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INSTALLATION INSTRUCTIONS
MODEL PA435X
FOUR CHANNEL POWER AMPLIFIER
TABLE OF CONTENTS
SectionTitle Page
SAFETY INSTRUCTIONS - READ BEFORE OPERATING EQUIPMENT................................................................................................................2
GENERAL INFORMATION .........................................................................................................................................................................................
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Page 2 Model PA435X SAFETY INSTRUCTIONS - READ BEFORE OPERATING EQUIPMENT CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK) NO USER-SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of un-insulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of ele
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Model PA435X Page 3 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 MRC8
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Page 4 Model PA435X Peak/Clip LED Indication: Whenever either amplifier channel output starts to enter a clipping state, a front panel LED will illuminate RED. After the amp stops clipping the LED will return to its normal state 5-6 seconds after clipping stops. Auto Protection Circuit. This feature protects the PA435X if a short or very low impedance is detected at the speaker terminals with each amplifier pair protected separately. Normal operation is restored automatically within
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Model PA435X Page 5 PA435X PANEL AND FEATURE DESCRIPTIONS 1. Front Panel. 17" X 3.5” panel designed for shelf mounting. The unit measures 4” high with the Feet (Item #5). When rack mounting use an adequate rack shelf mount making sure to allow for proper ventilation. FIGURE 2 – THE MODEL PA625X FRONT PANEL – FEATURES AND FUNCTIONS 2. POWER/STANBY SWITCH: § STANDBY MODE: When the front switch is pressed to the IN position, the PA435X may be controlled remotely from th
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Page 6 Model PA435X 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
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Model PA435X Page 7 CAUTION: Be sure to have the rear AC LINE POWER switch (Item #15) turned OFF (O) when changing the position of this switch and when making the corresponding speaker connection changes. 9. FUSE. When required, replace only with a fuse of the same type and rating: § 120 V Version: 6.25 AMP 250 VAC, SLOW BLOW. § 240 V Version: 3.15 A Time-Lag 250 VAC. NOTE: Replacement with a fuse of higher rating will not protect the amplifier and will void the warranty.
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Page 8 Model PA435X INSTALLATION - PHYSICAL LOCATION AND MOUNTING Figure 5 – HORIZONTAL MOUNTING When you mount the PA435X, 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. 2. If mounted in an equipment
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Model PA435X Page 9 NOTE: You should consider some sort of rear support for rack mounted units when used in mobile applications or when located in seismically-active areas. CONNECTING THE PA435X Figure 6 - PA435X Stereo Mode Connections When making connections to the PA435X be sure the power cord is unplugged. Proceed as follows: Stereo Mode Connections 1. Using good quality RCA-type patch cables connect the L and R OUTPUT jacks of the MRC88 Pre Amp Output or other drivi
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Page 10 Model PA435X 5. Be sure to observe correct polarity by connecting the "+" and "–" terminal from each channel on the PA435X to the corresponding "+" and "–" terminals on each speaker. This will ensure correct "phasing" - see Fig. 6 and Speaker Phasing below. Since the connectors are removable, you may unplug them for ease of lead assembly. 6. As a rule of thumb, use 18 gauge speaker wire for speaker runs up to 30' (9m), 16 gauge up to 70' (21m), and 14 gauge up to 150' (39m). Th
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Model PA435X Page 11 Figure 7 – Bridged Mode Connections Bridged Mode Connections In general, it is recommended that the BRIDGED mode not be used in multi-room applications where several speakers are driven through room volume controls and the like. For such applications, use the STEREO mode. Use the BRIDGED mode for single speaker, higher power applications, such as in surround sound systems. Use speakers with an impedance rating of 8-Ohms minimum. To make connections
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Page 12 Model PA435X CAUTION: When operating in the BRIDGED mode (particularly when bench testing the amplifier) do not make a ground or any other kind of connection to the amplifier speaker terminals other than those to the individual speakers as shown. Failures caused by inappropriate connections are not covered under the warranty. Connecting the REMOTE MASTER ON/OFF MUTE CONTROL As mentioned under "PA435X PANEL AND FEATURE DESCRIPTIONS", the REMOTE MASTER ON/OFF CONTROL input
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Model PA435X Page 13 A Multi-Zone System Diagram Using The PA435X and MRC88 Fig. 9, following, shows the PA435X in a typical multi-room system with a Xantech MRC88 eight-zone preamp. Figure 9: Interfacing the PA435X with an MRC88 Zones 7 & 8 In this case: 1. Using good quality RCA Stereo Patch Cords, connect the Preamp Outputs of Zone 7 on the MRC88 to the Left and Right Audio Inputs labeled ‘A’ on the rear of the PA435X. 2. Similar to step 1, connect the Preamp Outputs of Zone
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Page 14 Model PA435X The Remote Amp CO1 & CO2 (Remote Control Jack) from the MRC88 allows for individual Zone control directly from the Zone 7 & 8 keypads of the MRC88 system. When any one of the zones is turned on, the PA435X is powered ON. Similarly, when either Zone is powered down, the associated amplifier pair on the PA435X is put into STANDBY Mode. When both Zones (& & *) are powered down, the PA435X will either go into STANDBY Mode on both amplifier pairs or will be POWERED OFF dep
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Model PA435X Page 15 TROUBLE SHOOTING If you encounter a problem, please review the items in the following list. Be sure, in addition, to check other system components, such as preamplifiers, CD players, speakers, speaker wiring, etc., that may be at fault. PROBLEM PROBABLE CAUSE AND SOLUTION Rear panel Power Indicator does not light – no sound. Check line cord for good contact in a live AC outlet. If REMOTE CI jacks are being used, be sure applied voltage is between +5V and +30V D
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Page 16 Model PA435X SPECIFICATIONS Number of channels 4 Power Output 35 Watts at 8 Ohms Rated continuous power, each channel, all six channels simultaneously driven, 20 Hz to 20kHz, at rated THD Power Output 55 Watts at 8 Ohms Short term continuous, each channel, 2 channels driven, 80 Watts at 4 Ohms 1 kHz, at rated THD Bridged Power Output 150 Watts at 8 Ohms Short term continuous, one pair driven at 1 kHz, at rated THD Rated THD < 0.08% Damping Factor > 100 at 50 Hz, half ra
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Model PA435X Page 17 © 2003 Xantech Corporation
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Page 18 Model PA435X © 2003 Xantech Corporation
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Model PA435X Page 19 © 2003 Xantech Corporation
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Page 20 Model PA435X XANTECH CORPORATION 12950 Bradley Avenue, Sylmar CA 91342-3829 phone 818.362.0353 • fax 818.362.9506 www.xantech.com Part No. 08901190 Rev A 01-31-2003 © 2003 Xantech Corporation
