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MONO
MODE
CONNECTIONS
The following connection diagram applies to the P2075 when
operated in bridged MONO configuration.
SPEAKER(S)
TOTAL LOAD NOT LESS THAN 8 OHMS
(DO NOT USE PHONE JACKS)
SPEAKERS
Тапа2 =8-162/ SPEAKER
10г2 =4-160/ SPEAKER
2
A
©)
"27
CHANNEL
(—)—
—— (MONOJ8-320
Fig. 6 BRIDGED MONO OUTPUT CONNECTIONS
The rear panel MODE
switch, when set to MONO, prepares
the
amplifier
for
bridged
operation.
In
this
context,
"bridged" describes the special wiring of the two channels of
the amplifier so that the outputs add together and produce
twice the voltage of one channel alone. Since power is pro-
portional to the square. of the voltage, bridging can develop
up to four times the output power
given the same
load
impedance
... assuming
that
the
amplifier
can
handle
it.
Typically, however, the maximum
available output power in
bridged
mode
is somewhat
less than
the
theoretical
4X
increase
due to power supply restrictions. Since amplifiers
generally cannot handle four times their maximum unbridged
(normal
STEREO
mode)
power
output
when
in bridged
(MONO) mode, a more useable rule of thumb is that an amp
will deliver twice
its "normal"
rated power
into twice its
"normal" rated minimum impedance when bridged.
By using both channels of a dual-channel to drive a single
speaker
load
in the bridged
(MONO)
configuration,
it is
possible to achieve the wide headroom
and dynamic range
needed
for accurate
reproduction
of peaks and transient
sounds. When a stereo program must be reproduced, then a
pair of bridged
power
amps
can be used, each in bridged
MONO mode.
One
input
(Channel
A) is all that's. required
to drive the
amplifier when it is operated in MONO mode. The rear panel
MONO/STEREO
switch
"rewires"
the
input circuits
so
Channel A feeds both channels of the amplifier simultaneous-
ly, and the Channel
B output is electronically reversed in
polarity with respect to the Channel A output. The Charinel
B SPEAKER
output
red
(+) terminal
then
serves
as the
"low"
(—) side of the bridged output, and the channel A
SPEAKER
output red (+) terminal is the "high" side of the
bridged
output.
Neither
Маск
(—)
SPEAKER
output
terminal is used in bridged mode, nor are the 1/4-inch phone
jack outputs.
For MONO
operation,
connect
the signal
source
to the
Channel A input; the channel B input should remain unused.
Connect the speaker load as illustrated. When the amplifier is
set to MONO
mode, only the Channel A input connectors
and controls are operative, and it's a good idea to turn down
the Channel B Input Attenuator to. avoid confusion.
CAUTION
NEVER
CONNECT
THE
BLACK
(—)
SPEAKER
OUTPUT
TERMINALS
TO ANYTHING
WHEN
THE
AMPLIFIER
IS IN BRIDGED
MONO
MODE.
In this
mode, both of the red (+) SPEAKER output connectors
are "hot". Do not allow them to short together, or to
any other connections in your sound system.
WARNING
When operating in the bridged mode, the extra voltage
warrants
extra care to avoid touching speaker wiring
since the amplifier can easily deliver a lethal combina-
tion of voltage and current.
Make sure that no return path between speaker wiring
and
equipment
chassis
or rack
cabinets,
which
are
probably
grounded,
exists any
time, especially when
you're using the amplifier in the bridged mode of opera-
tion. In bridged mode, the red (+) output terminals of
the amplifier are both "hot", and are not referenced to
ground but only
to each
other.
Thus a return path
connected to ground would short one or both sides of
the amplifier, could cause the amplifier to shut down,
and might even damage it.
In mono mode, never use the 1/4-inch phone jacks on
the amplifier, and avoid the use of 1/4-inch phone plugs
at the speaker end of the cable. Phone plugs are a poor
choice in general for speaker connectors, especially in a
bridged system, because these plugs cause
a momentary
short circuit as they are plugged in or pulled out.
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