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POWER PROTECT
L R L R
HI INPUT LOW INPUT PASS
®
How to Install and Operate Contents
the LXA300 Amplifier
Features ........................................ 2
Installation................................... 2
Before You Begin
Installation ..................................... 2
Amplifier Location .......................... 2
Disconnect Battery ........................2
• Amplifier Installation Kit .............2
Supplies and Tools
Needed ..........................................3
Routing Wires ..
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® LXA300 Features The Jensen LXA300 power amplifier is a two- • 150 watts RMS bridged into a 4 ohm load channel 300-watt total system power automotive • Bridgeable design to direct full power to one amplifier. The LXA300 includes: speaker • RCA inputs Audio Amplifiers • High level inputs Amplification offers two advantages: • Continuously variable low pass or high pass crossover • The LXA300 amplifier can make the sound • Bass boost feature of your receiver fuller and richer, even at low volume
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® LXA300 Supplies and Tools Needed Routing Wires Supplies: • Speaker wire (12 gauge for subwoofers, 16-18 Battery gauge for other speakers) Battery • Sheet metal type screws for mounting amplifier Connector • Electrical tape • Solderless crimp connectors Fuse or • 1/2" thick plywood or particle board to mount Circuit Breaker amplifier on Grommet To prevent Tools: damage to power wire • Flat and Phillips screwdrivers Receiver • Wire cutters • Wire strippers Power Wire • Cordless or standard ele
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30A 30A ® LXA300 Wiring Power and Outputs + 12V RMT GND FUSE L + L – R – R + POWER SPEAKER Power Terminal (BATT +12V) Remote Terminal (RMT +12V) Connect the radio power antenna lead from Connect directly to the vehicle battery+ the receiver to the amplifier REMOTE terminal. terminal with 8 gauge wire (minimum). This turns the amplifier on whenever the re- + 12V RMT GND ceiver is turned on. If a power antenna lead is not available, connect this wire to the radio or accessory fuse. + 12V RMT GND
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® LXA300 Inputs and Controls POWER PROTECT R L R L HI INPUT LOW INPUT PASS Input Wiring Pass Output Inputs may be high level (from the receiver's speaker) or low level (from special low level Use pass through (PASS outputs). Low level input is preferred for best OUTPUT) connectors for R performance. L adding other amplifiers. PASS Important Use only the low level or high level input, do Power Light not use both at one time. Low Level Input The power light comes on when 12 Use a pair of shielded
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® LXA300 Crossover (X-OVER) LEVEL BASS- BOOST Adjust the crossover to accommodate your chosen installation method. OFF ON • LPF–(low pass filter) only bass MIN MAX tones go to speakers. Use with woofers or subwoofer. LPF X-OVER • FULL–all tones go to speak- ers. Use with full-range speak- ers. LPF HPF 50 250 FULL • HPF–(high pass filter) blocks very low tones from the speak- HPF X-OVER ers. Use with 6" or smaller speakers. LPF HPF LPF FULL Use LPF and HPF to adjust from 50 250 50 to 250Hz. Wh
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® LXA300 Speaker Wiring 2 Speakers 2 Subwoofers RCA Cables RCA Cables 2/4Ω 2/4Ω 2/4Ω 2/4Ω L + L – R – R + L + L – R – R + X-OVER X-OVER LPF HPF FULL LPF HPF FULL 7
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® LXA300 2 Speakers + Subwoofer Bridged Subwoofer RCA Cables RCA Cables 2/4Ω 2/4Ω 4Ω 4Ω L + L – R – R + L + L – R – R + High Pass Filters X-OVER 4Ω minimum LPF HPF FULL Low Pass X-OVER Filter (available at most car stereo installation LPF HPF stores) FULL Important When running a subwoofer and two full-range speakers together (Tri-mode operation), high and low pass filters must be used. Failure to install these filters will damage your amp and/ or speakers. 8
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® LXA300 Testing 3 Before you finish the installation, you should do the following tests to make sure the wiring is correct and everything is operating properly. Reconnect Battery Professional Tip Dealing with Alternator Noise When wiring is complete, reconnect the battery The vehicle alternator can cause a “siren” negative terminal. sound in the speakers that changes with engine speed. To prevent alternator noise: • Do not bundle RCA cables with speaker or power wires • Do not run speaker wire
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® LXA300 Professional Tip Professional Tip Securing Wires Installing in Trunk When installing the amplifier in the trunk, run Be proud of your installation! Use wire ties to the power wires along the same path as the bundle wires together when possible. (But other vehicle wiring. Many cars have insulated never bundle speaker wires and power wires channels for wiring. You will have to remove together!) the door sill trim and the carpet. Professional Tip Crimp Connections Secure loose
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® LXA300 Troubleshooting Problem Possible Cause Corrective Action Amplifier does not operate No power to +12V terminal Repair wire or connections (power LED not on) when vehicle and radio are on No power to remote wire with radio on Check connections to radio with test light Fuse blown Check fuse Radio volume needs to be Input level control (gain control) Adjust input level control (gain control) turned up too high for amp adjusted too low to work Radio volume is too sensitive Input level contr
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Specifications LXA300 Amplifier Power output @ 14.4 VDC, 20-20 kHz ............ (4 ohms) 75 Watts per channel RMS, < 00.08% THD (2 ohms) 100 Watts per channel RMS, < 00.1% THD (4 ohms) bridged 200 Watts per channel RMS, < 00.1% THD Frequency Response .......................................................................................... 20 Hz-20 kHz ± 3 dB Signal to Noise Ratio @ Rated Power ....................................................................................>100 dB Channel Se
