Enclosure And Setup
9
Building an Enclosure
To work properly, the walls of the enclosure must be rigid and not flex when subjected to
high pressure generated by the speaker’s operation. For optimum performance, we recom-
mend using 3/4” MDF (Medium Density Fiberboard) and internal bracing. The enclosure
should be glued together along with support of screws or nails. Because MDF is porous, it
is suggested that you seal the outside with polyurethane prior to painting or carpeting.
Calculating Volume
Calculating is merely a matter of measuring the dimensions in inches, and using the follow-
ing formula:
Box Volume = (Height) x (Width) x (Depth) divided by 1728. This will give you the volume
of the box in cubic feet.
If two facing sides are uneven length, add them together, and divide by 2 to take the aver-
age. Using this number will give you the volume without the necessity of calculating the
box in sections, and adding the sections together. The thickness of the baffle material
reduces the internal volume so this must be subtracted from the outside dimensions to
determine the internal volume. The amount of air displaced by each model is listed on the
specifications sheet in this manual and should also be subtracted from the gross volume
calculation. All box parameters include displacement for ports and subs. These specs do
not include the volume of the material used to bond the box, so this must still be factored
into the calculation.
Subwoofer Crossover
There are two operational types of crossovers, passive and active. Passive crossovers
(coils and conductors) are placed on the speaker leads between the amplifier and the
speaker. An active crossover is an electronic filter which separates the audio signal fed to
different amplifiers. For optimum subwoofer performance, we recommend using an active
80-100Hz low pass crossover at 12dB/octave.
Summary of Contents for AW1000J
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