Linear Power 452i Manuel de programmation

MODEL 452i©

(1989-MSRP $250.00)

F O R T H E L O V E O F M U S I C

™

OWNER'S MANUAL AND

INSTALLATION GUIDE

TECHNICAL DESCRIPTION

The amplifier design incorporates an unregulated power supply for increased

dynamic headroom efficiency. The output stages of the Linear Power™452i©

amplifier will deliver a significant increase in power into 2-ohm stereo loads.

Amplifier reliability is accomplished by the amplifier operation level being set at

approximately 50% of output transistors' rated power handling, even at this lower

impedance load. The 452i©incorporates inverting capabilities on the right

channel, which allows the amplifier to bridge without the use of and external

bridging device such as a pre-amp or crossover. This feature will also allow the

amplifier to play in the channel mode.

WIRING

Disconnect battery ground cable before making any power connections.

RED WIRE: +12 volts. Connect directly to battery positive terminal and should be

fused within 18 inches of battery and another fuse where the connection to the

amplifier is made. Remember to use the proper size fuses. WARNING: USING

OVERSIZED FUSES IS DANGEROUS AND WILL VOID THE WARRANTY!

See specifications for proper fuse size. Do not install power fuse until amplifier

installation is complete.

BLACK WIRE: negative ground. Connect to clean, unpainted metal surface on

car chassis.

RED/WHITE WIRE: Remote turn on lead requires 12 volts; connect to power

antenna lead from radio. When this not available, you may connect to a +12 volts

wire that is on with the ignition on or in the accessory position.

RCA CONNECTIONS: Connect with quality-shielded patch cords from source,

crossover, or any other sound processor.

LINEAR POWER™ is a trademark of Linear Power, Inc.

SPEAKER CONNECTIONS: Screw wires onto connector block, with wires

attached as follows: (From Left to Right): first slot Left (-), second slot Left (+),

Third slot Right (-) and fourth slot Right (+) For mono operation use Left (+) and

Right (-). These amplifiers are capable of 2-ohm operation in stereo or 4 ohms

in mono.

OPERATING THE AMPLIFIER AT LESS THAN THESE RATINGS WILL

CAUSE AMPLIFIER FAILURE AND VOID YOUR WARRANTY.

NOTE: The 452i©have internal speaker protection fuses. If there is no output

from the amplifier, check these fuses, as your warranty does not cover their

replacement. Replace fuses only with fuses having the same rating. The

proper fuse is a GMA-5, 5-amp fuse per channel. Some later model amps may

use an ATC 5-amp fuse.

IMPROPER FUSING WILL DAMAGE YOUR AMPLIFIER!

2-Channel Stereo Operational Diagram

LINEAR POWER™ is a trademark of Linear Power, Inc.

THREE CHANNEL:

STEREO PLUS SINGLE SUBWOOFER

To build a single amp system with two satellites and a subwoofer, configure the

amplifier outputs as follows: Using 4-ohm satellite speakers, hook them up for

normal stereo operation as described above. Then, using a 4-ohm subwoofer

speaker, hook it up using the two CENTER connections on the terminal strip.

Follow the polarity of the strip as described in the section above. A second set of

satellites may be added for 2-ohm operation.

3-Channel Operational Diagram

LINEAR POWER™ is a trademark of Linear Power, Inc.

BRIDGED MONO OPERATION:

The Model 452i©is built with the right channel inverted. This allows the amplifier

to be used in a bridged mono configuration. Using an 8-ohm subwoofer speaker,

hook it up using the two CENTER connections on the terminal strip. Follow the

polarity of the strip as described in the section above.

This amplifier is capable of driving 4-ohm loads in the mono bridged mode. For

increased sound pressure levels, a 4-ohm load may be used. For systems

requiring higher sound quality, an 8-ohm load is recommended.

Bridged/Mono Operational Diagram

GAIN ADJUSTMENT

Set the amp gain to minimum, turn the source up until it just starts to distort, then

back down slightly. This is the point where the output of the source is cleanest.

Now adjust the amplifier gain up until it just starts to distort and back down

slightly. This will allow the source and amp to reach maximum usable output at

the same time.

LINEAR POWER™ is a trademark of Linear Power, Inc.

MOUNTING

1. The amplifier will work best if it is kept as cool as possible. Mount in a position

that allows air to flow freely through the fins. Be sure there is ample space above

the amplifier to avoid trapping heated air rising from the amplifier. The amplifier

should not be mounted upside down. Avoid mounting any amplifier in the dash or

on the firewall to avoid noises being radiated directly into the case.

2. The case of your amplifier is designed to act as a noise shield. To maintain

this protection, be sure the metal case of the amp does not touch the metal of the

car. Do not remove or damage the rubber grommets, which provide electrical

insulation and vibration isolation.

GENERAL TROUBLESHOOTING

NO SOUND: Check all connections. Check main power fuse. Check accessory

fuse of your vehicle. Check to see that +12Vdc is present at the amplifier on the

power wire, and on the red/white remote turn-on wire. Check for a solid ground

connection. Check that the main music source is putting out signal.

BLOWS FUSES: Check all connections to be sure no wires are touching each

other or the chassis of the vehicle or any other equipment in your install. Check

that your speakers are in proper working order.

SHUTS OFF: These amplifiers are equipped with a Thermal Shutdown System.

If the amplifier becomes too hot during operation, it will shutdown until it cools to

proper operating temperature. This can be caused by lack of proper air

circulation to the amp, or too low of speaker impedance.

INTERNAL SPEAKER FUSES

The 452i©is equipped with internal speaker fuses to protect these amps and

your speakers. If you lose operation of one or both channels in these amps, first

check all the connections. If the internal fuses need replacement, remove the

faceplate of the amp and replace the fuse(s) with one of the correct size and

type. The 452i©uses a GMA-5, 5 AMP style fuse. Later model amps may use an

ATC-5 style, 5-amp fuse. Check all speaker wiring, or the speaker to insure

against shorts, also check for proper speaker impedance.

Remember, the fuse did not fail without reason!

LINEAR POWER™ is a trademark of Linear Power, Inc.

SERVICE OR REPAIR

To obtain modification, service or repair, please contact our ONLY Authorized

LINEAR POWER™ Product Service Center:

T.I.P.S. INC.

3455 Lanell lane, Pearl, MS 39208

(601) 932-8477

E-mail: [email protected]

™

3 4 5 5 L A N EL L L A N E, P E A R L, M S 3 9 2 0 8 (6 0 1) 9 3 2 – 8 4 7 7

LINEAR POWER™ is a trademark of Linear Power, Inc.

Specifications

452i©

Power output @ 4 ohms RMS @ 12.5 volts 22.5X2

THD @ full output 20-20KHz .01%

Slew Rate volts/microsecond 8Vms

Damping factor @ 4 ohms/2 ohms >100/50

Channel separation 60dB

Maximum current

4 ohms 8A

2 ohms 12A

Idle .7A

Fuse rating (12 Volt Power Feed) 12A

Dimensions 2x7.7x5.5

Internal Speaker Fuse ratings 5 A

LINEAR POWER™ is a trademark of Linear Power, Inc.

™

3 4 5 5 L A N E L L L A N E, P E A R L , M S 3 9 2 0 8 (6 0 1) 9 3 2 - 8 4 7 7

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