Crown Pulse 4X300, Руководство пользователя

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9
5 . 0 C o n t r o l o p e r a t i o n
a. Power Switch
Pressing this switch so that the
white dot is closest to the front
panel signals to the
microprocessor that the user
wishes to turn on the power
supply. Note that the
microprocessor will only switch
the power supply on once it has
assured that there are no
internal faults. From the first
application of AC power it takes
approximately 7 seconds to
complete these tests. During the
test time the microprocessor will flash both the TEMP lights and the FAULT light once a second. If the
amplifier has already completed these tests, then when the switch is pressed, power up will occur within 1
second. While the power up sequence is being completed all amplifiers channels are muted.
b. Level controls 1,2,3 and 4
These controls allow the user to change the sensitivity, or the level required to drive each channel of the
amplifier into clip, from approxi90dBu with the controls fully counter clockwise, to +1dBu with
the controls full clockwise. +1dBu equals approximately 870mV RMS and this level will be just sufficient
with a 4 ohm load and nominal AC voltage to drive the amplifier into clip. If pairs of amplifier channels are
being operated in bridge mode, the channel 1 level controls operate the 1+2 pair volume and the channel 3
level controls the 3+4 pair volume. The controls for channels 2 and 4 do not have any effect in bridge
mode.
Supplied with each PULSE amplifier are special blanking plugs that may be fitted after the control knobs
have been pulled off thus allowing the levels to be set and then made tamper proof.
c. Bridge switches
Located on the rear panel, these switches enable bridge mode
operation. One switch is for channels 1+2, the other for channels 3+4.
Activation of these switches is indicated by the corresponding ‘Bridge’
indicator on the front panel.
When a pair of the amplifier channels is operated in bridge mode, the
power available doubles allowing larger speakers to be driven. Two
things must be kept in mind when bridge mode is used, namely the
minimum impedance that can be driven increases from 2 ohms to 4
ohms and if binding post outputs are used, the speaker wiring must be
changed as described in
4.0 Audio Connections section of this manual.