™
F
O
R
T
H
E
L
O
V
E
O
F
M
U
S
I
C
MODEL 1752©
(1987 - MSRP $499.00)
OWNER’S OPERATION MANUAL AND
INSTALLATION GUIDE
INTRODUCTION
Power Supply: Self oscillating for reliability and efficiency. The transformer is
epoxy dipped for extreme vibration resistance. Banks of high-speed TO-3
switching transistors provide massive current reserves.
Output Stages: Transformerless, direct coupled and fully complimentary. Output
transistors are high current and low distortion TO-3 devices, operating at a
fraction of their limitations.
Protection: Our stable amplifier design is made virtually indestructible by three
protection circuits. One is a precision thermal protection circuit, which prevents
damage from high frequency oscillation, or an excessive ambient temperature.
The second protection circuit is a current sensing device guarding against
instantaneous abnormalities, such as short circuits. Both of these circuits
automatically reset. The third form of protection guards against component
damage from reversed power connections.
Construction Features: Our unique, variable input sensitivity control permits
optimal signal matching for lowest noise and lowest distortion with virtually any
source. All components used are rated for at least 150% of their intended use,
and are mounted on double-sided fiberglass epoxy circuit boards.
Quality Control: In-house construction of critical components like transformer
and chassis, as well as total assembly, allows LINEAR POWER™ to maintain
uniform quality. 100% of the finished units are tested, then burned in for four
hours, and tested again. Amplifiers, which pass this rigorous test, have truly
earned the LINEAR POWER™ logo.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
1
INSTRUCTIONS
Read the following instructions through completely. If they appear to complex, we
recommend you have an authorized LINEAR POWER™ dealer do the work.
MOUNTING
1. The amplifier works 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 onto the case.
2. Mount the amplifier in a position that allows ample room for gain adjustments,
and the installation, removal and attachment of leads.
3. 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.
WIRING
1. Disconnect the negative ground cable from your vehicle's battery before
making any power connections to your amplifier.
2. Connect the black negative power wires from the amp to a solid frame
member via a bolt or self-tapping screw. This connection must be to a clean,
unpainted surface. Always attach the ground wire first when installing this
amplifier, and disconnect the ground last when removing this amp from the
system.
3. Two fuses of the proper size must be installed in line with the main power in
order to prevent damage to your wiring. They should be connected within 18
inches of the battery on the positive terminal. Use the fuse holders and fuses
provided, and replace only with the same size fuses. The Model 1752© uses two
AGC 30 fuses. Do not install fuses until you have completed installing the
amplifier.
WARNING: USE OF OVERSIZE FUSES WILL DAMAGE YOUR AMPLIFIER
4. The other end of the fuse holders should be connected to the positive power
wire from the amplifier. To extend the length of the power lead, use two 12 gauge
wires or larger to reduce power loss. A single 8 gauge or larger wire may be
substituted, but don't use smaller wires.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
2
5. The red and white wire acts as an electrical switch to turn the amplifier on and off. It
should be connected to the power antenna lead from the radio. Where no power
antenna lead exists, a source of 12 volts connected through a toggle switch will do. Do
not connect the red and white wire directly to a source that will leave the amplifier
permanently on as this will drain the battery.
6. The RCA (Phono) jacks will accommodate either high or low level signals, ranging
from 200 mV to 5 volts. For low-level signals, always use shielded cable and avoid
routing signal cables in the vicinity of any power wires. The center pin of the RCA plug is
ALWAYS the positive input connection.
7. As shipped from the factory, the Model 2202 will be set up as a normal stereo
amplifier, and ready for a 4 ohm load on each channel. If you wish to engage one of the
optional functions of this amplifier, remove the main power fuses to avoid the risk of
electrical shock from the high voltage present inside the case of the amp, then remove
the bottom cover.
BRIDGED MONO OPERATION
Locate the switch mounted on the printed circuit board near the speaker connector
marked: "St(Stereo) orBr(Bridged)." Move to "Br/Bridged" position. The left positive
speaker wire is now the + speaker output, with the right positive speaker wire becoming
the - speaker output. The two negative speaker outputs will not be used. The Right RCA
input is nonfunctional with the amp switched to bridged mode. The Left and the Right
RCA input cables should be “Y”d together (summed mono signal input) and inserted in
the Left RCA input only.
The wiring for the bridged mono mode is as follows:
With the connector end of the amplifier facing you, top side up, the speaker terminal
block is arranged: LEFT (-); LEFT (+); RIGHT (+); RIGHT (-). The mono mode uses the
LEFT (+) and RIGHT (+) connections. An electronic crossover, such as the XO3, should
be used to limit the frequency range to the input of the amplifier for best results.
TWO-OHM CAPABILITY
Unplug the two jumper wires near the four large filter capacitors from the lugs marked 4
ohm and press them firmly back onto lugs marked 2 ohm. This will allow the amplifier to
operate into a 2-ohm stereo load on each channel, or a 4-ohm mono load when used in
bridged mono mode.
SPEAKER OUTPUT - MODEL 2202
The output current capability of the 2202 exceeds the rating of standard speaker plugs.
To ensure a good connection with this much power, a terminal strip is used. The
speaker cables can be brought directly to the amplifier and connected as follows
for stereo use: LEFT (-); LEFT (+); RIGHT (+); RIGHT (-).
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
3
OPERATION / ADJUSTMENT
For any system to operate at minimum distortion with minimum noise and still
reach full power output, the equipment should be aligned to operate at the same
point on the distortion curve at the same time. In a basic system, using a single
amplifier, set the amp sensitivity adjustment to minimum, turn the deck up until it
just starts to distort, then back down slightly. This is the point where the output of
the deck is cleanest. Now, bring the sensitivity control of the amp up until it just
starts to distort, and back it down slightly. This will allow the amp and the deck to
reach maximum usable output at the same time.
GENERAL TROUBLESHOOTING
NO SOUND
Check all connections. Check main power fuses. Check accessory fuse. With a
trouble light or meter, be sure +12v is present at the amplifier on the power wires
and the red/white turn-on wire. Check for a good ground connection. Check by
substitution, or other method, for proper operation of music source.
BLOWS FUSES
check all connections to be sure power wires and speaker wires do not touch
each other or ground. Re-check polarity of main power wires. Check impedance
of speaker loads and setting of the internal power taps to insure proper match.
SHUTS OFF
As this amplifier is equipped with thermal and short circuit shut-down electronics,
in the event of high ambient temperature or improper speaker impedances, the
amp will turn itself off. To avoid damage to speakers, turn down the volume while
waiting for the amp to turn itself back on. If this occurs repeatedly, use a fan to
cool the amplifier and check for proper speaker loads and connections.
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 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
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
4
SPECIFICATIONS
1752©
RATING
Minimum continuous average power output
per channel both channels driven, from
20HZ to 20KHZ with no more than 0.09%
total harmonic distortion
Bridged mono power ratings
(14.4Volts DC operation)
Frequency Response +-1dB
Signal to noise ratio
(A-weighted)
Damping factor @ 4 Ohms
Input sensitivity for rated output at
minimum and maximum gain settings
Maximum rated current
Input impedance
Rise time
(Slew rate)
Dimensions
Fuse Rating (2 x 30 Amp AGC)
4 OHM
2 OHM
87.5
87.5**
250 (8 ohm spkr)
250**(4 ohm spkr)
19HZ to 30KHz
95 or greater
210 at all frequencies
150 mV to 5V
38A
50A
50K OHM
16v/micro Second
3.0"H x 9.5 "W x 9.75"L
60 A
** 2-ohm power rating is tested with the power supply taps in the 2-ohm setting,
leaving the taps in the 4 ohm setting will generate considerable additional power
however it is not suggested or recommended.
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
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
5
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
6
">
