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
Sleeve SleeveTip Tip
STANDARD 2-POLE 6.35mm JACK
Sleeve: Screen
Tip: Signal
Sleeve: Screen
Tip: Signal
RCA PHONO PLUG
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
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.
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 lowimpedance outputs. DAMAGE to the amplifier will
be caused if this is not observed.
LOW IMPEDANCE: Alow impedance 4Ω,8Ω,16Ωterminal is provided for connection of
loudspeakers. Ensure the total speaker load impedance is connected to the correct output
terminals, i.e. COM 4Ω,8Ωor 16Ω.
Fig. 3:Loudspeaker wiring
mix low impedance and 100V line loudspeakers on the same amplifier.
run microphone cables near mains, data, telephone or 100V line cables.
If you must cross these cables do it at 90°.
run 100V line cables near data, telephone or other low voltage cables.
exceed 90% of the amplifiers output power when using 100V line
(speech only).
exceed 70% of the amplifiers output power when using 100V line (high level
background music).
use re-entrant horn loudspeakers for background music unless the
loudspeaker has been specifically designed for this purpose.
low impedance loudspeakers if you are using more than two loudspeakers
and/or have long loudspeaker cable runs.
jointing the microphone cable, when this is unavoidable make sure a good
screened connector is used, e.g. XLR.
use a good quality microphone cable when extending.
use a mains grade double insulated cable for loudspeaker cable runs.
thatall loudspeakers are in-phase.
that there are no short circuits on the loudspeaker line before connecting to
the amplifier.
ENSURE
ENSURE
ALWAYS
ALWAYS
AVOID
AVOID
DO NOT
DO NOT
DO NOT
DO NOT
DO NOT
DO NOT
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
bythe letter ‘E’ orby the safety earth symbol orcoloured green and yellow.
The wire which his coloured blue must be connected to the terminal which is marked with the
letter ‘N’ orcoloured black.
The wire which is coloured brown must be connected to the terminal which is marked with the
letter ‘L’ orcoloured 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
inthe plug or at the distribution board.
P650A/P650B Installation and Operating Instructions
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT The wires in the mains lead are coloured in accordance with the following code:
Green and Yellow: Earth (E)
Blue: Neutral (N)
Brown: Live (L)
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