AudioBahn Natural Sound Subwoofer AW1571T - Manual (Page 14)

Enclosures And Setup
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 recommend 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 following 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 average. 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 build 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 (colls 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 80-1 OOHz low pass crossover at 12/dB/octive.
12