US Blaster USB 7127 Benutzerhandbuch Seite 5

USB 7127-7128
Professional Power Amplifiers
USB 7127 Rear panel
9. POWER CONNECTOR
The cord connector is used to connect an 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 5A-1OA / 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: O.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 on page 7 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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