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Model PA435X Page 3
© 2003 Xantech Corporation
GENERAL INFORMATION
To enhance the ease of installation and obtain optimum performance from the PA435X, we recommend that you first
become familiar with all its features and special capabilities by studying the descriptions and instructions in this
manual.
The PA435X was designed to meet the audio power amplifier needs of custom installed multi-zoned systems with
high sonic quality. It is a 4 Channel amplifier that is primarily intended to interface with the MRC88 Whole-house
Audio Video Entertainment System for Zones 7 and 8 Preamp outputs or for Sub-Zone amplification of zones 1-6. It
may also be used as a standalone single or 2-zone amplifier. Specific features and technology are as follows:
Figure 1: The Model PA435X Amplifier
Cost/Size Efficiency. The PA435X features four 35-watt power amplifiers. This permits each PA435X to drive 2-
zones in a multi-zone system -- each with a 35-watt stereo amplifier per zone.
4-3-2 Output Flexibility. Either pair of amplifiers can be bridged to allow several channel and power output
capabilities. It can be configured into three power packages as follows:
• Four 35-watt amplifiers. (4 Mono speaker outputs or 2 Stereo Zone outputs)
• One 70 and two 35-watt amplifiers. (1 Mono 70 Watt and 1 Stereo 35-watt output)
• Two 70-watt amplifiers (single Zone Stereo 70-watt output)
Remote ON/OFF Control Jacks (C1 & C2). These 3.5mm Stereo Mini Jacks allow the PA435X to be powered on
and off and muted by a positive DC voltage ranging between 4 and 30 volts (11mA @ 12 V). Specifically, when
interfaced with the Control Out jacks of zones 7 & 8 on the MRC88 (labeled CO1 and CO2), it permits the MRC88 to
power the PA435X ON and OFF automatically with zone ON/OFF commands.
Input Level Flexibility. The input levels are individually adjustable (per stereo pair) from a low of 0.2 volts up to 3
volts. This gives the installer the ability to adjust the overall gain of the system or zone. For instance, there may be a
need to adjust the amplifier to deliver a controlled, maximum sound level into a zone when the volume control on the
preamp is set to maximum. This would act as a volume limiter for any particular zone (i.e. to prevent the kids from
over-driving wall speakers, etc.). When set to the 1:30 position, this will match the sensitivity level of the standard
Amplifier output setting of the MRC88.
Low Impedance Capability. Each amplifier is 4-Ohm safe under music conditions in stereo mode and 8-Ohm safe
when bridged. This means, for instance, that you can drive two pairs of 8-Ohm speakers in stereo mode in each zone
with ease.