Owner’s Manual for models HP112 • HP115 • HP215 • HP118S
6
1
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 [email protected] for service instructions.
2
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.
3
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.
•
HP 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.
4
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 HP Series loudspeaker.
• I
f the green SIGNAL LED remains illuminated without a source
connected, the amp may need servicing.
5
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 HP Series amplifiers employ a sophisticated
limiter circuitry, which monitors signal condition at both LF and HF
amplifiers (LF only on HP118S) 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 the 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.
6
lOW CUT SWITCH
HP112, HP115, HP215: 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. This will
enable your subwoofer-equipped system to operate properly and