Connections; Control Unit To Power Amplifier; Power Amplifier To Loudspeakers - QUAD 33 Instruction Booklet

CO N N EC T I ONS
D i n s t y l s p l u g s s h o w i n g m e t h o d o f a s s e m b l y . S e e i n d i v i d u a l i l l u s t r a t i o n s
f o r D i n c o n n e c t i o n s .
Control Unit to Power Amplifier
Two leads are supplied with the control unit. That
with a 4-pin connector at each end is reversible and
connects the control unit output to the power amplifier
input. The other connects the switched mains supply
from the control unit to the power amplifier and the
2-pin plug at the control unit end of this lead is
reversible. (See Fig. l0). Longer leads are permissible
where required for special installations (see Specification
on page 2l).
Pape Six
Power Amplifier to Loudspeakers
Ordinary lighting flex or similar cable may be used
for connecting the loudspeakers to the power amplifier
unless a very long run is involved in which case a heavier
calibre cable should be used. As a rough guide the DC
resistance of the cable should not exceed about 5,% of
the nominal impedance of the loudspeaker. Each loud-
speaker should be connected to its appropriate llower
amplifier output so that the two pairs of wires are con-
nected in the same way, to ensure that the speakers
operate in phase. For example, if the top output socket
on one channel is connected to the left-hand terminal
of its speaker, the top output socket on the other
channel should also be connected to the left-hand
terminal of its speaker. This is quite straighfforward
but should there be any doubt the phasing can be
checked later experimentally. (See Page l5). Where
one loudspeaker only is used for mono, phase is not
important and in this case either outlet may be used
and the sockets of the other channel left vacant.
In cases where loudspeakers, such as the electrostatic
loudspeaker, also require an eneryising supply, the
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