Fli Audio FU10 - Manual (Page 4)

4
Sealed enclosure installation
The most basic and simple of all speaker enclosures is the sealed enclosure otherwise
referred to as an acoustic suspension design. They are called acoustic suspension
enclosures because the air inside the box acts like a brake to control the woofer. The
sealed enclosure is the easiest design to build and tune, as long as you work within the
minimum and maximum recommended volumes you cannot get it wrong. The smaller
enclosures produce a tighter punchy bass, the larger enclosures produce a deeper bass.
Sealed enclosures offer high power handling, tight response and smooth low end roll off and
cone motion is better controlled at all frequencies because of the constant pressure on the back
of the woofer.
Sealed enclosures are ideally suited to rock, jazz and live music.
ENCLOSURE CONSTRUCTION
Use at least 3/4 inch MDF (medium density fi breboard) or Birch ply to construct your enclosure. It is recommend
that the panels are glued, screwed and braced with sections of the same material you have used to build the
enclosure from.
The FLI UNDERGROUND woofer is capable of producing internal pressures that can literally blow apart badly
made enclosures, so great care needs to be taken with the construction and bracing of your enclosure. It is also
worth sealing the joints with a silicone sealer once the glue has dried to make a perfect airtight seal.
NOTE- DO NOT SCREW THE SUBWOOFER INTO THE ENCLOSURE WITHIN 24 HOURS OF APPLYING
SILICONE SEALER TO THE JOINTS. THE GASES GIVEN OFF AS THE SILICONE CURES CAN PERISH
THE SURROUND OF THE SUBWOOFER CAUSING A NON WARRANTY FAILURE.
PRODUCT TIGHT BASS DEEP BASS
FU 10 1.0 cu. ft. 1.5 cu. ft.
FU 12 1.5 cu. ft. 2.0 cu. ft.
FU 15 2.0 cu. ft. 2.5 cu. ft.
For twin enclosures simply double the volume. E.G. 2 x FLI 10 in deep bass enclosure
will be 3.00cuft