It is usually a good idea to leave some slack at the input to the Impulse 500P Subwoofer and
to also tape the cables down or run them under a cable guard to avoid anyone tripping over
them or pulling the Impulse 500P over when stand mounted.
VOLUME CONTROL ADJUSTMENT
The Impulse 500P Subwoofer is equipped with a volume control to facilitate use in many
different applications. With the volume control adjusted fully CW, gain is at maximum and the
input sensitivity is 0.7 V RMS for full rated output. When driving the Impulse 500P Subwoofer
from a mixer, it may be advantageous to reduce the input sensitivity by turning the volume
control to the half-way point. The Impulse 500P Subwoofer will now more closely match a
typical power amp input that the mixer operator is used to.
If the mixer board indicates clipping of its output signals, then all of the Impulse 500P
Subwoofer power capability is not being utilized cleanly. Clipping the signal before it gets to
the Impulse 500P Subwoofer is not optimal. In that case, reduce the mixer output level, and
turn up the volume control on the Impulse 500P Subwoofer.
The amplifier in the Impulse 500P Subwoofer is equipped with DDT™, however there is no
indicator to show DDT™has engaged. If the bass sound seems heavily compressed, then the
Impulse 500P Subwoofer is heavily into DDT™compression, and the drive level from the
mixer (or the volume control on the Impulse 500P Subwoofer) needs to be reduced.
When first turning on the sound system, turn on all upstream electronics first, then the
Impulse 500P Subwoofer with its volume control fully CCW (all the way down). If sending a
signal to a full range powered system, such as the Impulse 500P, turn it on last, with its
volume control fully CCW. Begin checking levels with the mixer output level controls all the
way down, and bring them up slowly with the Impulse 500P Subwoofer volume control set to
the desired setting (1/2 way up recommended to start).
HIGH PASS FILTERED OUTPUTS
These are low impedance filtered outputs that are provided to send the high frequencies to a
powered speaker enclosure such as the Impulse®500P full range system, or to a
conventional power amp and speaker system. The output level is not affected by the volume
control on the Impulse 500P Subwoofer.
The nominal polarity of these outputs is positive, and can be run directly into the Impulse
500P®for a nearly perfect mesh of the subwoofer with the full range unit. The polarity should
also mesh with just about any other powered speaker or amplifier and speaker pair, as long
as they observe industry standard polarities. In the event they do not, the balanced output
can have pins two and three reversed with the use of an XLR or 1/4" phone cable that swaps
these two pins at one end. This will reverse the polarity of the highs coming out of the high
pass filtered output, and allow it to be used with equipment that might have polarity reversals.
USE OF MULTIPLE IMPULSE 500P SUBWOOFER’S
(or other Impulse®series powered products)
The provision of multiple parallel high-impedance inputs allows the inputs of the Impulse
500P Subwoofer to be “daisy-chained” from one to the other. Run the first cable from the
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