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SECTION I
SRA 400 FRONT AND REAR PANELS
SRA 400 FRONT PANEL
Input Attenuators (Fig. 1 - Item 1)
Each of these two calibrated stepped input at¬
tenuators lowers the input signal level to its respec¬
tive channel, ahead of amplification stages. The gain
of the amplifier is indicated in dBV. The 0 VU CAL
position indicates the calibrated setting at which O
VU (1.23 volts RMS) will drive the amplifier to full
power.
CIRCUIT BREAKER/POWER SWITCH
(Fig. 1 - Item 2)
This combination Circuit Breaker/Power Switch con¬
trols AC power to the SRA 400 unit. The internal
lamp glows green when the power is turned on.
The circuit breaker will shut off AC power in the
event of amplifier overload.
POWER OUTPUT DISPLAYS (Fig. 1 - Item 3)
The ten segment LED bar graph displays indicate
power delivered to the load for each channel. These
electronic displays respond quicker than ordinary
mechanical VU meters, and thus allow accurate
monitoring of program peaks. The displays are cali¬
brated to indicate decibels below rated power (200
watts into 4 ohms, 100 watts into 8 ohms). The dis¬
plays are color coded, with the red LED indicating
full power.
SRA 400 REAR PANEL
CHANNEL 1 INPUT (Fig. 2 - Item 1)
CHANNEL 2 INPUT (Fig. 2 - Item 2)
These phone jacks on each channel are unbalanced
and are used to connect an external signal such as
that from the output of a mixer, to the respective
power amplifier input channel.
CHANNEL 1 OUTPUT (Fig. 2 - Item 3)
CHANNEL 2 OUTPUT (Fig. 2 - Item 4)
For operator convenience, a standard phone jack
and a banana jack, wired in parallel, are provided as
output connectors for each channel. They are used
to connect each speaker enclosure to its respective
channel.The total impedance of the speaker in each
channel should not be less than 4 ohms.
1
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