Installations
Audio Installation: Input Wiring
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| ALESIS CORPORATION, LOS ANGELES | |
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| SOUND REINFORCEMENT DIVISION | |
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| MATICA™ POWER AMPLIFIER | |
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| Patent Pending | |
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| MOUNT IN RACK ONLY. INSTALLER SUR SUPPORT DE MONTAGE SEULEMENT. | |
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| WARNING/AVIS: | |
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| SHOCK HAZARD – DO NOT OPEN | |
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| RISQUE DE CHOC ELECTRIQUE´ | – NE PAS OUVRIR |
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| TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE COVERS. | |
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| NO USER SERVICEABLE PARTS INSIDE. | |
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| REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. | |
MATICA | INPUT | OUTPUT | TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK | |
MODEL | POWER | POWER | DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. | |
500 | 600 VA | 250 W@4Ω |
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900 | 1200 VA | 450 W@4Ω |
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USE CLASS 2
WIRING
120 V
60 Hz
AUDIO INPUT WIRING 
= TIP = PIN 2 = RING = PIN 3 
= SLEEVE = PIN 1
B | BRIDGED | A |
OUTPUT | MONO | OUTPUT |
DUAL
CHANNEL
FOR BRIDGED MONO
USE A INPUT
Figure 2: Amplifier rear panel controls and connections.
Warning: Be sure that the AC power is off prior to connecting or disconnecting any signal wiring.
The input circuits of the Alesis amplifiers are electronically balanced. They may be fed from either symmetrical (ÒbalancedÓ) or unbalanced sources. There are two combination XLR/1/4Ó (6.3 mm) jacks provided, one for each channel, and a barrier screw terminal strip for connecting bare wire or crimp terminals. See Figure 2.
The inputs are wired according to IEC standards:
Connection | XLR | Phone Jack |
Audio Ground | Pin 1 | Sleeve |
High (+) | Pin 2 | Tip |
Low (Ð) | Pin 3 | Ring |
Table 1: Input Wiring |
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Figure 3. Balanced wiring of an XLR input connector.
Figure 4. Unbalanced wiring of an XLR input connector.
8 | Matica 500/900 Reference Manual |