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For use with a low impedance amplifier:
Remove the rear cover of the P111CD and connect the output from the
amplifier to the red and black terminals (red terminal to the positive output).
Most low impedance amplifiers can drive a 4
Ω
load. Verify this by checking the
manual supplied with the amplifier.
If so then a maximum of TWO P111CD loudspeakers may be connected to
each channel of the amplifier provided that no other loudspeakers are also
connected to the same amplifier (most low impedance amplifiers are stereo
and have two outputs)
Some amplifiers, however, can only drive an 8
Ω
load. If this is the case, then
only ONE P111CD loudspeakers may be connected to each channel of the
amplifier.
If the amplifier is rated at more than 50 Watts, then great care should be
exercised not to exceed the maximum rated power of the P111CD.
OPERATION
The P111CD is a horn loudspeaker, designed for maximum efficiency in the
vocal range. It therefore has a limited frequency response of 90 Hz to 20 kHz,
which does not include low bass frequencies. The loudspeaker may be
damaged if driven with excessive amounts of bass frequencies. If a bass
control is available on the amplifier then it should be turned down to reduce
the amount of bass.
On specialised 100 Volt line amplifiers there may be a “low-cut” or “high-pass”
filter switch which eliminates low bass frequencies from the output. If this
switch is available, then it should be switched ON.
FAULT FINDING
Output is very quiet on a low impedance amplifier:
Connection has been made to the 100 V line terminals instead of the low
impedance terminals which are red and black.
Output is very loud and distorted on a 100 V line amplifier:
Connection has been made to the low impedance terminals.
Excessive distortion on music signals:
The signal contains too much bass. The P111CD is not designed to reproduce
bass frequencies.
Excessive distortion on voice announcements:
The microphone is being held too close, which increases the amount of bass in
the signal. Hold the microphone further away, or reduce the bass control on
the amplifier.
Feedback (howlround):
The loudspeaker has been mounted too close to the microphone. Either move
the loudspeaker further from the microphone, or rotate it to point away from
the microphone.
Содержание P111CD
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