Linear Power LP50 Programming manual

F O R T H E L O V E O F M U S I C
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LP50©
OWNER'S MANUAL AND
INSTALLATION GUIDE
INTRODUCTION
You have purchased an amplifier that leads the way with sound quality, reliability,
and features. These high performance amplifiers deliver what you ask for:
smooth, effortless listening, or hard driving power to get you down the road.
LINEAR POWER™ has been a name recognized since 1975 as a product
delivering high quality and audio excellence. Now, you have the results of that
experience.
LP50©features include: frequency programmable high-pass, low-pass, or
bypass cross-over filter; high current, gold plated power connector, gold plated
5-way binding post speaker connections, panel mount fuse, high quality
components, bass and treble controls (Z models only, and LINEAR POWER™
reliability and commitment to excellence. Enjoy the Music!!
IMPORTANT NOTICE
The LP50©is NOT 2-ohm mono stable. While it may be used in 2-ohm stereo, if
you hook-up this amplifier in 2-ohm mono it will DAMAGE the unit and VOID
your warranty. For further information on this, or assistance to calculate your total
speaker load impedance, please call T.I.P.S. Inc. (see info under Service or
Repair heading)
CONTROLS and CONNECTIONS
Please read through this entire section before installing your amplifier in the
vehicle. Disconnect the negative (-) battery terminal in your vehicle and remove
the fuse from the amplifier before making or breaking any connections. Do not
install power line fuse at battery or amp until the installation of your amplifier is
complete.
1. Input connections: Connect with quality patch cords from the head unit,
preamplifier, crossover, or any other sound processor.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™is a trademark of Linear Power, Inc.
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2. Input level: This is NOT a volume control. The input sensitivity should be
adjusted to give you maximum output power while minimizing distortion. To set
the input sensitivity, first turn the amp input level control fully counterclockwise.
Turn the source output level up until the signal just starts to distort, and then turn
the source back down slightly so that the distortion goes away. Now rotate the
input level control on the amp clockwise until the signal just starts to distort, then
turn the amp input level control back down slightly so that the distortion goes
away. This setup procedure allows the source and amp to reach maximum clean
output at the same time. For maximum performance/power, the input voltage to
the amplifier should not exceed 6.5 V rms.
3. Speaker connections: These connections are high quality 5-way binding
posts. You may connect them with banana plugs, spade connectors, pins or bare
wire. For stereo connection of the amplifier, connect the positive speaker leads to
the red posts and the negative speaker leads to the black posts. For mono
connection of the amplifier, connect the speaker positive (+) to the left, red
binding post and the speaker negative (-) to the right, black binding post. The
amplifier is capable of being connected in mono and stereo at the same time, but
a passive crossover should be used.
The minimum recommended speaker load on the LP50©IS 2-ohm stereo or 4-
ohm mono. Unlike most car audio amplifiers, the LP50©is designed for
maximum power output into BOTH 4-ohm and 2-ohm stereo loads, as well as 4-
ohm mono. The LP50©is NOT 2-ohm mono stable. If you run a two-ohm
stereo or 4 ohm mono load you MUST change the internal power supply taps
(located near the toroid coil) to the settings marked 2. If you change the taps to
the settings marked 2 you must reset the gain adjustment. Failure to reset the
taps or reset the gain adjustment will cause failure of your amplifier and void your
warranty.
4. + 12V connection: Connect 8 AWG or larger power cable through an inline
fuse to the positive (+) terminal on the battery. Position the inline fuse within 18"
of the battery. The inline fuse should be the same style and rating as the fuse on
the amplifier. Be sure all connections are secure.
5. Ground Connection: Connect 8 AWG or larger power cable directly to a
clean bare metal surface on the car chassis. Use as short a cable run as
possible. Be sure all connections are secure.
6. Remote connection: Connect 18 AWG or larger wire to the remote turn-on
signal or power antenna signal from the source unit. If you do not have either of
these signals available, use the "ignition on" or "accessory" signal to drive a relay
that will connect the battery to the REM input on the amplifier when the key is in
the ignition. Be sure all connections are secure.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™is a trademark of Linear Power, Inc.
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7. Fuse: Remove the fuse from the amplifier before making or breaking any
connections in your installation. If you need to replace the fuse, use only a fuse
of the same style and amperage rating as that shipped with the amplifier (see
chart below). If the fuse blows, it is telling you there is something wrong. Please
listen. The LP50©uses an ATC 15 amp fuse.
8. Status indicators: The green LED indicates the amplifier power supply is
working. If the green LED is flashing, it is an indication that the +12V
connection is dipping below 10.5V dc, or that the speaker load is too low. The
yellow LED indicates the amplifier has shut down due to overheating. When the
amplifier has reached the correct operational temperature, it will turn itself back
on. The red LED indicates the amplifier has shut down due to too much current
through the output stage. This excessive current can be caused by speaker
shorts, too low of speaker loads, incorrect transformer configuration, or incorrect
input level setting. The REM signal must be shut off and turned back on before
the current protect will reset and allow the amplifier to operate.
9. Crossover: The LP50©amplifier has a built in programmable crossover filter.
You may select the high-pass, low-pass or bypass modes thru a switch on the
bottom of the amplifier located near the speaker connections. Remove the black
cap plug to gain access to the switch. If you select high-pass mode the amplifier
will play all frequencies from 80 Hz and up. If you select low-pass mode the
amplifier will play all frequencies from 80 Hz and down. All amplifiers are shipped
in the bypass mode that disconnects both the input and output of the crossover
filter from the audio path. You can change the cutoff frequency from 80 Hz by
purchasing optional frequency selector chips and installing them in the place of
the 80 Hz chips. Frequencies available are 60 Hz, 70 Hz, 105 Hz, 160 Hz, 210
Hz, 285 Hz, and 340 Hz. The optional chips are available from your dealer.
MOUNTING
1. The amplifier will work best if it is kept as cool as possible. Mount the amp in a
position that will allow air to flow freely through the fins. Hot air rises, so orienting
the amp with the connectors facing the ground and the status indicators facing
the sky is the ideal mounting position. The amplifier should not be mounted
upside down. Be sure there is ample space above the amplifier to avoid trapping
heated air against the heat sink.
2. The heat sink of your amplifier is designed to act as a noise shield. To
maintain this protection, be sure the metal case of the amplifier does not touch
any metal in the car. Do not remove or damage the rubber grommets that provide
electrical insulation and vibration isolation. Avoid mounting the amplifier in the
dash or on the firewall where sources of noise such as your alternator,
windshield wiper motor, and air conditioner radiate the most energy.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™is a trademark of Linear Power, Inc.
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GENERAL TROUBLESHOOTING
No Sound: Check that the green power LED is on. If the green power indicator
is lit, check all signal input and speaker connections. If the green power LED is
not lit, check for +12 V dc on the +12 V and REM inputs and check for a solid
ground connection on the power connector. If yellow thermal LED or red
current LED is lit, see the status indicators portion of this manual.
Blows Fuses: Check all connections to be sure all power wires do not touch
ground or each other. Be sure power connections are not reversed. Check the
input level control for proper setting. Check for proper speaker impedance!
Noise Problems: Be sure the metal sleeve on the RCA (phono) jacks does not
touch the metal chassis of the vehicle, the heat sink of the amp, or the chassis of
any other components in your installation. Route signal cables away from power
wires, power connections, speaker wires, engine alternator, and vehicle firewall.
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
LP50©
RMS Power 4 Ohm @ 12.5v 25 x 2
Mono Power Rating 100 Watts
Channel Separation >80 dB
THD + Noise .06%
Slew Rate 8 volts/micro-second
Damping Factor (4-ohm/2-ohm) 200/100
Headroom 3 dB
Signal-to-Noise 95dB
Frequency Response 5Hz-350kHz
Dimensions 2.75”x11”x5”
Fusing 15 Amps
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™is a trademark of Linear Power, Inc.
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