Sealed Enclosures; Vented Enclosures; Damping; Recommended Enclosures - DLS PERFORMANCE PS10 User Manual

Sealed enclosures

Sealed enclosures constructions is straight
forward and are easy to build. The size is
not critical, but it can't be too small. The
speaker data such as Fs, Qts, Vas and
X-max decides the size of the enclosure. A
large subwoofer needs larger boxes. Two
woofers need a box of the double size etc.
The enclosure must be completely airtight.
A sealed enclosure provides the most
control over the woofer's movement, a
woofer mounted in a sealed enclosure will
handle more power than a woofer mounted
in a vented enclosure type.
Sealed enclosures provide more accurate
sonic reproduction than other enclosure
types when mounted inside a vehicle, so
they are well suited to all types of music.
An optimum sealed enclosure is always
smaller than vented enclosures optimized
for a particular subwoofer, so they require
the smallest amount of space inside the
vehicle.

Vented enclosures

Vented enclosures are built in the same
way as sealed but with a vent hole (port),
normally on the front panel.
Vented enclosures provide normally a
better efficiency in the 40-50 Hz range, but
this efficiency comes at the expense of
sound in the lowest octave (normally below
Type Volume
Sealed 13-19L
0.46 - 0.67 cu ft
Vented 39L
1.37 cu ft
Qtc
0.89 - 0.707 56Hz - 53Hz
- 34Hz
6
40Hz), and at the expense of some control
and power handling at the lowest frequen-
cies ( below the ports tuning frequency). If
you are using a small amplifier a vented
box will provide more perceived bass
output from less power. Vented enclosures
are also well suited to a variety of music
types.
Vented enclosures require more of the
builder and the volume and port must be
built more exactly to the specifications. An
optimum vented enclosure is always larger
than the optimum sealed box for the same
woofer and will require more space inside
the vehicle.

Damping

Most enclosures should be damped inside
with synthetic (acoustic) wool or damping
mat (line). In a sealed box we recommend
the use of damping wool and should be
filled with acoustic wool up to 75%.
In a vented enclosure attach the damping
material on the wall opposite from the
subwoofer and port. If you require more
damping is also possible to add sides and
top/bottom. Do not place any damping
material in the port or at it´s openings.

Recommended enclosures

The recommended
refers to the inner volume and includes the
driver displacement volume.
F3 Fb
-
42Hz
enclosure volume
Port
D: 4" / 104mm
L: 15.7" / 400mm