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Model PA635X
© 2001 Xantech Corporation
GENERAL INFORMATION
To enhance the ease of installation and obtain optimum performance from the PA635X, we recommend that you first
become familiar with all its features and special capabilities by studying the descriptions and instructions in this
manual.
The PA635X was designed to meet the audio power amplifier needs of custom installed multi-zoned systems with
high sonic quality. It's 6-5-4-3 multi-channel capability permits a wide variety of other uses as well, such as surround
sound home theater applications. Specific features and technology are as follows:
Cost/Size Efficiency
. The PA635X features six 35-watt power amplifiers. This permits each PA635X to drive 3-
zones in a multi-zone system -- each with a 35-watt stereo amplifier per zone. The rack-mount design, plus multiple
amplifiers in a single package, delivers high quality at a reasonable price.
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.).
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PA635X
SIX CHANNEL AMPLIFIER
POWER
FIGURE 1 – THE MODEL 635X
6-5-4-3 Output Flexibility.
Each pair of amplifiers can be bridged to allow several channel and power output
capabilities. It can be configured into four power packages as follows Which gives the PA635X added use in many
other applications, such as driving surround sound speaker systems:
•
Six 35-watt amplifiers.
•
One 70 and four 35-watt amplifiers.
•
Two 70 and two 35-watt amplifiers.
•
Three 70-watt amplifiers.
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.
Auto Protection Circuit
. Protects the PA635X if a short or very low impedance is detected at the speaker terminals.
Each amplifier pair is protected separately, with an LED indicator showing which pair is in protection. Normal
operation is restored automatically within 3 to 4 seconds after the short is removed.
Remote Master ON/OFF Control Jack
. This jack allows the PA635X to be powered on and off by a positive DC
voltage ranging between 4 and 30 volts (11mA @ 12 V). Specifically, it permits the 12 volt common CO (Control
Output) or zone STATUS outputs from the Xantech ZPR68 to power one or more PA635X's ON and OFF
automatically with zone ON/OFF commands.