4
Installation
This unit must only be installed by a competent person after taking a site survey to establish that the
structure is suitable and that there are no existing plumbing, gas, electrical services or other
obstructions already in place.
The P650C must be earthed. NEVER disconnect the earth, even in an attempt to prevent „hum‟. If
the earth were disconnected, it could result in equipment connected to the input (even indirectly
through a mixer), such as microphones, becoming live in the event of a fault (such as a liquid spillage
into the amplifier).
Install the P650C away from sources of moisture; avoid areas where drinks can be spilled onto the
amplifier as this may cause serious damage.
Avoid using microphone leads longer than 5 m. If longer microphone cable runs are required, then
an amplifier with balanced-line microphone inputs is required.
For connection of 100 V line loudspeakers, two-core 0.75mm2 cable should be used. Loudspeaker
cables may not be run in the same conduit as mains cabled.
100 Volt line loudspeakers.
The 100V line system was developed to allow a long distance between loudspeakers and the
amplifier, and to allow a large number of speakers to be connected to each amplifier.
In order to do this, the audio is transmitted at a much higher voltage (100Vrms) than with a
conventional low-impedance amplifier, such as a hi-fi or disco amplifier.
Each loudspeaker is coupled to the amplifier by an inbuilt transformer. The transformer is generally
fitted with a switch or a set of terminals that can be used to select the power supplied to the
speaker. Thus, every loudspeaker connected to the 100V line can be set to the most appropriate
power level.
Inputs
Microphones:
Connect microphones to the sockets on the rear panel, use a mono 6.3mm jack plug. If the
microphone has a screened two-core cable, connect one core to the screen. Use Low impedance (30
-600 ohm) Microphones.
Line inputs:
Connect any line inputs (such as radio, CD player, MP3 player) to the AUX or PHONO inputs on the
rear panel using RCA phono plugs. AUX or PHONO cannot be used at the same time this can be
selected using the switch on the rear panel. These inputs are generally used for background music.
