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INTRODUCTION
The PULSE model PS218P is a powered subwoofer with two 300-watt amplifiers, one for each of its dual 18-
inch high-performance woofers. Quick and easy setups are facilitated with features such as a LINE/SPEAKER
push-button which enables you to drive the PS218P's inputs with either line level signal or speaker level
signal, and the inputs will accept either a mono or stereo source. Additionally, the inputs are balanced so that
noise cancellation will be optimized when a balanced line-level source is connected; however an unbalanced
line-level source may also be connected without need for special adjustments or cable adapters.
FEATURES
1. Power Switch, Fuse & LED
The Power Switch and Fuse are located on the
left side of the back panel. Always replace the
fuse with the same type: 8 amp slo-blo (T4A for
230V models).
2. SUBWOOFER LEVEL control
The SUBWOOFER LEVEL control regulates the
PS218P's volume. Set this control for the desired
balance of low frequencies with the rest of your
system. At high operating levels, the subwoofer
power amplifier will be regulated by its limiter.
As a result you may find that increasing the
SUBWOOFER LEVEL control above that
operating level will not have any effect. This is
normal and simply means that maximum
undistorted subwoofer volume has been
achieved. The SUBWOOFER LEVEL control does
not regulate other speakers connected to the
PS218P's PARALLEL THRU jacks.
3. UNGROUNDED/GROUNDED switch
Whenever mixers, AC-powered signal sources
and amplifiers are interconnected there is always
the possibility of a ground loop being created
because something is not grounded the same way
as the rest or because the other connected units
are all ungrounded. Ground loops result in a
continuous 60Hz hum which can be heard
through the speakers. Normally, the PS218P's
ground reference would be lifted with the push-
button in the UNGROUNDED position. If a hum
occurs, try setting the button up in the
GROUNDED position. In the UNGROUNDED
mode, the sleeves of the 1/4-inch inputs are lifted
from ground reference. In the GROUNDED mode,
the grounding is done through a 10-ohm
protection device which prevents damage in case
of accidental cable miswiring.
TIP: The use of balanced cables, even if the line-
level mixer outputs are unbalanced, will help to
reduce the occurrence of hum and noise.
4. INPUT LEVEL push-button
This feature enables you to drive the PS218P's
inputs with either line level or speaker level
signals. For example, if you have connected one of
the INPUT jacks to a mixer's line-level output, you
would push the button up into the LINE position.
If, on the other hand, you have connected the
INPUT/s to one or two speaker outputs on a
mixer/amplifier or power amplifier, or to a parallel
connection on another speaker, you would push
the button down into the SPEAKER position. It is
important for this feature to be set correctly to
ensure proper performance of the product.
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