Advantages Of A Multiple Amplifier System - DOD RTA Signal Processors Owner's Manual

Signal Processors 18-0121-B
S
8 3 4 / 8 3 5
CHANNEL ONE
GAIN LOW LEVEL MID LEVEL
HIGH PASS
0 +15 - 0 -
40 Hz dB dB dB
834 II
series
stereo crossover HIGH PASS GAIN LOW
GAIN
MODE
0 +15
MONO dB
835 II
series
stereo crossover GAIN
I
NTRODUCTION
The DOD 834 Series II is a stereo 3-way, mono 4-way crossover, and the 835
Series II is a stereo 2-way, mono 3-way crossover. These high-quality
crossover networks are designed to extract maximum sound quality from
your multi-amped sound system at a price working musicians can afford.
Accurate state-variable, 18 dB/octave Butterworth filters prevent peaks or dips
in the output at crossover points, ensuring good driver protection by rolling
off crossover frequencies rapidly.
A two-pole, high-pass filter may be electronically inserted at 40 Hz using a
switch on the front panel (834 only), and a variable low frequency summed
output is available for mono subwoofer applications.
The rear panel of the 834/835 is clearly labeled for stereo and mono opera-
tion, and all outputs on the 834 except the mono Low Frequency Sum output
include phase switches.

ADVANTAGES OF A MULTIPLE AMPLIFIER SYSTEM

Multi-amped systems use separate amplifiers for each frequency band, allow-
ing each amplifier to deliver maximum efficiency within a specified range.
This method of amplification yields a cleaner overall sound and a significant
decrease in the amount of power needed to drive the system to the same lev-
els as a full-range amplified system with more power.
The greatest power demands in a sound system are made by the low fre-
quencies of the program material. This is because music and voice signals
contain mostly low frequency information, and low frequency drivers are gen-
erally less efficient than high frequency transducers.
In a multi-amped system, the power amplifier(s) for the low frequencies can
be large enough to handle greater power demands, allowing high frequency
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E R I E S I I
LOW / MID MID / HIGH
CHANNEL TWO
FREQUENCY FREQUENCY
HIGH LEVEL 250 3.7 GAIN LOW LEVEL MID LEVEL
125 1.9
RANGE HIGH PASS
375 5.6
50 500 .75 7.5
0 - 0 Hz kHz 0 +15 - 0 - 0
dB x10 40 Hz dB dB dB
LOW/LOW-MID
FREQUENCY RANGE LOW-MID HIGH-MID
LOW / HIGH
CHANNEL ONE CHANNEL TWO
FREQUENCY
LOW LEVEL HIGH LEVEL 500 GAIN LOW LEVEL
250
RANGE
750
100 1,000
- 0 - 0 0 +15 -
dB dB x10 dB
LOW / MID
LOW LEVEL FREQUENCY RANGE MID LEVEL
Page 11
LOW / MID MID / HIGH STEREO
FREQUENCY FREQUENCY
HIGH LEVEL 250 3.7 10
1.9
125
5
RANGE 5.6 MODE
375
15
.75 7.5
50 500
2 20
- 0 Hz kHz
dB x10 MONO
LOW-MID/HIGH-MID HIGH-MID/HIGH
HIGH FREQUENCY RANGE FREQUENCY MONO
LOW / HIGH STEREO
FREQUENCY
HIGH LEVEL 500
250
RANGE
750
100 1,000
0 - 0
dB dB x10
MID / HIGH
HIGH LEVEL FREQUENCY RANGE MONO