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Subwoofer OUTPUT (Full-range): Use the outputs marked OUTPUT
(Full-range) (Left and/or Right) when you are connecting to other
speakers and/or to other powered loudspeakers that enable fullrange
audio or if they feature their own low frequency filtering.
HP (Hi-pass) OUTPUTS: Use the outputs marked High-pass outs
(Left and/or Right) when you are connecting other ACTPRO-HD Series
and/or other powered loudspeakers that DO NOT feature low
frequency filtering or when the low frequency roll off is desired.
NOTE: BBE processing is present at this output.
NOTE: Make sure to power OFF any ACTPRO-HD Series and/or other
powered loudspeakers connected to the Hi-pass OUTPUT before turning
off the subwoofer power. This will prevent any unwanted transients
(thuds, lowpops) from coming out of the connected loudspeakers.
NOTE: When you connect the ACTPRO-1515 HD Series Full-range active
loudspeaker to Hi-pass outputs of the
ACTPRO-212S HD /
ACTPRO-18S/F HD subwoofer, DO NOT engage the LOW-CUT switch on
Full-range loudspeaker. The input signal has already been processed by
ACTPRO-212S HD /
ACTPRO-18S/F HD circuitry. Also, if you’re using
full range loudspeakers from another manufacturer, we recommend that they
be connected to the Hi-pass OUTPUT. This will ensure proper phasing of the
full range loudspeaker with respect to the
ACTPRO-212S HD /
ACTPRO-18S/F HD subwoofer and enhance its sound with BBE processing.
INPUT CONNECTIONS
ACTPRO-1515 HD has one female XLR line-level input marked INPUT.
The ACTPRO subwoofers have a second connector (two input connectors
total), one for the left channel’s audio input and one for the right
channel’s audio input.
Balanced connections should be used as much as possible to reduce
AC hum and interference, especially with long runs of cable. On all
ACTPRO-HD amplifier modules, the input impedance is 20k Ohm for
balanced connections.
ACTPRO-1515 HD: Insert the male XLR connector into the jack marked
INPUT. Ensure the connector is fully seated.
ACTPRO-Subwoofer: FOR STEREO OPERATION WITH FULL-RANGE
CABINETS: From your mixer, insert the left channel’s XLR connector
into the left channel’s (L) INPUT connector. Connect the right channel
of your mixer by inserting the XLR connector into the right channel’s (R)
INPUT connector on the amplifier. When a single input signal is used,
(for mono operation) make certain the input and output connections
correspond to the same channel (L or R). When two input signals
are supplied to the amplifier, the subwoofer’s gain is automatically
increased by 6dB.
POLARITY SWITCH (ACTPRO-Subwoofers)
The ACTPRO-subwoofers have a POLARITY switch. When the POLARITY
switch is set to NORM, the polarity is such that a positive input will cause
the cone to push outward. When set to REV, the input signal’s polarity
is reversed and a positive input will cause the loudspeaker’s cone to
pull inward.
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When all of the loudspeakers in a system are operating with the same
polarity, a positive polarity signal causes the excursion (the forward
motion) of all loudspeaker cones. In turn, this sets up a positive
reinforcement of the sound wave (each loudspeaker reinforces the
output of the other loudspeakers). This effect refers to the speakers
being “in phase” The effect of proper “phasing” is most noticeable in
low (bass) frequencies. If a loudspeaker’s phase is incorrect, its cone
moves inward while the properly phased loudspeaker’s cones move
outward. The inward movement, of the improperly phased loudspeaker,
will effectively cancel the bass response of a similarly-sized driver in
the system. This results in a reduction of the bass output.
It is important to maintain correct phasing in a loudspeaker system, in
order to operate at maximum performance. Incorrect polarity can be
caused by incorrectly wired cables, interconnecting cables, and mixer
functions set incorrectly.
Phasing is also influenced by the mutual positioning and orientation of
the loudspeakers in a system. It is possible to have proper polarization
(of all cables and equipment) and still achieve better bass response
by having the subwoofer set to reverse polarity, or having several
subwoofers set at different polarities. Bass response also will change
with the listener’s position in the room. During testing, monitor the bass
response from several different locations in the venue.
How to Use the POLARITY Switch: Start with all subwoofers in the
system with POLARITY switches in the NORM position. This is the same
for systems with one subwoofer as well. Next, with your system playing
at or near its expected operating level, change the polarity of each
subwoofer, one at a time. Walk around the venue and evaluate the
overall bass response, and select the phase setting that produces the
best overall bass response.
GROUND LIFT SWITCH
All ACTPRO-HD Series amplifier modules are equipped with a GROUND
LIFT switch. Powered loudspeakers are often fed by long run signal
cables, connected to power outlets different than the audio source’s.
This may create an audible hum or buzz due to ground loops or other
connection problems. The GROUND LIFT switch will help you to avoid
these issues.
It is a good idea to keep the GROUND LIFT switch in EARTH position
unless you have hum or buzz coming from your speakers. If you do
hear hum or buzz, toggle switch into LIFT position.
WARNING: NEVER BREAK EARTH CONNECTION IN YOUR AC
PLUG. IT MAY CAUSE PERMANENT DAMAGE TO THE AMPLIFIER
AND MAY CAUSE DANGER OF ELECTRICAL SHOCK TO YOU AND
OTHERS.
POWER SWITCH
Push in the top of the power switch to apply AC power to the powered
loudspeaker’s amplifier. Push in the bottom of the power switch to
turn the loudspeaker amplifier off. When turned on, the blue POWER
indicator LED on the front grille will illuminate, along with the POWER
and PROTECT LED on the amplifier. After a few seconds, the yellow
PROTECT LED indicator will dim and turn off.
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