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Page 6 Model PA435X
© 2003 Xantech Corporation
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FIGURE 3 – PA435X REAR PANEL - FEATURES AND FUNCTIONS
6. Line Inputs. These RCA-type jacks are the audio inputs for each of the amplifier pairs. Connect them to
the Preamp Output jacks of Zone 7 & 8 of the MRC88 (or other driving preamp output) with good quality
RCA-type patch cables. Note that the inputs are marked LEFT-A-RIGHT, LEFT-B-RIGHT signifying the
stereo channel pairs. Both the LEFT and RIGHT jacks are always active even when the MODE switch
(item #8) is set to the MONO or BRIDGED mode.
7. Input LEVEL Control. This screwdriver adjustable control (for each stereo or bridged pair) allows the
input level for full rated power output to be adjusted over a range of 0.2 volts to 3 volts (24.3 dB).
Normally you would adjust the driving preamp to maximum volume, then set this control to the maximum
volume that the client desires for a given zone or room. This prevents the system from being driven to
unwanted power levels.
NOTE: To set the Input Level Control for matched output to the MRC88 Speaker output, set the Input
Level Control on both pairs to the .7v (1:30) position as shown in Figure 4 below.
Matched MRC88 Setting
(0.7v = 1:30 position)
Figure 4: PA435X Level Adjustment setting when used with MRC88
8. MODE Switch. Switches the amplifier pair between STEREO, MONO and BRIDGED modes.
a. In STEREO mode, the two amplifiers operate independently of each other for 35 Watts of output
each.
b. In MONO mode, left and right input signals are summed internally for Mono output from each of the
two amplifiers. When interfacing a mono audio source, either the Left or Right (item #6) inputs may
be used.
c. In BRIDGED mode, the two amplifiers are bridged for a single channel of high power output (70
Watts @ 8 Ohms). Either the Left or Right input (item #6) may be used to drive the resultant single
channel amplifier.