Enclosure construction, Enclosure volume – Fli Audio FF10-F5 User Manual

Page 7

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ENCLOSURE CONSTRUCTION

BRACING RECOMMENDATIONS

ENCLOSURE VOLUME

Use at least 3/4 inch MDF (medium density fibreboard) or birch ply to construct your enclosure and at

least 1 inch is recommended for the baffle. 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

subwoofer 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 war-

ranty failure.

To calculate the volume required for your enclosure please refer to recommended enclosure volumes

specified for your subwoofer. These are listed in cubic feet. To convert cubic feet to litres multiply the

cubic feet by 28.3. If you use this formula calculating your enclosure size will be easy .1 cubic foot is

expressed as 12” x 12” x 12” = 1728 cubic inches

Enclosure construction

Use at least 3/4 inch MDF (medium density ﬁbreboard) or Birch ply to construct your enclosure

and at least 1 inch is recommended for the bafﬂe. 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 BlackAir 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.

Enclosure Volume

To work out the volume required for your enclosure please refer to recommended enclosure

volumes speciﬁed for your Subwoofer. These are listed in cubic feet. To convert cubic feet to

litres multiply the cubic feet by 28.3. If you use this formula calculating your enclosure size will

be easy .1 cubic foot is expressed as 12” x 12” x 12” = 1728 cubic inches

If we require a volume of 2.5cuft then we multiply this by 1728 2.5 x 1728= 4320 cubic inches.

We now take 2 known enclosure dimensions that we will use, e.g height and width and divide

this ﬁgure by them which will give us the depth, for example our height is 15”, our width is 20”.

So our depth is 14.4” for this enclosure.

Note : this formula is for the INTERNAL dimensions, please add the thickness of the material

used to construct the enclosure to the formula to give you the outside dimensions.

So assuming we are using 1 inch material we need to add 2 thicknesses to each internal

dimension to allow for material top and bottom, so the external dimensions for this enclosure

would be 17 x 22 x 16.4 inches.

The displacement of the woofer and the displacement of the port must also be added to the

required volume before you calculate the required sizes needed to build your enclosure.

NOTE- When using a port you must leave a gap at least equal to the shortest measurement of

the port between the rear of the enclosure and the port.

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