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Run in procedure

FLI UNDERGROUND recommends that you follow the run in procedure for the 
subwoofer detailed below.

When your subwoofer is used for the 

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 rst time naturally like most brand new items it is very 

stiff and rigid, it will take time for the moving parts of this subwoofer to loosen up before it 
will be ready to deliver its full potential.

For the 

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 rst 30 hours it is recommended that you play the subwoofer initially at low to medium

volumes, gradually increasing the volume level as time progresses. As a guide, if you listen to it for 
1 hour every day it will take a month for the speaker to run in properly. You will notice a big change 
in the sound of the subwoofer over this period, as the spider and surround begin to run in the sound 
will get deeper and punchier, also the output 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’ from the 

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 rst day will mean engine damage is certain and will not be 

covered by warranty and the same applies to the subwoofer. Failure to follow this simple procedure is the 
most common reason for a subwoofer to fail after a very short period of time.

Installation

The most common place to mount a bass enclosure is in the luggage compartment of the vehicle. Where in 
the luggage compartment it is mounted will have an effect on the sound produced allowing the user to tailor 
the sound to best suit their musical tastes. For example if the enclosure is mounted facing the rear bumper, 
the bass produced will be noticeably deeper than if it is 

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 red into the rear seat. 

Do not be afraid to experiment with positioning as a little time and effort can yield great improvements in 
sound.

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