As the colours of the wires in the mains lead of this apparatus may not correspond with the
coloured markings identifying the terminals in your plug proceed as follows:
The wire which is coloured green and yellow must be connected to the terminal which is marked
by the letter 'E' or by the safety earth symbol or coloured green and yellow.
The wire which his coloured blue must be connected to the terminal which is marked with the
letter 'N' or coloured black.
The wire which is coloured brown must be connected to the terminal which is marked with the
letter 'L' or coloured red.
If a 13 Amp (B.S. 1363) plug or any other type of plug is used, a 5 Amp fuse must be fitted either
in the plug or at the distribution board.
DO NOT
mix low impedance and 100V line loudspeakers on the same amplifier.
run microphone cables near mains, data, telephone or 100V line cables.
DO NOT
If you must cross these cables do it at 90°.
DO NOT
run 100V line cables near data, telephone or other low voltage cables.
exceed 90% of the amplifiers output power when using 100V line
DO NOT
(speech only).
exceed 70% of the amplifiers output power when using 100V line (high level
DO NOT
background music).
use re-entrant horn loudspeakers for background music unless the
DO NOT
loudspeaker has been specifically designed for this purpose.
MICROPHONE 1 & 2 (P650A): These are unbalanced inputs using 2 pole standard 6.35mm
jack sockets located on the front panel. The levels are set by the respective controls adjacent
to the socket.
AUX/PHONO INPUT: Unbalanced inputs using standard RCA phono sockets are located on
the rear panel. The volume level is adjusted by the control located on the front panel.
These inputs can be used for PHONO and AUX sources (Tuner, Tape, CD) and should be
selected using the AUX/PHONO selector switch located on the rear panel.
Fig. 1: Wiring of signal plugs
STANDARD 2-POLE 6.35mm JACK
Sleeve
Sleeve: Screen
Tip: Signal
MICROPHONE 1 (P650B): MIC 1 is an unbalanced input using a 2 pole standard 6.35mm
jack socket located on the rear panel. The volume level of the input is adjusted by the control
located on the front panel. MIC 1 has PRIORITY over all other inputs when the terminals
are short circuited.
Fig. 2: Priority control
PRIORITY COM
MICROPHONE 2 (P650B): MIC 2 is an unbalanced input using a 2 pole standard 6.35mm
jack socket located on the rear panel and the volume level is adjusted by the control located
on the front panel.
P650A/P650B Installation and Operating Instructions
RCA PHONO PLUG
Tip
Sleeve
Tip
Sleeve: Screen
Tip: Signal
4Ω
8Ω
16Ω 100V
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT The wires in the mains lead are coloured in accordance with the following code:
Green and Yellow:
Blue:
Brown:
low impedance loudspeakers if you are using more than two loudspeakers
AVOID
and/or have long loudspeaker cable runs.
jointing the microphone cable, when this is unavoidable make sure a good
AVOID
screened connector is used, e.g. XLR.
ALWAYS
use a good quality microphone cable when extending.
ALWAYS
use a mains grade double insulated cable for loudspeaker cable runs.
ENSURE
that all loudspeakers are in-phase.
that there are no short circuits on the loudspeaker line before connecting to
ENSURE
the amplifier.
LOUDSPEAKER OUTPUT: Important: Outputs for two different types of loudspeakers are
provided, however you may only use one type at any one time, e.g. if you are using 100V
line loudspeakers you must NOT use low impedance outputs. DAMAGE to the amplifier will
be caused if this is not observed.
LOW IMPEDANCE: A low impedance 4Ω, 8Ω, 16Ω terminal is provided for connection of
loudspeakers. Ensure the total speaker load impedance is connected to the correct output
terminals, i.e. COM 4Ω, 8Ω or 16Ω.
Fig. 3: Loudspeaker wiring
COM 4Ω
COM 4Ω
COM 4Ω
1
Earth
(E)
Neutral
(N)
Live
(L)
8Ω
16Ω 100V
8Ω
8Ω
Total impedance 4Ω
8Ω
16Ω 100V
16Ω
16Ω
Total impedance 8Ω
8Ω
16Ω 100V
8Ω
8Ω
Total impedance 16Ω