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Amplifiers & Preamplifiers
7. MUTE ON/OFF. Separate ON / OFF Mute commands give positive mute action without knowing the
actual mute status. This is very helpful in a remote room where commands are sent “blind” without
any visual aids for status.
NOTE: In addition to MUTE OFF, the muted condition can be released with VOLume (item #8), Preset
Level (item #2) and Balance (items #4 & 5) commands.
8. VOLume Up/Down Commands. When pressed in individual steps, volume increase and decrease is
2 dB per step over a range of 0 dB (Max.) to -60 dB. The next step below -60 dB is OFF (> -90 dB).
When pressed continuously, volume level will change (ramp) continuously in 1 dB steps. See also
MAX-V settings (item 6).
NOTE: Volume action of the PA1235 has been designed specifically to ramp more quickly in the
DOWN direction and more slowly in the UP direction.
9. Code Group Numbers. The PA1235 is capable of being set to 55 different code groups, both
individually as amplifier pairs and collectively as a group.
NOTE: As shipped from the factory, all amplifier pairs in the PA1235 are set to code group number
A0.
Be sure to set the RC68+ to the same number!
It may be necessary to change the PA1235 amplifier pairs to different code groups if you wish to
address each pair individually from the COMMON IR BUS (item #15, Fig. 3) or an external common
IR bus network when using other Xantech PA1235's in large systems, to avoid mutual interaction.
Refer to the RC68+ instructions for code group setting procedures.
10. ADJ-OFF Command. This command unlocks a previous MAX-V setting. See also item #6.
INSTALLATION
PHYSICAL LOCATION AND MOUNTING
When you mount the PA1235, you should plan its location carefully. Pay close attention to each of the
following factors:
1. The amplifier is convection cooled. That is, it depends on the natural free flow of air up through the
slot perforations in the bottom plate, over the internal heat dissipating fins, then out the top cover, for
adequate cooling.
Upper shelf, component, wall, etc.
2-inch spacing
(minimum)
PA1235
To maximize air flow, route
single large opening in lower shelf.
Keep perforations on top cover free of
obstructions for max. cooling effect.
Keep perforations on bottom
plate free of obstructions.
Convection
Airflow
Fig. 5 Horizontal Mounting
PA1235