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IWTS-28 SUB In-Wall Subwoofer
Connecting the IWTS-28 SUB to Your System
The IWTS-28 SUB may be used as a passive bass module to reinforce the
bass from the left/right front speakers in your system, or it may be powered
by an external amplifier (such as Atlantic’s SA-180 mono bloc amplifier).
To Connect as a Powered Subwoofer:
Leaving the jumpers in place, connect the speaker wires from the SA-180 to
one black terminal and one red terminal on the 28 SUB. Make sure the 28
SUB’s front-panel low-pass switch is in the off position (see fig. 3).
Figure 3 – IWTS-28 SUB jumpers
To Connect as a Passive Bass Module:
Remove the jumpers from the 28 SUB’s terminals (see fig. 4). Run speaker
wires from the receiver’s front left speaker terminals to one set of termi-
nals on the 28 SUB. Run another set to the other set of terminals on the
28 SUB. (see fig. 5) It does not matter which woofer on the 28 SUB is con-
sidered ‘right’ or ‘left,’ since bass is generally recorded in mono, and is non-
directional anyway. Be careful to observe consistent polarity between the
two woofers, and between the woofers and front L/R speakers. All reds and
blacks should be consistent.
Be sure to switch the 28 SUB’s front panel low-pass switch to “on.” This will
filter out any signal above around 200 Hz from reaching the 28 SUB module,
and ensures that only the non-directional lower frequencies are being fed to
the SUB, thus preserving your system’s front-channel sonic imaging.
IMPORTANT NOTE:
Each individual woofer in the 28 SUB is 8 ohms;
when connecting them in parallel with your front L/R speakers (as you
do when using the 28 SUB passively), the front L/R speakers need to
also be 8 ohms minimum, so that their combined paralleled imped-
ance does not fall below 4 ohms. Consult your receiver’s owner’s
manual for more information on its impedance drive capability.
LEFT
–+ –+ –+
–+ –+
CENTER RIGHT
LEFT
SURROUND
RIGHT
SURROUND
Figure 4 – Removing the IWTS-28 SUB jumpers
Figure 5 – Connecting as a Passive Bass Module
Connections