wiring Diagram ................................... 9
Operation ..........................................................................10 - 12
Warranty ..................................................................................13

HIGH PERFORMANCE STEREO AMPLIFIER
This power amplifier has been designed to provide high quality performance with
a minimum of maintenance. However, it's performance will only be as good as the
care and quality of components with which it is installed. We therefore advise that
you read these instructions very carefully to familiarize yourself with the product and
it's features.
Should you require assistance with the installation or wiring of this unit, please call
our toll-free "HELP" line at 1-800-645-4994 during the days/hours shown.
Monday-Friday
Saturday
8:30am-7:00pmEastern
9:00am-5:00pm Eastern
1-800-645-4994
HELP!
SPECIFICATIONS
-1-
*Due to continuing improvement, Audiovox reserves the right to change features and design without notice.
Maximum Output Power
Stereo Operation: 150 watts x 2
Mono Operation: 300 watts x 1
Output Power @ 1% T.H.D.
Stereo Operation: 100 watts RMS x 2
Mono Operation: 200 watts RMS x 1
Output Impedance: 2 - 8 ohms (stereo)
4 - 8 ohms (mono)
Frequency Response: 10 - 50,000 Hz. ± 1 dB
Channel Separation: 50 dB
Signal / Noise Ratio: 80 dB (A-Weighted)
Input Impedance: low-level 10K ohms
high-level 100 ohms
Input Sensitivity: low-level 200 mv. - 2 v.
high-level 2 - 10 v.
Filter Types: low-pass & high-pass
Filter Slope: 12 dB/octave
Filter Crossover: Low-pass: 30 - 120 Hz. (selectable)
High-pass: 120 - 800 Hz. (selectable)
Bass Boost: +10 dB @ 50 Hz.
Supply Voltage: 12 volts, negative ground
Fuse Rating: 20 amps.
Dimensions (W x H x D): 9" x 2-1/4" x 10-5/8"
230 mm x 57 mm x 270 mm

PRECAUTIONS
1. Although this unit is designed with built-in self-protection circuits, there may be a possibility of damage if it is not wired
correctly. Please follow the wiring instructions carefully for the type of system being used.
2. The last lead to be connected is the wire to the positive (+) terminal of the battery. Connect this wire only after having
completed and checked all other connections to the amplifier.
3. By nature of its design, a power amplifier generates heat and requires good air circulation around it to dissipate that
heat. Do not install the amplifier in an enclosed area which does not permit adequate air circulation. Should the
temperature of the unit rise too high, the internal thermal sensors will shut off operation until it has cooled down
sufficiently.
4. If fuse replacement is necessary, use only fuses of the same ampere rating as originally supplied with the unit. The
use of fuses with incorrect ratings may cause serious damage to the amplifier. If fuses blow consistently, carefully
check all electrical connections to the unit.
5. Supply of adequate battery voltage is critical to the proper operation of the power amplifier. The leads to the battery
and chassis ground must be of a thick enough gauge to provide this voltage to the amplifier. We recommend
#16 gauge wire or thicker (smaller gauge #) for the battery and ground leads.
6. Make certain that the speaker(s) to be used with this amplifier are capable of handling the output power (wattage)
of the unit. Use of speaker(s) not rated for the output of this amplifier may cause damage to or failure of the
speaker(s) for which Audiovox will not be liable.
-2-

INSTALLATION INSTRUCTIONS INSTALLATION DIAGRAM
1. Select a mounting area where the amplifier will
have sufficient air circulation for proper cooling.
Inadequate air circulation will cause the temperature
of the amplifier to rise and will trigger the
thermal protection mode.
2. Place the amplifier on the mounting surface
and mark the locations of the four mounting
holes as shown in the illustration.
3. Remove the amplifier and drill a 1/8" hole at
each of the four locations.
CAUTION: Before drilling the holes, look at the
underside of the mounting surface. Always
check carefully to avoid drilling into wiring,
braces, fuel or brake lines. CHECK BEFORE
YOU DRILL !
4. Secure the amplifier to the mounting surface
using the self-tapping screws provided.
MOUNTINGSURFACE
1/8"DIA.HOLE
SELF-TAPPINGSCREW
SPLITWASHER
FLATWASHER
-3-

WIRING INSTRUCTIONS
The wiring of your amplifier will depend on the system and speakers you are using but will either be a stereo, mono, or
mixed-mono application. The following pages illustrate the input and output wiring for both types. Please refer to the
appropriate diagrams for the system configuration you are using.
The power and speaker wire connections for this amplifier are made via screw tightened terminal blocks. Loosen the
screw for the connection to be made and fully insert the wire (strip 1/2" of insulation from the end) into the respective screw
on the side panel (crimp-on "U" terminals are provided to simplify wiring and we recommend their use.) Tighten the screw
down to secure the wire.
1. Power Connection
The battery terminal (BATT) must be connected directly to the positive terminal of the vehicle battery to provide an
adequate voltage source and minimize noise. Connecting the battery terminal lead to any other point (such as the fuse
block) will reduce the power output and may cause noise and distortion. Use only #16 gauge or thicker (smaller gauge
#) wire for this lead and connect it to the terminal of the battery after all other wiring is completed.
2. Ground Connection
The ground terminal (GND) connection is also critical to the correct operation of the amplifier. Use a wire of the same
gauge as the power connection (#16 or thicker) and connect it between the ground terminal (GND) of the amplifier and
a metal part of the vehicle close to the mounting location. This wire should be as short as possible and any paint or
rust at the grounding point should be scraped away to provide a clean metal surface to which the end of the ground
wire can be screwed or bolted.
3. Remote Turn-On Connection
The amplifier is turned on by applying +12 volts to the remote turn-on terminal (REM). The wire lead to this terminal
should be connected to the "Auto-Antenna" lead from the car stereo which will provide the +12 volts only when the car
stereo is turned on. If the car stereo does not provide an Auto-Antenna lead, the remote turn-on lead may be wired
to an "Accessory" or "Radio" terminal in the car's fuse block. This will turn the amplifier on and off with the ignition key,
regardless of whether the car stereo is on or off. The remote turn-on lead does not carry large currents, so #20
gauge wire may be used for this application.
-4-

4. Speaker Connections
Depending on the type and number of speakers used with the amplifier, wire them to the speaker terminals as per the
appropriate wiring diagram. For most applications, #18 gauge wire should be used for the speaker leads but in no case
thinner than #20 gauge. For leads in excess of 10 feet, #16 gauge is recommended. When wiring the speakers, pay
careful attention to the polarity of the terminals on the speakers and make certain they correspond to the polarity of
the corresponding terminals on the amplifier. DO NOT ground any speaker leads to the chassis of the vehicle.
5. Input Connections
This amplifier features both high and low-level input capability. Use either the low-level or high-level inputs, not both.
If low-level outputs are provided from the car stereo, it is recommended that the low-level inputs be used for lowest
distortion and best performance. Use good quality shielded audio cables with RCA plugs at both ends to connect the
stereo to the amplifier and keep the cable lengths to a minimum to avoid noise.
If the car stereo does not provide low-level outputs, the amplifier may be connected via the speaker (high-level) outputs
from the stereo. Wire the speaker leads from the car stereo to the 5-pin adaptor harness as shown in the diagram
(shielded cable is not required for this application) and plug the connector into the mating High-Level Input socket on
the amplifier. Carefully splice and insulate all wire connections.
CAUTION: Use either the low-level or the high-level inputs on the amplifier.
DO NOT use both input levels at the same time.
WIRING INSTRUCTIONS
-5-

R
L
LOW INPUT
HPF LPF
STEREO AND MIXED-MONO INPUT WIRING DIAGRAM
-6-
5-PIN
CONNECTOR
IMPORTANT
USE EITHER HIGH-LEVEL OR
LOW-LEVEL INPUTS, NOT BOTH.
HIGH-LEVEL
(SPEAKER) OUTPUTS
CAR STEREO
USE THIS INPUT WIRING WITH
OUTPUT WIRING ON PAGE 7
RCA TYPE
SHIELDED CABLE
(NOT INCLUDED)
RIGHT+
RIGHT-
LEFT-
LEFT+
LOW-LEVEL
RCA OUTPUTS
GREEN
WHITE
GRAY
BROWN
LEFT
RIGHT
BLACK
CHASSISGROUNDONRADIO
PROT PWR
BASS BOOST X-OVER
GAIN
HI-INPUT

-
LEFT
SPEAKER
-
+
RIGHT
SPEAKER


+
STEREO MODE:2-8OHMS
MIXED-MONO MODE:4-8OHMS
STEREO MODE:2-8OHMS
MIXED-MONO MODE:4-8OHMS
STEREO AND MIXED-MONO OUTPUT WIRING DIAGRAM
-7-
AUTO-ANTENNA LEAD
USE #16 GAUGE
WIRE (SEE TEXT)
CAR STEREO
CONNECT THIS
WIRE LAST
USE THIS OUTPUT WIRING WITH
INPUT WIRING ON PAGE 6
EXISTING SCREW OR BOLT
CLEAN PAINT, RUST, DIRT OR GREASE
FROM AREA FOR GOOD CONNECTION
GROUNDED METAL
SECTION OF VEHICLE
12 VOLT VEHICLE
BATTERY
CHASSIS
GROUND
MIXED-MONO SPEAKER OR
SUB-WOOFER WITH CROSSOVER
4-8 OHMS
-

+
BRIDGED
LEFT LEFT RIGHT RIGHT
20A
GND REM BATT
POWER FUSE SPEAKER OUT

R
L
LOW INPUT
HPF LPF
PROT PWR
BASS BOOST X-OVER
GAIN
-8-
MONO (BRIDGED) INPUT WIRING DIAGRAM
CAR STEREO
LOW-LEVEL
RCA OUTPUTS
"Y" RCA TYPE
SHIELDED CABLE
(NOT SUPPLIED)
TO2nd
AMPLIFIER
IMPORTANT
USE EITHER HIGH OR LOW-LEVEL
INPUTS, NOT BOTH.
HIGH-LEVEL
(SPEAKER) OUTPUTS
+
-
+
-
TO 2nd AMPLIFIER
5-PIN
CONNECTOR
USETHISINPUTWIRINGWITH
OUTPUTWIRINGONPAGE9
GREEN
WHITE
GRAY
BROWN
BLACK
CHASSIS GROUND ON RADIO
HI-INPUT

-9-
MONO (BRIDGED) OUTPUT WIRING DIAGRAM
USETHISOUTPUTWIRINGWITH
INPUTWIRINGONPAGE8
AUTO-ANTENNA LEAD
USE #16 GAUGE
WIRE (SEE TEXT)
CAR STEREO
CONNECT THIS
WIRE LAST
EXISTING SCREW OR BOLT
CLEAN PAINT, RUST, DIRT OR GREASE
FROM AREA FOR GOOD CONNECTION
GROUNDED METAL
SECTION OF VEHICLE
12 VOLT VEHICLE
BATTERY
CHASSIS
GROUND
BRIDGED
LEFT LEFT RIGHT RIGHT
20A
GND REM BATT
POWER FUSE SPEAKER OUT


-
+
MONO SPEAKER
OR
SUB-WOOFER
4 - 8 OHMS

R
L
LOW INPUT
HPF LPF
PROT PWR
BASS BOOST X-OVER
GAIN
HI-INPUT
BRIDGED
LEFT LEFT RIGHT RIGHT
20A
GND REM BATT
POWER FUSE SPEAKER OUT
-10-
OPERATION
After initial set-up, the amplifier should not require any
further adjustment unless there is a change in the car
stereo or speaker system with which it is used.
1Power Indicator LED
The Power Indicator LED will light to indicate that
the unit is connected to the battery and that the Remote
Turn-On terminal is receiving +12 volts, thus turning
on the amplifier.
2Protection Mode LED
This LED illuminates red to indicate that the self-protection
circuits have been activated and have shut off operation
of the amplifier. The protection circuits may be triggered
by the temperature of the unit rising above a safe level
or by an overload condition. If activated by a rise in
temperature, the unit will resume operation after cooling
off to a normal operating range. If activated by an
7
2
3 4 1
6 5
8

-11-
overload condition, the source of the overload must
be found and corrected to resume operation of the
amplifier. Most overload conditions are caused by
mis-wiring or operation into incorrect speaker loads.
Re-check all wiring and connections if this situation
occurs and correct as necessary.
3Level (Gain) Control
The amplifier is capable of operating from sources
supplying a wide range of input levels. The Level
control should initially be set to the mid-rotation position.
If it is found that there is not enough output even when
the volume control on the car stereo is at its maximum
setting, adjust the Level control to increase the output
from the system. If, however, there is still output from
the amplifier when the car stereo volume control is at its
minimum setting, or the output level increases too fast
with a small rotation of the volume control, adjust the
Level control to decrease the output from the system.
Once the correct setting is found, this control should not
require any further adjustment.
4Crossover Selector
This switch allows selection of the frequency filters that
permit the amplifier to be used to reproduce the entire
audio range, just the bass range or just the midrange/treble
range as follows.
"FULL" Position: In this position of the switch, the
response is flat and unaffected so the entire
audio frequency range is reproduced by the
amplifier. Use this setting if the amplifier is
being used to power a full range speaker system.
"LPF" Position: In the "LPF" (Low-Pass Filter) setting,
only the bass frequencies below the frequency set
by the LPF Crossover Frequency Control 5will
be amplified and fed to the speakers. Use this
setting if the amplifier is being used to power a
sub-woofer speaker system.
"HPF" Position: In the "HPF" (High-Pass Filter) setting,
only the midrange/treble frequencies above the
frequency set by the HPF Crossover Frequency
Control 6will be amplified and fed to the speakers.
Use this setting if the amplifier is being used to
power a midrange/tweeter speaker system.
5LPF Crossover Frequency Control
This Control selects the crossover frequency when the
Crossover Selector 4is in the "LPF" setting. Adjust it to
the appropriate position for the characteristics and
crossover frequency requirements of the speaker system
with which the amplifier is being used.
6HPF Crossover Frequency Control
This Control selects the crossover frequency when the

Crossover Selector 4is in the "HPF" setting. Adjust it to
the appropriate position for the characteristics and
crossover frequency requirements of the speaker system
with which the amplifier is being used.
7Bass Boost Switch
This switch is used to accentuate the bass frequencies
by adding 10 dB of boost to the signal (at 50 Hz.).
-12-
8Fuse
The circuitry of the amplifier is protected from damage
by an automotive-type fast-blow fuse. If fuse replacement
is necessary, use only fuses of the same ampere rating
as originally supplied with the unit. The use of fuses with
incorrect ratings may cause serious damage to the amplifier.
If fuses blow consistently, carefully check all electrical
connections to the unit.

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 90 days 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.
After the initial 90 day period and for a period of 12 months from the date of original purchase, the Company will supply at no charge a
replacement for any defective part(s) but will charge for the labor to repair the product.
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 an approved warranty station or the Company at the address shown below.
This Warranty does not extend to the elimination of externally generated static or noise, to correction of antenna problems, to costs incurred
for installation, removal or reinstallation of the product, or damage to tapes, compact discs, speakers, 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). 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.
90 DAY/12 MONTH LIMITED WARRANTY
Applies to car stereo power amplifiers, equalizers and accessories.
CANADA: CALL 1-800-645-4994 FOR LOCATION OF WARRANTY STATION SERVING YOUR AREA
U.S.A. : AUDIOVOX CORPORATION, 150 MARCUS BLVD., HAUPPAUGE, NEW YORK 11788  1-800-645-4994
-13-
128-5422A