US Blaster USB 7127 Mode D'emploi page 4

USB 7127-7128
Professional Power Amplifiers
USB 7127 Front panel
1. POWER SWITCH
To turn the unit ON or OFF, press the upper or lower portion of this button. Before turning on the
amplifier, check all connections and turn down the level controls. A momentary muting is normal when
turning the amplifier on or off.
(Caution: Always turn on your power amplifier last, after all your other connected equipment, and
always turn off your power amplifier before your other connected equipment.)
2. POWER LED INDICATORS
These LEDs illuminate when the power is turned "ON".
3. CLIP LED INDICATORS
These LEDs illuminate if any section of the power amplifier's output are within 3dB of clipping.
Occasional blinking of the LEDs are acceptable, but if they remain on more than intermittently you
should turn down either the power amplifier's level controls or reduce the output level of the prece-
ding component to avoid audible distortion.
4. SIGNAL LED INDICATORS
These LEDs illuminate to confirm the presence of an input signal greater than 100 mV at that chan-
nel of the amplifier
5. PROTECT LED INDICATORS
These LEDs illuminate if the power amplifier's output connection is shorted, the load impedance is too
low, or if there is an internal malfunction. When either of these LEDs is lit up, turn OFF the power and
check the output's connection to verify that it is correct, then turn ON the power again.
6. LEVEL CONTROLS
These control the level of signal coming into each channel. The actual voltage attenuation of the
amplifier is shown in dB. Turn these controls counterclockwise if the Limit LEDs illuminate steadily
(indicating a too strong input signal).
7. BRIDGE LED INDICATORS
These LEDs illuminate when the MODE is turned "BRIDGE".
8. PARALLEL LED INDICATORS
These LEDs illuminate when the MODE is turned "PARALLEL".
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