US Blaster USB 7127 Manual Usuario página 11

USB 7127-7128
Professional Power Amplifiers
7128 REAR PANEL
16. MODE SELECTOR SWITCH
These amplifiers offer 3 modes of operation: PARALLEL, STEREO & BRIDGED. Slide the switch to one of the
three positions for you application.
• PARALLEL (MONO) INPUT - This mode allows both channels to operate in parallel with the same signal and
without requiring a Y-cord. In this mode the inputs for both channels are internally connected, so that you
only need to feed a signal into one of the channels. This still allows independent level control of each chan-
nel. It also enables easy "daisy-chaining" with other amps by using the other channel of input connectors .
(Note: Do not select this "Parallel" mode when feeding the amplifier with 2 separate signals.)
(Note: Do not use both unbalanced and balanced cables in the same set-up as that can unbalance all the con-
nections when daisy-chaining, resulting in hum.)
• STEREO INPUT - This is the most common mode generally used, and allows independent control of 2 sepa-
rate signals such as stereo playback, main and monitor live mixes, and bi¬amp operation (highs in one chan-
nel and lows in the other).
• BRIDGED MONO - This mode combines the power of both channels to drive a single speaker. In this mode
the amp produces 4 times the peak power and 3 times the sustained power into a 4 or 8 ohm speaker than
each channel can deliver separately in stereo or parallel mode.
(CAUTION: In this mode the amplifier can deliver high power into a speaker. Make sure that the speaker, con-
nectors and wiring can handle this output. Note that for prolonged overdriven outputs into a 4 ohm speaker
the mains fuse may blow, so care must be taken not to overload the amplifier in such operation.)
Connect the input signal to CH-1 input for bridged mono operation.
17. VENTILATION HOLES
The fan speed is varied automatically to maintain the proper internal operating temperature.
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