US Blaster USB 7127 Mode D'emploi page 10

USB 7127-7128
Professional Power Amplifiers
7128 REAR PANEL
9. POWER CONNECTOR
The cord connector is used to connect the AC power source to your power amplifier.
( CAUTION: Always operate the unit with the AC
ground wire connected to the electrical system ground)
10. FUSE
Fuse holders for 20A/250V fuses. If these fuses continuously. blow, shut off the unit and have it serviced by
qualified service personnel.
11.GROUND LIFT SWITCH
Switch up to disconnect the chassis from ground if necessary to eliminate hum caused by ground loops.
12. SENSITIVITY SELECTOR SWITCH
These amplifiers offer 3 SENSITIVITY of operation: 0.7V 1.0V & 1.44V.
13. COMPRESSOR SELECTOR SWITCH
These amplifiers offer OFF or COMPRESSOR.
The compressor only works when the 1 v sensitivity is selected.
14. L/R CHANNEL OUTPUT CONNECTORS
Connections are as described on the rear panel and in the CONNECTIONS section of this manual.
15. BALANCED INPUT CONNECTORS (XLR)
The XLR connector is compatible with balanced inputs. Since the XLR connector is internally wired in parallel,
you can parallel this unit with another amplifier by using the XLR to output the signal to the input connectors
of the other amplifier. Balanced connections are recommended as they are less prone to AC hum. For long
cable runs a source output impedance of less than 600 ohms is needed to avoid signal loss. For short cable
runs an unbalanced signal input should be suitable. For stereo (two-channel) operation, use the inputs for
both CH-1 and CH-2; for parallel or bridged mono operation, use only CH-1 input. (See MODE SELECTOR
SWITCH below for more explanation.)
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