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LED POWER INDICATOR
The green LED POWER indicator, located on the back of the amplifier,
will illuminate when the AC Power switch is in the “ON” position. The
LED POWER indicator will dim and turn off when the AC Power switch
is in the “OFF” position or AC mains power has been disconnected
from the loudspeaker.
If the POWER indicator does not illuminate when the loudspeaker is
powered on, verify the AC mains line cord is properly connected to
the loudspeaker and inserted into the AC outlet. Verify the AC outlet at
the venue of operation is functioning properly. In the event of the AC
mains outlet functioning properly, but the loudspeaker fails to operate,
the loudspeaker may require servicing. Please contact support@
B-52pro.com for service instructions.
PROTECT LED INDICATOR
If the power module overheats, the amplifier will go into “protection mode”
to limit further temperature rise. The amplifier will take about 30 seconds to
several minutes for the temperature to drop and resume operation. When
this occurs, the exposed heat sink will feel hot to the touch.
• Overheating is usually caused by excessive ambient temperature,
direct sunlight for a prolonged period of time during operation, or
playing the loudspeaker past its operational limits.
If thermal overheating occurs, reduce signal level to avoid constant
illumination of the LIMIT LED INDICATOR. In some circumstances, for
example when ambient temperature is too high, you may need to set a
fan behind the speaker to improve ventilation at heatsink.
LIMIT LED INDICATOR
The red LIMIT indicator alerts the user that the amplifier output signal is
clipping and therefore is being compressed by the built-in clip-limiter.
Momentary Bright Red Flashes
• Indicates that the amplifier is clipping briefly causing overdrive
distortion and the internal limiter is reducing gain.
• ACTPRO-HD amplifiers employ a sophisticated compressor-limiter
circuitry which is nearly inaudible at moderate overdrive conditions.
It is normal to see the occasional flashing of the red LIMIT LED.
Continuous Bright Red Light
• Indicates continuous and gross overloading of the amplifier. Such
overloads are audible and may lead to overheating of the amplifier
and shortening the life of the speaker components. If the amplifier is
grossly overloaded and the red LIMIT LED is on the most of the time,
the operator should reduce the signal level so that LIMIT LED only
flashes occasionally.
SIGNAL LED INDICATOR
The green SIGNAL indicator alerts the operator to the presence of an
input signal at the loudspeaker amplifier.
• If there is no indication, check the gain settings on the amplifier and
increase the gain if necessary. Check input connections and audio
source for signal. If no output persists, try a different signal cable
from your mixer to the ACTPRO-HD Series loudspeaker.
• If the green SIGNAL LED remains illuminated without a source
connected, the amp may need servicing.
LEVEL CONTROL
Turn the LEVEL control clockwise to increase gain and counter
clockwise to decrease gain. When operating with the GAIN
set at 1/3 volume or below, it may be possible to exceed the
headroom of input circuitry on your loudspeaker. If this is the
case, reduce the input signal strength and increase the gain of the
loudspeaker amplifier.
Always observe the red LIMIT LED on the amplifier panel. This LED
lights when a signal is clipping and the compressor-limiter is activated.
All ACTPRO-HD Series amplifiers employ a sophisticated limiter circuitry,
whichmonitors signal condition at both LF and HF amplifiers (LF only on
ACTPRO-212S HD,
ACTPRO-18S HD, ACTPRO-18F HD)
and compresses the output signal when necessary to protect woofer
and compression driver from damages. Limiter circuitry works very
unobtrusively; you may not even notice when it activates. It may prompt
you to push input signal more, but it is a good practice to have red LIMIT
LEDs blink occasionally and not constantly. A constant LIMIT LED light
indicates a gross overloading condition and should be avoided. Reduce t
he signal level if the LIMIT LED lights or blinks constantly.
NOTE that LEVEL Control has a range of 30dB. It does not attenuate
output signal to zero. LEVEL control on the loudspeakers is used to
set optimal maximum level for performance, not for constant control of
sound volume. Your mixer’s master volume control should be used for
this purpose.
NOTE that LEVEL control provides about 12dB attenuation in middle
position. You will find that in most cases the best sound (lowest
distortions and lowest noise) will be achieved when LEVEL control is set
somewhere between middle and full clockwise position.
LOW CUT SWITCH
ACTPRO-1515 HD: Found beneath the LEVEL control, this small slider
switch engages or disengages the 100Hz 18db/Octave Low Cut filter.
Switch the filter OFF when not using subwoofers or other low frequency
enclosures. Switch the filter ON when you are connecting subwoofers
or low frequency systems and run full-range audio signal to
ACTPRO-1515 HD. This will enable your subwoofer-equipped
system to operate properly and allow the ACTPRO-1515HD loudspeakers
to provide improved clarity in the mid and high-range frequencies.
DO NOT engage the LOW-CUT switch on ACTPRO-1515 HD
loudspeakers when connected to Hi-Pass outputs of
ACTPRO-212S HD,
ACTPRO-18S HD, ACTPRO-18F HD subwoofer.
The Input signal for your full-range loudspeaker has already been
processed by subwoofer circuitry.
FULL RANGE OUTPUT CONNECTIONS
ACTPRO-1515 HD has one XLR output connector marked OUTPUT.
The output connector is wired in parallel with the input, allowing
connection of multiple enclosures in a “daisy-chain” fashion. The
ACTPRO-18S HD, ACTPRO-18F HD has two sets of output connectors,
one set (left and right) for full-range outputs (wired in parallel with inputs)
and one set (left and right) for hi-pass outputs with BBE processing.
ACTPRO-1515 HD: Insert the XLR connector into the jack marked
OUTPUT Connect the other end of the cable to the input of the
next down-stream audio device, such as another ACTPRO-HD
loudspeaker.
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