Linear Power 652IQ Programming manual

F O R T H E L O V E O F M U S I C
™
MODEL 652IQ©
(1991-MSRP $219.00)
OWNER'S MANUAL AND
INSTALLATION GUIDE
INTRODUCTION
Latest technology, high sound quality, powerful delivery, and LINEAR POWER™
reliability all describe LINEAR POWER™ low profile amplifiers. With new "IQ"©
circuitry, their value increases. Versatile capabilities such as stereo, mono or
mixed stereo/mono operation and 2 ohm capability make these amplifiers
extremely desirable as the foundation of a multi-amplifier system.
TECHNICAL DESCRIPTION
The "IQ"©series amplifiers are low profile inverted channel ("I") amplifiers. A
quiet turn on circuit ("Q") has been added for improved performance. The
amplifier design incorporates an unregulated power supply for increased dynamic
headroom efficiency. The output stages of the 652IQ©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.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
1

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.
SPEAKER CONNECTIONS: Slide wire into plug, with wires going down from
plug connections should be as follows: (From Left to Right): first slot Left (-),
second slot Left (+), Third slot Right (-) and fourth slot Right (+) (except 302IQ©
the terminal strip is in the same order from left to right.) For mono operation use
Left (+) and Right (-). These amplifiers are capable of 2-ohm operation in stereo
or 4 ohms in mono. (See diagrams on next page)
OPERATING THE AMPLIFIER AT LESS THAN THESE RATINGS WILL
CAUSE AMPLIFIER FAILURE AND VOID YOUR WARRANTY.
NOTE: The 652IQ©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.
IMPROPER FUSING WILL DAMAGE YOUR AMPLIFIER!
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
2

BRIDGED MONO OPERATION:
The Model 652IQ©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. (See diagrams
on next page)
2-Channel Stereo and Bridged/Mono Operational Diagrams
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
3

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. (See diagram on next page)
3-CHANNEL OPERATIONAL DIAGRAM
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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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.
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 652IQ©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
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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type. The 652IQ©uses 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!
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
[phone]
E-mail: [email protected]
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© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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Specifications
652IQ©
Power output @ 4 ohms RMS @ 12.5 volts 32.5X2
THD @ full output 20-20KHz .06%
Slew Rate volts/microsecond 9Vms
Damping factor @ 4 ohms >100
Channel separation 60dB
Maximum current
4 ohms 8A
2 ohms 12A
Idle .7A
Fuse rating (12 Volt Power Feed) 10A
Dimensions 2x7.7x5.5
Internal Speaker Fuse ratings 5 A
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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™
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