Dorrough 40-A User Manual

10
Fig. 11. Sum and Difference Monitors (2 Meters). This interconnect drawing
shows a Sum and Difference Monitor setup by utilizing two "A" or "B" Type
DORROUGH Loudess Monitors. In this application, Sum and Difference
signals can be monitored in real time.
Fig. 12. Broadcast Stereo or Disk Mastering Applications. This interconnect
drawing shows a typical setup for monitoring stereo signals in real time. In
addition, a selectable Sum or Difference Monitor allows the operator to check
the critical phase integrity of the monitored signals. Use either "A" Type or
"B" Type DORROUGH Loudness Monitors.
STL
+
SUM DIFFERENCE
STEREO FEED
R
L
+
-
+
-
-R+-L + -R +-L
LOUDNESS MONITOR
MODEL 40-A
-25
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+ 2
+ 4
+ 6
+ 8
+10
+12
+14
NORMAL
PEAK
RANGE
NORMAL
RANGE
PERSIS
TENCE
dB
dB
LOUDNESS MONITOR
MODEL 40-A
-25
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+ 2
+ 4
+ 6
+ 8
+10
+12
+14
NORMAL
PEAK
RANGE
NORMAL
RANGE
PERSIS
TENCE
dB
dB
Fig. 13. Sound Reinforcement Applications. An "A" Type DORROUGH
Loudness Monitor can be utilized to verify phase integrity of signal pairs
feeding a bank of power amplifiers. In addition, a "B" Type DORROUGH
Loudness Monitor can be used (with bridging resistors) to monitor the
outputs for any power amplifier failure.
STL OR
CUTTING
SYSTEM
+
RIGHT
STEREO FEED
R
L
+
-
+
-
-
+-
LEFT
+ -R +-L
SUM
DIFF
LOUDNESS MONITOR
MODEL 40-A
-25
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+ 2 + 4
+ 6
+ 8
+10
+12
+14
NORMAL
PEAK
RANGE
NORMAL
RANGE
PERSIS
TENCE
dB
dB
LOUDNESS MONITOR
MODEL 40-A
-25
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+ 2 + 4
+ 6
+ 8
+10
+12
+14
NORMAL
PEAK
RANGE
NORMAL
RANGE
PERSIS
TENCE
dB
dB
LOUDNESS MONITOR
MODEL 40-A
-25
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+ 2 + 4
+ 6
+ 8
+10
+12
+14
NORMAL
PEAK
RANGE
NORMAL
RANGE
PERSIS
TENCE
dB
dB
+ -R +-L
SUM
DIFF
POWER
AMPLIFIERS
AUDIO FEEDS
FROM CONSOLE
+
-
LOUDNESS MONITOR
MODEL 40-A
-25
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+ 2
+ 4
+ 6
+ 8
+10
+12
+14
NORMAL
PEAK
RANGE
NORMAL
RANGE
PERSIS
TENCE
dB
dB
+
-
+-
+
-
RELATIVE LOUDNESS TO PEAK MODULATION
MODEL 40-B
dB
dB -36
1.6
-34
-32
-30
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
- 8
- 6
- 4
- 2
0
+1
+2
+3
2
2.5
3.2
4
5
6.3
8
10
12
16
20
25
32
40
50
63
80
100
125
% MODU
LATION
% MODU
LATION

Dorrough 40-A Specifications

General

Brand	Dorrough
Model	40-A
Category	Measuring Instruments
Language	English