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LIMITED WARRANTY

All FLI goods are covered by a full 12 months manufacturers warranty. Valid 
from the date of the original receipt and proof of purchase. In order to validate 
this warranty, the warranty card should be returned to FLI within seven days 
of the original purchase date. The original receipt and packaging should also 
be kept for this 12 month period.

If at any stage during the warranty period you have a problem with the product 
then it should be returned to the point of purchase in its original packaging, 
complete and with no items missing. If the store is unable to 

fi

 x the product it 

may have to be returned to FLI this process takes around 7 working days. 

A full description of FLI’s warranty information can be found on our website:
www.

fl

 iaudio.co.uk/warranty

A written version can also be obtained from:
FLI warranty department
PO Box 11000
B75 7WG

COPYRIGHT

All content included in this manual such as text, graphics, logos, icons, images data, the selection 
and arrangement thereof, are the property of FLI Audio (herein referred to as “FLI”, “us” or “we”) 
and its af

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 liate or their content and technology providers, and are protected by United Kingdom 

and International copyright laws. All rights reserved. 

TRADEMARKS

FLI UNDERGROUND™, FU™, UNDERGROUND™ and all stylised representations of product 
names, or the abbreviations of product names, as logos are all trademarks of FLI. Graphics and 
logos are trademarks or trade dress of FLI Audio or its subsidiaries. FLI’s trademarks and trade 
dress may not be used in connection with any product or service that is not FLI’s, in any manner 
that is likely to cause confusion among customers or in any manner that disparages or discredits 
FLI. All other trademarks not owned by FLI or its subsidiaries that appear in this manual are the 
property of their respective owners, who may or may not be af

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 liated with, connected to, or 

sponsored by FLI or its subsidiaries.

We reserve the right to make needed changes or improvements to the product 
and this manual, without informing the customer about this in advance.

11

Summary of Contents for UNDERGROUND FU720.4

Page 1: ...UNDERGROUND INSTRUCTION INSTALLATION MANUAL MODEL FU720 4 AMPLIFIER FU720 4...

Page 2: ...y Use caution when working near the fuel hydraulic lines and electrical wiring Observe the correct polarity when wiring improper phasing may cause a loss of bass response Ensure that no moving parts c...

Page 3: ...th the power cable and is no further than eighteen inches away from the battery Please ensure that the fuse is not fitted until the entire installation procedure is complete The two tables below are t...

Page 4: ...flatten the car battery RCA Cables Depending on the model number of your amplifier and the number of speakers you wish to power you will have to run either one or two RCA cables from the source to th...

Page 5: ...tection mode the light will illuminate red Set Up Section To correctly set the gain control of the amplifier to match that of the source headunit use the following setup routine Turn the gain control...

Page 6: ...he supplied high to low level converter loom BATTERY FUSE Connect to chassis ground of vehicle SOURCE HEAD UNIT Connect to remote turn on lead of source unit SOURCE HEAD UNIT High to Low Level convert...

Page 7: ...7 System Wiring 4 Channel Stereo System Wiring 2 Channel Stereo Bridged mono MIN 2 MIN 2 MIN 2 MIN 4...

Page 8: ...res and reset the amplifier If the protection LED still comes on then the amplifier is faulty This damage may have been caused by either failure to follow these setup guidelines or abuse AMPLIFIER GET...

Page 9: ...9 notes...

Page 10: ...ype 2 1 channel 4 3 2 channel monoblock 5 4 3 channel Class AB AB D AB 4 ohm stereo 2 x 70 watts RMS 4 x 70 watts RMS N A 4 x 70 watts RMS 2 ohm stereo 2 x 90 watts RMS 4 x 90 watts RMS N A 4 x 90 wat...

Page 11: ...raphics logos icons images data the selection and arrangement thereof are the property of FLI Audio herein referred to as FLI us or we and its affiliate or their content and technology providers and a...

Page 12: ...watts 270 watts speakers FU 4 FU 5 FU 6 FU 69 FU 5c FU 6c FU 10 FU 12 FU 15 FU 360 FU 720 FU 1000 1 FU 1000 5 FU 10P FU 10A FU 12P FU 12A FU 12TP FU 12TA up to up to 1200 watts 1200 watts up to up to...

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