Audiovox BTR120 User manual

Model AXT-120
120 Watt 2-Channel
Amplifier
OWNER'S
MANUAL

Specifications...........................................................................1
Precautions.............................................................................. 2
Installation Instructions............................................................ 3
Wiring Instructions.............................................................. 4 - 5
Input Wiring Diagram............................................................... 6
Output Wiring Diagram............................................................ 7
Operation................................................................................. 8
Warranty.................................................................................. 9
INDEX

Input Sensitivity: Low-level 200 mV. - 2 V.
High-level 2V - 10 V.
Supply Voltage: 12 volts, negative ground
Fuse Rating: 5 amps.
Dimensions (W X H X D): 8-5/8" X 2-1/8" X 3-15/16”
219 mm X 54.3 mm X 100 mm
Maximum Output Power: 120 Watts
30 watts RMS @ 4 Ohms
Output Impedance: 4-8 Ohms
Frequency Response: 20- 25,000Hz +/-1 dB
Channel Separation: 60 dB
Signal / Noise Ratio: 90 dB
Input Impedance: Low-level 10K Ohms
high-level 100 Ohms
* Due to continuing improvement, Audiovox reserves the right to change features and design without notice.
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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 so this unit, please call
our toll-free "HELP" line at 1-800-645-4994 during the days/hours shown.
HELP!
1-800-645-4994
Monday-Friday 8:30am - 7:00pm Eastern
Saturday 9:00am - 5:00pm Eastern
SPECIFICATIONS
HIGH PERFORMANCE STEREO AMPLIFIER

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 speakers to be used with this amplifier are capable of handing the output power (wattage) of
the unit. Use of speakers not rated for the output of this amplifier may cause damage to or failure of the speakers
for which Audiovox will not be liable.
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PRECAUTIONS
++

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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.
INSTALLATION INSTRUCTIONS
MOUNTING SURFACE
DRILL 1/8" HOLE
SCREW
INSTALLATION DIAGRAM

The wiring of your amplifier will depend on the system and speakers you are using but will either be a 4-Channel,
3-channel, 2-channel, or mixed-mono application. The following pages illustrate the input and output wiring for these
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) under 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.
#16
#16
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WIRING INSTRUCTIONS

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 harnesses as shown in the
diagram (shielded cable is not required for this application) and plug the connectors 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.
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WIRING INSTRUCTIONS

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INPUT WIRING DIAGRAM
IMPORTANT
USE EITHER HIGH-LEVEL OR
LOW-LEVEL INPUT, NOT BOTH.
CAR STEREO
HIGH-LEVEL (SPEAKER) INPUT
(WIRE SIDE VIEW) LOW-LEVEL INPUT
RCA TYPE SHIELDED
EXTENSION CABLES
(NOT INCLUDED)
12
Gray
Brown
Black
Green
White
HI-INPUTHI-INPUT
GNDGND
L +L + R +R +
LLRR
MINMIN MAXMAX
GAINGAIN
RR
LL
PWRPWR
Left
Right

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LEFT SPEAKER
CAR STEREO
GROUND
FUSEFUSE
REMBATT GND
LEFTRIGHT
BATTERY
FOR 12 VOLT USE ONLY AUTO-ANTENNA LEAD
USE # 16 GAUGE WIRE
RIGHT SPEAKER
3
GROUND METAL
SECTION OF VEHICLE
EXISTING SCREW OR BOLT CLEAN PAINT, RUST, DIRT
OR GREASE FROM AREA FOR GOOD CONNECTION.
OUTPUT WIRING DIAGRAM
WARNING!
NEVER COMBINE (BRIDGE ) OUTPUTS FOR USE WITH 2 SPEAKER.
NEVER GROUND NEGATIVE SPEAKER LEADS TO CHASSIS GROUND.
FAILURE TO WIRE CORRECTLY MAY CAUSE DAMAGE TO THE AMPLIFIER.

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Power Indicator Lamps
The Power Indicator Lamps 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.
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.
Level (Gain) Controls
The amplifier is capable of operating from sources
supplying a wide range of input levels. The Level controls
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, orthe output level increases too
fast with a small rotation ofthe volume control, adjust
the Level control to decrease the output from the
system. Once the correct setting is found, these
controls should not require any further adjustment.
Fuses
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 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.
3
1
2
OPERATION
HI-INPUTHI-INPUT
GNDGND
L +L + R +R+
LL RR
MINMIN MAXMAX
GAINGAIN
RR
LL
PWRPWR
FUSEFUSE
REMBATT GND
LEFTRIGHT
3
12