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MONOPHONIC CONNECTION (Fig. 4)
This shows how a monophonic signal source such as
one program channel of a mixer, can be used to drive
both channels of the SRA 400 power amplifier in
monophonic mode. Set mode switch to mono. Con¬
nect the monophonic signal source to channel 1
input. Both channels will be driven by the input of
channel 1.
MONOPHONIC/MONITOR CONNECTION (Fig. 5)
This diagram shows that if stereo program output is
not necessary, one channel of power amplification in
the SRA 400 may be allocated to the program mate¬
rial, and the other to the monitor material. In the case
illustrated, channel 1 has been allocated to the pro¬
gram material, and channel 2 has been assigned to
the monitor material.
STEREO BI-AMPLIFIED CONNECTION (Fig. 6)
A bi-amplified system can provide increased head-
room, efficiency, damping factor, and decreased
distortion. The SRA 400 power amplifier can be in¬
corporated in bi-amplified sound systems to realize
these advantages. This diagram shows the left and
right program mixes fed to a two channel electronic
crossover, where each channel is frequency divided
into low frequencies and high frequencies. The left
program channel's low frequency material is fed to
the SRA 400 channel 1 input, while the left program
channel's high frequency material is fed to the SRA
400 channel 2 input. The SRA 400 channel 1 output is
connected to the high frequency driver (tweeter) of
the left bi-amplified speaker. The SRA 400 channel 2
output is connected to the low frequency driver
(woofer) of the left bi-amplified speaker. Similarly, the
right program channel's material is processed and
eventually amplified by an additional stereo power
amplifier and fed to a right bi-amplified speaker.
STEREO BI-AMPLIFIED CONNECTION #2 (Fig. 7)
This diagram shows a second bi-amplified scheme
that is widely used. In this stereo system one power
amplifier is used to amplify only the highs, and
another amplifier to process the lows. In most popu¬
lar music low frequency material contains con¬
siderably more energy than high frequency material,
and most sound reinforcement speaker systems
have high frequency drivers which have greater ef¬
ficiencies than their associated low frequency driv¬
ers. As a result, the power amplifier chosen to amplify
the high frequency material need NOT be as power¬
ful as the one chosen to amplify the low frequency
material. In the system shown in Figure 7, the SRA
400 was chosen as the low frequency amplifier.
MONOPHONIC BI-AMPLIFIED
CONNECTION (Fig. 8)
This diagram shows how the SRA 400 can also be
used independently as a monophonic bi-amplified
system.
BRIDGED OUTPUT CONNECTION (Fig. 9)
This diagram shows how the SRA 400 can be used
as a 400 watts single channel amplifier. Set mode
switch to BRIDGED. Connect input to channel 1.
Leave channel 2 input unused. Connect 8 O load
across red banana jacks. Use of smaller loads will
cause protective circuitry to shut off amplifier.
4
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