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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. If you are 

unclear on the installation or set up of your FLI UNDERGROUND subwoofer enclosure please 

contact your nearest authorised FLI UNDERGROUND dealer.

Thank you for purchasing this FLI UNDERGROUND subwoofer enclosure. It will 

provide you with years of trouble free usage providing you follow a few simple 

guidelines.

2

WARNING

DO NOT EXPOSE THIS PRODUCT TO DAMP OR MOISTURE

 - doing so may result in 

fi

 re, 

shock or damage to the product.

BEFORE WIRING DISCONNECT THE CABLE FROM THE POSITIVE BATTERY TERMINAL

 

- failure to do so may result in electric shock or injury.

ENSURE GOOD AND CORRECT CONNECTIONS

 - failure to make the correct connections 

may result in 

fi

 re or damage to the product.

KEEP THE VOLUME AT A LEVEL SO YOU CAN STILL HEAR OUTSIDE NOISE

 - failure to do 

this may result in an accident. FLI UNDERGROUND equipment is capable of producing sound 
levels that can permanently damage your hearing. FLI UNDERGROUND recommends caution 
when listening at high volume. For safe and enjoyable listening the sound should be comfortable 
and clear without distortion.

CAUTION

• Never connect any speaker lead to the car chassis. This can cause severe damage to your 

speaker / car radio / ampli

fi

 er. 

• Before drilling or cutting any holes, investigate the layout of your vehicle thoroughly.
• 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 catch on the speaker or grill (e.g. window or door handles, or 

window glass inside the door)

INSTALLATION

• The quality of the installation will affect the system performance and reliability.
• Contact your nearest authorised FLI dealer if you are unsure about the installation of this 

product.

• Please mount this unit away from any potential hazards.
• Minimising the length of wires will provide higher audio output from the system.
• The speaker should be securely fastened to the mounting position using the screws 

provided.

• Pre drill your mounting holes using a drill and position with the template provided.
• Be sure to investigate your mounting area thoroughly for electrical wires, brake or fuel lines or 

fuel tank to prevent causing any damage.

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ONNECTIONS

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Summary of Contents for UNDERGROUND FU10A

Page 1: ...UNDERGROUND INSTRUCTION INSTALLATION MANUAL MODEL FU10A FU12A FU12TA active enclosure...

Page 2: ...thoroughly 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 movi...

Page 3: ...put of it will increase as the suspension loosens up A new subwoofer is like a new car engine it needs a few thousand miles before you can drive it to its full potential driving it into the red line f...

Page 4: ...ith 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...

Page 5: ...attention as the power cable and taken back to the source headunit and joined to the remote cable provided If the source headunit does not have a remote turn on cable then a 12v supply should be used...

Page 6: ...TROL High pass frequency control The frequency ranges from 50hz to 250 Hz E BASS BOOST CONTROL To provide up to an extra 6 dB of bass boost at 45 Hz Use this boost to increase bass output from the amp...

Page 7: ...an be heard in any of the speakers or until the volume reaches an uncomfortable listening level when this is reached turn down the gain control slightly The gain control is now set The setting of the...

Page 8: ...8 System Wiring Input connections BATTERY FUSE Connect to chassis ground of vehicle Connect to remote turn on lead of source unit SOURCE HEAD UNIT...

Page 9: ...utomatically when the units temperature goes above 80 degrees If the amplifier feels very hot then this may be the reason for the amplifier not starting Check that there is good airflow around the amp...

Page 10: ...e for your future reference For more information and to register your warranty online visit www fliaudio com warranty Model Driver Amplifier RMS power Peak power Impedance Height Depth Width FU12TA FU...

Page 11: ...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 affiliate or their content and technology providers and...

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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