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Amplifiers & Preamplifiers
In addition, this switch must be left in the MANUAL OFF (OUT) position to permit an external DC
Control Voltage to power the PA1235 ON and OFF.
Refer to "REMOTE MASTER ON/OFF CONTROL" terminals, item #13.
NOTE: The PA1235 may also be powered ON/OFF with an external AC line switch into which the
power cord of the PA1235 is plugged (such as the switched AC outlet of a preamp, timer, etc.).
For this type of operation, leave the POWER switch depressed to the MANUAL ON position.
4. Status LED Indicators. These indicators, one for each channel pair, provide the following status
information:
a) They show Power ON/OFF and Standby ON/OFF conditions.
b) They flash Amber 5 times during power up, then turn steady Green when Power On Mute releases.
On power down, they flash Amber once, then go off.
This action occurs whether the unit is powered ON and OFF by the POWER switch (item # 3) or
by a DC voltage applied to the REMOTE MASTER ON/OFF CONTROL terminals (item #13). Be
sure the rear panel master AC LINE ON/OFF Switch, item #17, is set to the ON (I) position for the
above to occur.
c) They will go Off when the Standby OFF IR command is received. Sending a MUTE OFF command
will restore operation. Also, LEDs blink with Volume action.
d) A Mute command will cause them to blink Green (Red if Volume is within 5 dB of Max-V). Mute
is released when any other PA1235 command is sent.
e) Changing an IR Code Group will cause them to blink Amber, confirming the change has taken
effect.
f) When the volume level is increased to a range within 5 dB of MAX-V, the LED color changes from
Green to Red. NOTE: Red indicates that volume is approaching maximum --- not an indication
of power output level.
5. Line Inputs. These RCA-type jacks are the audio inputs for each of the amplifier pairs. Connect them
to the OUTPUT jacks of the driving preamp with good quality RCA-type patch cables. Note that the
inputs are marked LEFT-1-RIGHT, LEFT-2-RIGHT, etc., signifying the stereo channel pairs. Both the
LEFT and RIGHT jacks are also active when the MODE switch (item #7) is set to the MONO or
BRIDGED mode.
6. COMMON BUS / LOCAL Switch. Switches the amplifier stereo pair inputs between the LOCAL
(LEFT/RIGHT) jacks, item #5 and the COMMON AUDIO BUS (LEFT/RIGHT) jacks, item #8. In this
way, each amplifier pair can be driven by separate zones or sources or from a common source via the
COMMON AUDIO BUS.
7. MODE Switch. Switches the amplifier pair between STEREO, MONO and BRIDGED modes.
In STEREO mode, the two amplifiers operate independently of each other for 35 Watts of output each,
except IR control of Volume, Max-V, Mute, Standby OFF/ON and Balance functions is common to
both.
In MONO mode, left and right input signals are summed internally for Mono output from each of the
two amplifiers. Also, either the Left or Right (item #5) input may be used if the source is already a Mono
signal.
In BRIDGED mode, the two amplifiers are bridged for a single channel of high power output (150 Watts
@ 8 Ohms). Either the Left or Right input (item #5) may be used to drive the resultant single channel
amplifier.
CAUTION: Be sure to have the POWER turned OFF when changing the position of this switch
and
when making the corresponding speaker connection changes (see also item #12, following).
PA1235