2

Single Reflex Bandpass (vented)

A single reflex bandpass enclosure combines the fea-
tures of acoustic suspension and ported reflex designs. In
this type of enclosure, one side of the subwoofer is
mounted in an acoustic suspension enclosure, while the
other side is mounted in a ported reflex enclosure.
A single reflex bandpass enclosure controls the move-
ment of the speaker’s cone at low frequencies (like an
acoustic suspension enclosure), and has the ability to
sacrifice efficiency for deeper bass or vice versa. The fre-
quency response of the single reflex bandpass enclosure
is controlled by the volume of the enclosure.
Due to the complexity of its construction, a single reflex
bandpass enclosure can be difficult to design and build. If
you are inexperienced at building enclosures, we recom-
mend that you build an acoustic suspension or ported re-
flex enclosure.
CONNECTING THE SUBWOOFER TO YOUR STEREO AMPLIFIER
We recommend you use 12-gauge or thicker wire (such
as Cat. No. 278-1268, not supplied) to connect the sub-
woofer to your stereo amplifier. For the maximum bass
response and the best overall performance, be sure to
connect + to + and – to –.
Note: You can mount an optional speaker plate on your
enclosure (such as Cat. No. 274-630) to make it easy to
connect the subwoofer to your stereo amplifier. This lets
you connect the subwoofer to the plate, then connect the
plate to your stereo amplifier.
Follow these steps to connect the subwoofer directly to
your sound system.
1. Run one wire from each of the subwoofer’s terminals
to the stereo amplifier.
2. Separate each wire’s two conductors at both ends for
a length of about 2 inches, then strip the insulation
from the ends of each conductor to expose 1/2 inch of
wire.
3. Twist the endcap from a banana plug (not supplied)
to remove it, route one of the speaker’s wires through
the endcap, then fold the exposed wire around the
top of the endcap.
4. Screw the banan a plug back onto the endcap as
shown here.
5. Repeat Steps 3 and 4 for each of the subwoofer’s
wires.
6. Press the banana plugs into the subwoofer’s termi-
nals to connect them.
11 × 11 × 201/4 Inches (HWD)
1.02 Cubic Feet (.50 Se aled/.52 Vented)
A (2) — 11 × 11 Inches
B (1) — 91/2" × 91/2" (with 71/16" diameter cutou t)
C (2) — 11" × 201/4" HW (with cutout for 3 in. vent )
F3: 46–111 Hz
Ripple: 0 dB
Excursion Limited Power Handling: 54 Watts
Tuning Frequency: 73 Hz
D (2) — 91/2" × 201/4" HW
C
C
A
A
B
D
D
Inside Distance from Baffle to End Pane l of
Sealed Side of Enclosu re — 91/2"
2 inches
1/2 inch
2 inches
1/2 inch
Speaker
Wire
Endcap