The sound of the system is somewhat tunable, via changes to the
port length. As we learned in the Why Go Ported section, the port
area needs to be in proper ratio to the cone area, so the DDBox
system uses variations to the port length as primary means of
tuning frequency mods.
Refer to the DDBox site chart to 23" long. This will
enable a DDBox/sub combo to have effective bass response in the
car, down into the low 30s. The DDBox plays all types of music very
well and is a perfect tune to begin advanced dial in of your system
after the subs break in.
The breakin period refers to the time it takes for the speaker's
spiders to loosen up, allowing more excursion. We build speakers
with very strong suspensions so they can be enjoyed for years, as
they loosen, the bass will become deeper and louder.
After the break-in, the tuning frequency can be lowered by
adding length to the port, try 4 inch increments. Conversely, the
tuning can be raised by shortening the port.
Step 4.1: Variations on tuning
Some users have specific, frequency enhanced, types of music
they like to play. Some even like the way body panels, windshields
and non-cartilage types of body parts flex to the beat, some cars
offer a complete beat down to those occupants. These applications
might skip straight to a longer port length, adding 6 inches to the
tuning frequency charts. Some upper frequency response in the
60-80Hz range may be affected.
This added port length also works well for applications where
there is poor acoustic loading in the vehicle, or in open room
applications like DJ systems and home applications. The increased
port mass helps to enhance the low frequency extension.
Some users would like to cut down on box volume knowing their DD
system exceeds their dynamic range expectations. The port area can
be reduced by 25%, to 12 square inches per cubic foot and using the
lower range of DDBox sizes for a given subwoofer diameter. There is
a slight sacrifice in maximum output but some very compact designs
can be realized that sound amazing on source material once called
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