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Amplifiers & Preamplifiers
INSTALLATION INSTRUCTIONS
PA1235
2 CHANNEL POWER AMPLIFIER
123456
POWER
PA1235 12 CHANNEL POWER AMPLIFIER
Fig. 1 The Model PA1235
GENERAL INFORMATION
To enhance the ease of installation and obtain optimum performance from the PA1235, we recommend that
you first become familiar with all its features and special capabilities by studying the descriptions and
instructions in this manual.
The PA1235 was designed to meet the audio power amplifier needs of custom installed
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• 12-11-10-9-8-7-6 Output Flexibility. Each of the 12 amplifiers can be driven singly or bridged to allow several channel and power output capabilities. It can be configured into seven power packages as follows: - Twelve 35-watt amplifiers - 12 total. - One 150 and ten 35-watt amplifiers - 11 total. - Two 150 and eight 35-watt amplifiers - 10 total. - Three 150 and six 35-watt amplifiers - 9 total. - Four 150 and four 35-watt amplifiers - 8 total. - Five 150 and two 35-watt amplifiers - 7 tota
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Amplifiers & Preamplifiers In addition, this switch must be left in the MANUAL OFF (OUT) position to permit an external DC Control Voltage to power the PA1235 ON and OFF. Refer to "REMOTE MASTER ON/OFF CONTROL" terminals, item #13. NOTE: The PA1235 may also be powered ON/OFF with an external AC line switch into which the power cord of the PA1235 is plugged (such as the switched AC outlet of a preamp, timer, etc.). For this type of operation, leave the POWER switch depressed to the MANUAL ON pos
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8 9 10 5 6 7 5 6 7 5 6 7 5 6 7 5 6 7 5 6 7 COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS ® SYLMAR, CA LEFT LOCAL RIGHT LEFT LOCAL RIGHT LEFT LOCAL RIGHT LEFT LOCAL RIGHT COMMON AUDIO LEFT LOCAL RIGHT LEFT LOCAL RIGHT AC 120V 60 HZ BUS 4 AMP 1 2 3 4 5 6 FUSE WARNING CAUTION WARNING WARNING STEREO STEREO STEREO STEREO STEREO STEREO 10 AMP MODE MONO MODE MONO RISK OF ELECTRIC MODE MONO MODE MONO MODE MONO MODE MONO SLOW BLOW TURN POWER TURN POWER TURN POWER BRIDGED BRIDGED SHOCK
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Amplifiers & Preamplifiers 12. SPEAKER Terminals. These plug-in 4-terminal screw type connectors permit speaker wire sizes up to 12 gauge. When making connections for the STEREO mode, be sure to observe the "+" and "–" polarity markings, just under the LEFT & RIGHT markings, for each wire pair going to the speakers. CAUTION: When making connections for the BRIDGED mode, remember, only one speaker is being attached per amplifier pair. Be sure to observe the outer "+" and "–" polarity markin
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• Since it includes adjustable code groups, the user may inadvertently alter the installer configurations. • Also, since the user will require IR commands from other brands of equipment to control the total system, in addition to those of the PA1235, all commands should be consolidated into one learning device, for ease of use. APPLICABLE RC68+ BUTTON DESCRIPTIONS 1. IR Emitter Lens. 2. Instant Volume Presets. These commands allow ran- dom access or direct preset activation of any of 12 fixed 1
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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
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2. If mounted in an equipment cabinet or other confining location, allow at least 2 inches of space above the top cover (see Fig. 4). Be sure there are large openings in the shelf below the unit and in the cabinet to allow the entry of cool air and the escape of warm air. 3. If the cabinet contains other heat generating components or you are using several PA1235's in a large multi-zone system, you will have to pay even closer attention to adequate ventilation. 4. Do not hesitate to use fans (qu
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Amplifiers & Preamplifiers 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). The 4-terminal connectors accept wire sizes up to 12 gauge max. 7. Strip the insulation back about 1/4" (6mm) and twist the strands on each lead to prevent fraying. CAUTION: After lead ends are inserted and the screws tightened down, be sure there are no free strands that could cause shorting! Speaker Phasing To obtain stable imagi
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NOTE: Only one speaker is connected per amplifier pair in the BRIDGED mode! 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. TYPICAL APPLICATIONS Since the PA1235 has an IR control system for each amplifier pair, it can be configu
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Amplifiers & Preamplifiers CONTROLLED SOURCE COMPONENTS Cassette DecK CD Changer Satellite Receiver AM/FM Tuner LR LR V LR LR 286M Dual Blink-IR™ Mouse Emitters (2) RCA type Patch Cords IR Signal 6015900 To Video Distribution (if used) 3.5mm to-stripped-ends mono cable (7) RS41AV 1234 Audio/Video RS41AV VIDEO REMOTE SWITCHER IR Remote Switcher CONFIRM ® EMITTERS AUDIO SYLMAR, CA • MADE IN U.S.A. LEFT 789-44 CONNECTING BLOCK 782 ® AUDIO POWER 15VAC VV G IR IN Type RS41AV RIGHT Power INPUT OUTPUT
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8. To keep the system cost low, no AC power management is included. The user would need to operate the power switching for each component individually, using front panel power switches, or IR, as appropriate. Individual room Standby ON/OFF is provided, however. The STATUS of Standby ON/OFF is indicated at the IR receivers and keypads via the STATUS line connection to each room, as shown. 9. This system is primarily set up to distribute music to each room. A video feed to a single room could al
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Amplifiers & Preamplifiers • CAUTION: The output voltage of some adapters, such as the 781RG, drops off too slowly to provide a quick turnoff for the PA1235. Therefore, when using any adapter (12 VDC max), always connect the included 220 Ohm 1 Watt resistor in shunt with the REMOTE MASTER ON /OFF CONTROL terminals as shown in Fig.9. Failure to do so may result in blowing of the power line fuse (item #10, Fig.3) NOTE: Do not use the 220 Ohm resistor when connecting to the CO terminals of a Z
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CONTROLLED SOURCE COMPONENTS Cassette DecK CD Changer Satellite Receiver AM/FM Tuner LR LR V LR LR 286M Dual Blink-IR™ Mouse Emitters (2) RCA type Patch Cords IR Signal To Video Distribution (if used) RS41AV 1234 RS41AV Audio/Video VIDEO REMOTE SWITCHER IR Remote Switcher CONFIRM ® EMITTERS SYLMAR, CA • MADE IN U.S.A. AUDIO LEFT 789-44 782 CONNECTING BLOCK Type ® AUDIO POWER 15VAC VV G IR IN Power RS41AV RIGHT Supply INPUT OUTPUT Power IR 12VDC RCVR Supply White To AC MAINS striped (Unswitched)
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Amplifiers & Preamplifiers TROUBLE SHOOTING If you encounter a problem, please review the items below. Be sure, in addition, to check other system components, such as preamplifiers, CD players, speakers, speaker wiring, etc., that may be at fault. 1. Front Panel LEDs do not light – no sound. • Check line cord for good contact in a live AC outlet. • If the REMOTE MASTER ON/OFF CONTROL terminals (item #12, Fig. 3) are used, be sure applied voltage is between +5 V and +30 VDC with proper polarity
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SPECIFICATIONS Number of Channels .....................................................................................................................................................12 Power Output Rated Continuous Power, Each Channel: ............................................. 8 Ohms .......................... 35 Watts All 12 channels simultaneously driven, 20 Hz to 20 kHz, at rated THD. Short Term Continuous, Each Channel: ................. 8 Ohms .......................................
