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Thank you for purchasing this FLI UNDERGROUND amplifi er. It will provide you with years of trouble free usage providing you follow a few simple guidelines. INTRODUCTION This instruction manual is for your safety and must be adhered to at all times. Please read and ensure that you fully understand the installation and set up procedures as explained.
AMplifier Installation Your FLI UNDERGROUND amplifi er is designed with a swift installation routine in mind. Please mount the amplifi er in a dry location on a solid surface. NEVER mount the amplifi er upside down, this will cause the amplifi er to over heat and will eventually damage the amplifi...
ground cable • The ground cable needs to carry the same current as the power cable. At least an 8 gauge cable should be used. • The amplifi er ground should be connected directly to the chassis of the vehicle, to bare metal.
NOTE: BY USING THE CROSSOVERS CORRECTLY YOU WILL NOT ONLY LENGTHEN THE LIFE OF YOUR SPEAKERS BUT WILL ALSO GET BETTER PERFORMANCE FROM THEM. TO OPTIMISE YOUR SETUP SEEK THE ADVISE OF A PROFESSIONAL INSTALLATION ENGINEER OR VISIT YOUR LOCAL FLI AUDIO DEALER.
System Wiring Input connections Connect to remote turn-on Connect to lead of source unit chassis / ground SOURCE (HEAD UNIT) of vehicle FUSE BATTERY High level input When using a high level speaker input, use the supplied high to low level converter loom. WHITE WHITE/BLACK High to...
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System Wiring 4 Channel Stereo MIN. 2Ω MIN. 2Ω System Wiring 2 Channel Stereo, Bridged (mono) MIN. 2Ω MIN. 4Ω...
Troubleshooting Before removing the amplifi er, refer to the list below and follow the suggested procedure. Always test the speakers and confi rm that they are wired correctly fi rst. If in any doubt get help from a qualifi ed auto electrician. AMPLIFIER WILL NOT POWER UP •...
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AVAILABLE NOW IN THE FLI UNDERGROUND RANGE: UNDERGROUND up to up to speakers 270 watts 270 watts FU 4 FU 5 FU 6 FU 69 FU 5c FU 6c up to up to subwoofers 1200 watts 1200 watts FU 10 FU 12 FU 15 up to...