INPUT SWITCH
The unbalanced input uses a conventional RCA phone jack. Move the input switch to RCA UNBALANCED to use this jack. The balanced input jack is an XLR plug. The XLR jack is connected according to the IEC and AES standard. Move the input switch to XLR BALANCED to use this jack.
Unbalanced Input
Move input switch to RCA UNBALANCED to use RCA connectors
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| XLR Bal |
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| 60 70 | 80 | 90 | OFF |
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| 100 |
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Signal In | 0dB | Signal In |
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| 0 | 2 3 4 |
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(balanced) | (Unbalanced) |
| 1 | 120 |
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| 40HZ |
| Phase @ 80Hz | |||
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| Low Pass | |||||
| Gain |
| 0˚ | ALL OFF | |||||
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| dB relative to |
| RCA Unbal | - 270˚ | 2 | ||||
| max gain in |
| - 180˚ 2 + 3 | ||||||
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| 3dB steps |
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| - 90˚ 2 + 3 + 4 |
Balanced Input
Move input switch to XLR BALANCED to use the XLR connectors
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| XLR Bal |
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| 60 70 | 80 | 90 | OFF |
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Signal In | 0dB | Signal In |
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| 0 | 2 3 4 |
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(balanced) | (Unbalanced) |
| 1 | 120 |
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| 40HZ |
| Phase @ 80Hz | |||
| Gain |
| Low Pass | 0˚ | ALL OFF | ||||
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| dB relative to |
| RCA Unbal | - 270˚ | 2 | ||||
| max gain in |
| - 180˚ 2 + 3 | ||||||
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| 3dB steps |
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| - 90˚ 2 + 3 + 4 |
XLR WIRING CONFIGURATIONS
Using the balanced XLR input is recommended for installations where long cable runs are used or when the potential for stray electromagnetic fields from other wires exists. There are balanced and unbalanced methods in which the XLR inputs can be used. The first method is an XLR Balanced Input using
XLR Balanced Input
Check output from source for proper signal polarity
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| INPUT | FROM | |
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| SOURCE | |
Pin 1 | = GND | 1 | GND | |
Pin 2 | = (+) | |||
3 | – | |||
Pin 3 | = | + | ||
2 |
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XLR Unbalanced Input
Connect
prevent unstable amplifier operation
INPUTFROM
SOURCE
Pin 1 | = GND | 1 | SHIELD |
Pin 2 | = (+) |
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3 | + | ||
Pin 3 | = GND | 2 |
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