Power Acoustik LT1920, LT620, LT720, LT980, LT480/2 Owner's Manual

Owner’s manual

LT480/2, LT620/2, LT980/2, LT1440/2

LT1920/2, LT720/4, LT960/4

LT-Series

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INTRODUCTION

Amplifier provide high-performance sound reinforcement for you mobile audio equipment.
It’s versatility enables compatibility with optional Equalizers, Frequency Dividing Network
Crossovers, and other audio processors in a customized system. The Multi-Mode bridging
capabilities allow flexibility in hosting several different speaker configurations.

To achieve optimum performance, it is highly recommended that you read this Owners
Manual defore beginning installation.

FEATURES

• FULL MOSFET POWER SUPPLY

• PWM CIRCUITRY

• FULL SELECTABLE CROSSOVER HI/FULL/LOW

• THREE WAY PROTECTION CIRCUIT

• 2 ohm STABLE STEREO

• TRI-MODE CAPABLE

• VARIABLE LOW PASS (30Hz~500Hz)

• VARIABLE HI PASS (50Hz~500Hz)

• VARIABLE 24dB BASS EQ

• VARIABLE SUBSONIC FILITER 30HZ- 175Hz

• FREQUENCY RESPONSE: 10Hz TO 30kHz

• S/N RATIO 98dB

• THD 0.02%

• SYSTEM DISTRESS INDICATOR

• 4 GUAGE POWER / GROUND CONNECTION

• DIAMOND CUT HEAT SINK

• GOLD PLATED RCA CONNECTORS

• LINE OUTPUT

• BLUE LIGHT SYSTEM

• TOP PANEL CONTROLS

WARNING

High powered audio systems in a vehicle are capable of generating “Live Concert” high
levels of sound pressure, Continued exposure to excessively high volume sound levels may
cause hearing loss or damage. Also, operation of a moter vehicle while listening to audio
equipment at high volume levels may impair your ability to hear external sounds such as;
horns, warning signals, or emergency vehicles, thus constituting to a potential traffic hazard.
In the interest of safety, Consumer Electronics recommends listening at lower vilume levels
while driving.

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PLANNING YOUR SYSTEM

Before beginning the installation, consider the following:
a. If you plan to expand your system by adding other components somrtime in the future,

ensure adequate space is left, and cooling requirements are met.

b. Should you use high or low inputs?

Your Amplifier has been designed to accept either High-Level (speaker outputs from your
radio) or Low-Level (Pre-Amp outputs from your radio) signal source.

If your radio/source is equipped with Pre-Amp outputs, it is possible to utilize them to drive
the Amplifier and connecting (Amplifier) to the 2 rear speakers. Then, use the built-in
power of your radio to drive the 2 front speakers.

NOTE:
DISTORTION LEVEL IS CONSIDERABLY LOWER FROM PRE-AMP (LOW LEVEL) OUTPUTS, THAN SPEAKER

(HIGH LEVEL) OUTPUTS.

C. Are your components matched? The peak power rating of your speakers must be equal

or greater than the Amplifier’s. They also must be 2-8 Ohms limpedance (This information
os normally printed on the speaker magnet).

d. Consider both the length of your leads, and routing when determining the mounting

location. Pre-Amp input Jacks requir a length of high quality shielded male to male RCA
patch cord.

MOUNTING YOUR AMPLIFIER

The mounting position of your Amplifier will have a great effect on its ability to dissipate the
heat generated during normal operation. It has ample heat sink for heat dissipation, and
also designed with a thermal shut-down (for heat protection) circuit, making air to be
directed over the cooling fins will improve heat dissipation dramatically. DO NOT enclose
the amplifier in a small box of cover it so that air cannot flow around fins.

Temperatures in car trunks have been measured as high as 175’F(80’c) in the summer time.
since the thermal shut-down point for the Amplifier is 185’F(85’c) it is easy to see that it must
be mounted for maximum cooling capability. To achieve maximum advantage of
convection ais flow in an enclosed trunk, mount the amplifier in a vertical position, on a
vertical surface.

Cooling requirements are considerably relaxed when mounting inside the passenger
compartment since the driver will not often allow temperatures to reach a critical point.
Floor mounting under the seat is usually satisfactory as long as there is at least 1 inch(2cm)
above the Amplifier’s fins for ventilation.

a. Select a suitable location that is convenient for mounting, is accessible for wiring, and

has ample room for air circulation and cooling.

b. Use the amplifier as a template to mark the mounting holes. Remove the Amplifier and

drill 4 holes. use extreme caution, inspect underneath surface before drilling.

c. Secure the Amplifier using the screws provided.

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LT980/2,1440/2.1920/2

Fig 1

WIRING CONNECTIONS

A. CONNECTING THE POWER (Fig.1)

CAUTION:
AS A PRECAUTION, IT IS ADVISABLE TO DISCONNECT THE VEHICLE’S BATTERY BEFORE MAKING CONNECTION
TO THE +12 VOLTS SUPPLY WIRING.

4/8 GAUGE(Thicker if planning for additional Amplifiers) wire is recommended both the
power and ground wires. 12 Gauge, for the remote ture-on wire. Both types are
available at most Mobile Audio Dealers or Installation Shops.

(1) GROUND: To Vehicle Chassis

To avoid unwanted ignition noise caused by ground loops, it is essential that the
Amplifier be grounded to a clean, bare, metal surface of the vehicles chassis.

NOTE:
GROUND WIRE SHOULD NOT BE EXTENDED MORE THAN 3 FT.(1 METER).

(2) +12Volt(Fused) Constant Power: To Battery (+)

Due to the power requirements of the Amplifier, this connection should be made
directly to the positive (+) terminal of battery. For safety measure, install an in-line Fuse
Holder (not included) as close to the battery positive (+) terminal as possible with an
ampere rating; not to exceed total value of fuses in Amp.

LT480/2, LT620/2, LT980/2, LT1440/2, LT1920/2
LT720/4, LT960/4

(3) Remote Turn-One Input : To Power Antenna output of Car Stereo

This Amplifier is turned “ON”remotely when the vehicle’s stereo is turned “ON”.

NOTE:
IF YOUR RADIO DOES NOT HAVE +12 VOLT OUTPUT LEAD WHEN THE RADIO IS TURNED ON,
THE “REM” TERMINAL ON THE AMPLIFIER CAN BE CONNECTED TO VEHICLE’S ACCESSORY CIRCUIT THAT IS LIVE
WHEN THE KEY IS “ON”.

MOEDL: LT480/2, LT620/2, LT980/2, LT1440/2, LT1920/2
MOEDL: LT720/4, LT960/4

B. VARIABLE LOW-PASS FILTER (30Hz-500Hz)

For use as a dedicated subwoofer channel, set filter switch to “LPF”. Adjust variable
crossover frequency with control as desired. The amplifier input circuit filters out
everything above 30Hz- 500Hz (dependent on the adjustment of the frequency control),
so only the deepest bass notes are amplified.

C. VARIABLE HIGH-PASS FILTER (50Hz-500Hz)

For use as a dedicated mid high rangd channel, set filter switch to “HPF”. The input
circuit filters out all frequencies below 50Hz - 500Hz.

D. BASS EQ

‘BASS EQ CONTROL’, the SUB SONIC filter frequency can can be adjusted from 60 Hz to a

maximum of 200Hz. In this setting, there is an available boost control of 0 to +24dB.

E. CONNECTING LOW LEVEL INPUTS (RCA Jacks)

Wire routing is CRITICAL for NOISE FREE PERFORMANCE. Observe the following:

1. Always use high quality RCA type shielded cables.

2. Always use the shortest lenght possible. If the cable is too long, make an “S” type
loop (not a coiled loop) in the center of the cable to take up any excess.

3. Never cut the shielded cable and re-splice it.

4. Never route any Amplifier input cables near or parallel to speaker outputs, high
energy ignition wires, or near computer controlled ignition circuit units Computer
units may be found behind or under the dash panel in late model cars).

POWER INDICATOR LED

This METER LAMP will illuminate when the amplifier is turned “ON”. If it fails to illuminate,
check the power connections to the Amplifier and fuses.

PROTECTION CIRCUIT

Should the Amplifier be “SHORT CIRCUITED” overloaded or overheated, the protect
circuit will “SHUT-DOWN” the Amplifier.

CAUTION
THIS AMPLIFIER IS DESIGNED TO OPERATE WITH A MINIMUMLOAD IMPEDANCE OF 2 OHMS IN STEREO,
OR 4 OHMS IN MONO )BRIDGED, MULTI-MODE) CONFIGURATION.
SUBJECTING TO IMPEDANCE’S LOWER THAN RECOMMENDED, MAY CONSTITUTE TO POTENTIAL DAMAGE TO THE
MOSFET POWER SUPPLY. FOLLOW INSTRUCTIONS ON SECTION. “WIRING CONNECTIONS” FOR FURTHER
INFORMATION.

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