Wheatstone SP-42 User manual

SP - 40 Series
Audio Production Consoles
Model SP-42 2-track console
Model SP-44 4-track console
Model SP-48 8-track console
TECHNICAL MANUAL
December 1992
Second Edition – For consoles with serial numbers 20556 and up

SP-4 / Dec 92
SP-40 Series Audio Consoles Technical Manual - 2nd Edition
©1992 Wheatstone
®
Corporation
600 Industrial Drive
New Bern, North Carolina 28562
252-638-7000 (Fax [phone])

SP-4 / Apr 00
Addenda
ALL Module Schematics:
All modules now use P&G 8000 series fader with JST connectors. Fader
pinout is as follows:
MONO: STEREO:
Pin 9 HI Pin 9 HI
Pin 8 GND Pin 8 GND
Pin 7 GND Pin 7 GND
Pin 6 WIPER Pin 6 WIPER
Pin 5 NC Pin 5 GND
Pin 4 NC Pin 4 WIPER
Pin 3 NC Pin 3 GND
Pin 2 NC Pin 2 GND
Pin 1 NC Pin 1 HI
If your console's Stereo Line Input Module printed circuit boards
are version SLE-4D, then the following component changes will
apply to the SLE-4C schematics included in this manual:
(1) C70 & C73 capacitor values are changed from 22uF to 100uF.
(2) C71 & C87 capacitor values are changed from 100uF to 22uF.
(3) Integrated circuit U12 (Type 4053) will be implemented differently:
Pins 4, 9, 3 & 5 are now unused (i.e., grounded out) and Pins 14, 11, 13 &
12 are employed instead (i.e., 10K resistor R102 now feeds pin 14, pin 13
feeds capacitor C44, pin 11 feeds pin 9 of U3, and pin 12 goes to ground).
SL-2 Stereo Line Input Module Schematic (SP-42 Console only):
EQ switches "SW2" and "SW4" are not loaded.
GP Group Module Schematic:
If your console is equipped with the optional mix-minus monitor
bus: level control CR2 ("Send 2") is jumper-bypassed and resistor R55
becomes 10KΩ.
If your console has more than one studio module: jumper J6 becomes
a 10KΩresistor and resistor R55 becomes 20KΩ.
Stereo Line Input Schematic (SL-4, SL-42, SL-44, SL-48):
R21 resistor changed from 1K 5% to 4.7K 5%.
Stereo Line Input Schematic (SLE-42, SLE-44, SLE-48):
D7 changed from 1N914 to QMBR130 schottky diode.
Mic/Line Input Modules (MLE-48, MLE-42, MME-48) Schematic
Diagrams:
The SW15 position numbers for Phantom Power and TB To Studio are
incorrectly shown. Phantom Power is position 3, and TB To Studio is
position 4.

Module Removal Tools
Your Wheatstone audio console is equipped with two "module
extractor tools" which are mounted in the front panel of the
console mainframe.
All modules are held into the console mainframe by two mounting
screws (top and bottom) which, whenremoved, leavespecially threaded
holes that accept the two extractor tools.
To remove a module faceplate from the mainframe:
Remove the top and bottom module mounting screws, unscrew the
extractor tools from the mainframe, and screw each tool into a module
mountinghole.Useonlyfourorfive turns (donotover-insert!).Usingthe
extractor tools as handles, pull the module straight up out of the
mainframe.

Contents - Page 1
SP-4 / Dec 92
Table of Contents
CONSOLE OVERVIEW
Series Description............................................................................ 1-1
SP-42/44/48 features table............................................................... 1-2
Input Module Faceplates (dwg)....................................................... 1-3
Mono mic/line input ........................................................................ 1-4
Stereo line input............................................................................... 1-4
Group and Output Module Faceplates (dwg) .................................. 1-5
Group modules ................................................................................ 1-6
Stereo Master Output module.......................................................... 1-4
Control room module ...................................................................... 1-4
Monitor Module Faceplates (dwg) .................................................. 1-7
Accessory Module Faceplates (dwg)............................................... 1-8
Studio module.................................................................................. 1-9
Stereo line selector module ............................................................. 1-9
Tape remote module ........................................................................ 1-9
Superphone module ......................................................................... 1-9
Intercom module............................................................................ 1-10
SP-44 (48) System Signal Flow Diagram ..................................... 1-11
SP-42 System Signal Flow Diagram ............................................. 1-12
Performance Specifications ........................................................... 1-13
INSTALLATION
Placing the Console ......................................................................... 2-1
Console and Cut-out Dimensions .................................................... 2-1
Static VU Alignment ....................................................................... 2-2
Console Power Supply .................................................................... 2-2
Dual Failsafe Supply................................................................... 2-2
System Ground ................................................................................ 2-3
Typical Grounding Scheme (dwg) .............................................. 2-3
Further Grounding Details .......................................................... 2-4
CONSOLE I/O CONNECTIONS
GENERAL ....................................................................................................3-2
AMP Tool Connector System ....................................................................3-2
Balanced vs Unbalanced I/O Connections.................................................3-3
Typical I/O Connections (wiring diagrams) ..............................................3-4
MONO MIC/LINE INPUT MODULE (ML-4)............................................3-5
Audio Connections.....................................................................................3-5
Control Ports ..............................................................................................3-5
Dipswitch Controlled Functions ................................................................3-6

Contents - Page 2
SP-4 / Dec 92
T ABLE OF C ONTENTS
CONSOLE I/O CONNECTIONS (continued)
STEREO LINE INPUT MODULE (SL-4) ...................................................3-7
Audio Connections.....................................................................................3-7
Control Ports ..............................................................................................3-7
Dipswitch Controlled Functions ................................................................3-8
GROUP MODULE (GP-4) ...........................................................................3-9
Audio Connections.....................................................................................3-9
STEREO MASTER OUTPUT MODULE (SM-4).....................................3-10
Audio Connections...................................................................................3-10
CONTROL ROOM MONITOR MODULE (CR-4)...................................3-11
Audio Connections...................................................................................3-11
Auxiliary Control Ports............................................................................3-12
Dipswitch Controlled Functions ..............................................................3-12
STUDIO MONITOR MODULE (optional) (SC-4)....................................3-13
Audio Connections...................................................................................3-13
Control Ports ............................................................................................3-13
Talkback Interrupt Jumpers .....................................................................3-13
SUPERPHONE MODULE (optional) (SPN-4)..........................................3-14
Audio Connections...................................................................................3-14
Control Connections ................................................................................3-14
INTERCOM MODULE (optional) (ICM-4) ..............................................3-15
Audio Input connections ..........................................................................3-15
Control Connections ................................................................................3-15
Audio Output Connections.......................................................................3-15
STEREO LINE SELECT MODULE (optional) (LS-4) .............................3-16
Audio Connections...................................................................................3-16
TAPE REMOTE MODULE (optional).......................................................3-17
OPERATIONAL NOTES
Fader and Level Controls ................................................................ 4-1
Input Assign and Monitor Select Switches ..................................... 4-1
Cueing.............................................................................................. 4-2
Sends................................................................................................ 4-2
Subgroups ........................................................................................ 4-2
Talkback .......................................................................................... 4-2

Contents - Page 3
SP-4 / Dec 92
T ABLE OF C ONTENTS
SCHEMATIC DRAWINGS
Typical module printed circuit board .............................................. 5-2
Mono mic/line input module (SP-44/48)......................................... 5-3
Mono mic/line input module (SP-42).............................................. 5-4
Dual mic input module (SP-44/48).................................................5-4a
Stereo line input module (SP-44/48) ............................................... 5-5
Stereo line input module (SP-42) .................................................... 5-6
Group Module ................................................................................. 5-7
Master Output Module (SP-44/48) .................................................. 5-8
Master Output Module (SP-42) ....................................................... 5-9
Control Room Monitor Module (SP-44/48) .................................. 5-10
Control Room Monitor Module (SP-42) ....................................... 5-11
Studio Monitor Module (SP-44/48) (optional).............................. 5-12
Studio Monitor Module (SP-42) (optional) ................................... 5-13
Stereo Line Select Module (optional)............................................ 5-14
Superphone Module (optional)...................................................... 5-15
Intercom Module (optional) .......................................................... 5-16
Tape Remote Module (optional) ................................................... 5-17
Digital Timer ................................................................................. 5-18
Power Supply................................................................................. 5-19
Failsafe Switchover Panel (optional)............................................. 5-20
TROUBLESHOOTING
Basic Troubleshooting Procedures .................................................. 6-1
Integrated Circuits ........................................................................... 6-2
Other Details.................................................................................... 6-3
SP-4 / April 95

Page 1 - 1
SP-4 / Dec 92
C ONSOLE O VERVIEW
Console Overview
CHAPTER CONTENTS
Series Description............................................................................ 1-1
SP-42/44/48 features table............................................................... 1-2
Input Module Faceplates (dwg)....................................................... 1-3
Mono mic/line input ........................................................................ 1-4
Stereo line input............................................................................... 1-4
Group and Output Module Faceplates (dwg) .................................. 1-5
Group modules ................................................................................ 1-6
Stereo Master Output module.......................................................... 1-4
Control room module ...................................................................... 1-4
Monitor Module Faceplates (dwg) .................................................. 1-7
Accessory Module Faceplates (dwg)............................................... 1-8
Studio module.................................................................................. 1-9
Stereo line selector module ............................................................. 1-9
Tape remote module ........................................................................ 1-9
Superphone module ......................................................................... 1-9
Intercom module............................................................................ 1-10
SP-44 (48) System Signal Flow Diagram ..................................... 1-11
SP-42 System Signal Flow Diagram ............................................. 1-12
Performance Specifications ........................................................... 1-13
SP–40 SERIES DESCRIPTION
The Wheatstone SP-40 console series is a dual purpose design intended for
applications where the console will be used for both production work and on-
air applications. As such, its module layout has characteristics similar to both
traditional on-air boards and production models. Generally speaking, the
lower half of a typical input module emulates on-air control layout, while the
upper half contains equalization and send controls. This hybrid architecture
allows both production and on-air personnel to easily learn and operate all
models of the series.
There are three models: the SP-42 (intended for 2-track use), the SP-44 (4-
track) and the SP-48 (8-track). All models are similar in layout, but differ
primarily in the number of outputs available. The standard model is the SP-44.
SP-44 Four-track Production Console
This console comes equipped with four subgroups, two stereo outputs
(Program and Audition), one mono sum output (Program L+R), one mix-
minus output, three auxiliary sends and cue. Intended to interface with a four-
track tape recorder (the subgroup outputs feed the recorder; multitrack playback
is normally through the subgroups' tape inputs), the console may be ordered
with 16 or 24 input channels. The mainframe includes VU meters for the
subgroups, Program (left & right), Audition (left & right), and Mono (Program
L+R). Group VUs can also meter the three sends and mix-minus, via front
panel switching on the subgroup modules. A control room monitor module is
standard equipment. The mainframe has room for five accessory modules
(three on the right and two on the left).

Page 1 - 2
SP-4 / Dec 92
C ONSOLE O VERVIEW C ONSOLE O VERVIEW
SP-48 Eight-track Production Console
This is the 8-track version of the console series. It is identical with the SP-
44 except it has eight subgroup channels instead of four. This also means there
are an additional four VU meters housed in the mainframe. The SP-48 comes
with 24 inputs.
SP-42 Two-track Transfer Console
This compact unit (26 by 26 inches) has 12 inputs and is designed to interface
directly to a 2-track tape machine. It has two stereo outputs (Program and
Audition), two auxiliary sends and cue. Four VU meters (Program and
Audition left and right) are included. The mainframe includes a control room
monitor module and has room for two accessory modules (righthand frame
positions only).
SP- 40 Series Standard Features Listing by Console Model
SP-40 CONSOLE SERIES FEATURES
SP-42
SP-44
SP-48
MAINFRAME POSITIONS
16
24/33
35
INPUTS
12
16/24
24
GROUPS
4
8
CONTROL ROOM MODULE
Y
Y
Y
STEREO PROGRAM OUT
Y
Y
Y
STEREO AUDITION OUT
Y
Y
Y
MONO SUM (PGM L+R) OUT
Y
Y
MIX-MINUS OUT
Y
Y
CUE
Y
Y
Y
SEND BUSSES
2
3
3
TIMER
Y
Y
Y
GROUP METERS
4
8
PROGRAM METERS (L & R)
Y
Y
Y
AUDITION METERS (L & R)
Y
Y
Y
SEND METERS (switched w/Group VUs 1-3)
Y
Y
MIX-MINUS METER (switched w/Group VU 4)
Y
Y
LEFTHAND ACCESSORY POSITIONS
2
2
RIGHTHAND ACCESSORY POSITIONS
2
3
3

Page 1 - 3
SP-4 / Dec 92
C ONSOLE O VERVIEW
Input Modules – SP-40 Series Audio Consoles
Mono Input
SP-42 Mono Input SP-44 Mono Input SP-48 Stereo Input SP-42 Stereo Input SP-44 Stereo Input SP-48
ML- 4
GAIN10 9
8
7
6
5
4
3
2
10
MIC / LINE
M
I
C
16 14
-dB+
11
6
3
0
3
6
11
1416
10K/ 5K
PHASE
100 / 50
-dB+
11
3
0
3
11
-dB+ 1614
11
6
3
0
3
6
11
14 16
EQ IN
A
S
S
I
G
N
C
L R
P
A
N
1
2
3
4
B
U
S
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
S2 9
8
7
64
3
2
1S1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
L
PAN
LEVEL
dB
5
LINE
TRIM
SL- 4
A / B LINE
16 14
-dB+
11
6
3
0
3
6
11
14 16
1K / 500
-dB+ 1614
11
6
3
0
3
6
11
14 16
EQ IN
A
S
S
I
G
N
C
L R
B
A
L
1 / 2
3 / 4
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
9
8
7
64
3
2
1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
LT
RT
GAIN
-dB+
11
6
3
0
3
6
11
14 16 16 14
B
B
U
S
5
SL- 2
A / B LINE
16 14
-dB+
11
6
3
0
3
6
11
14 16
1K / 500
-dB+ 1614
11
6
3
0
3
6
11
1416
EQ IN
A
S
S
I
G
N
C
L R
B
A
L
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
CUE
LT
RT
GAIN
-dB+
11
6
3
0
3
6
11
1416 16 14
1
10 9
8
7
64
3
2
10
2
10 9
8
7
6
5
4
3
2
10
PRE IN
S
E
N
D
S
B
5
ML- 48
GAIN10 9
8
7
6
5
4
3
2
10
MIC / LINE
M
I
C
16 14
-dB+
11
6
3
0
3
6
11
14 16
10K/ 5K
PHASE
100 / 50
-dB+
11
3
0
3
11
-dB+ 1614
11
6
3
0
3
6
11
1416
EQ IN
A
S
S
I
G
N
C
L R
P
A
N
1 / 2
3 / 4
5 / 6
7 / 8
B
U
S
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
9
8
7
64
3
2
1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
L
dB
5
LINE
TRIM
ML- 2
GAIN10 9
8
7
6
5
4
3
2
10
MIC / LINE
M
I
C
16 14
-dB+
11
6
3
0
3
6
11
1416
10K/ 5K
PHASE
100 / 50
-dB+
11
3
0
3
11
-dB+16 14
11
6
3
0
3
6
11
1416
EQ IN
A
S
S
I
G
N
C
L R
P
A
N
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
CUE
110 9
8
7
64
3
2
10
210 9
8
7
6
5
4
3
2
10
PRE IN
S
E
N
D
S
L
dB
5
LINE
TRIM
S2S1
PAN
LEVEL S2S1
BAL
LEVEL
SL- 48
A / B LINE
16 14
-dB+
11
6
3
0
3
6
11
14 16
1K / 500
10K / 5K
100 / 50
-dB+16 14
11
6
3
0
3
6
11
14 16
EQ IN
A
S
S
I
G
N
C
L R
B
A
L
1 / 2
3 / 4
5 / 6
7 / 8
B
U
S
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
9
8
7
64
3
2
1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
LT
RT
GAIN
-dB+
11
6
3
0
3
6
11
14 16 16 14
B
5
S2S1
BAL
LEVEL
8K 7K
5K2K
500
400
Hz
8K 7K
5K2K
500
400
Hz
8K 7K
5K2K
500
400
Hz
AUD
PGM
ON
OFF
AUD
PGM
ON
OFF
AUD
PGM
ON
OFF
PGM
AUD
ON
OFF
AUD
PGM
ON
OFF
ON
AUD
OFF
PGM

Page 1 - 4
SP-4 / Dec 92
C ONSOLE O VERVIEW
STANDARD MODULES
Mono Mic/Line Input (ML-48)
This module brings mic signals into the console; when switched to line input
it is used to play individual tracks from the multi-track machine.
Familiar PGM and AUD switches are provided for on-air application and
rapid learning curves. They also make easy work of routine 2–track transfers
and dubs. Bus assign switches are also provided for 8–track production
sessions. Additionally, there is an internal dipswitch feeding a mix-minus
bus—perfect for call-in production work. A powerful three-band equalizer
permits total creative freedom (the EQ may be switch bypassed). The panpot
pans between the left and right PGM and AUD buses or Odd and Even pairs
on the bus assign switches. Three auxiliary sends are provided. Sends 1 and
2 appear on a concentric knob pair (Level and Pan 1/2); they may be switched
pre or post. Send 3 can be internally selected pre or post. A CUE switch (w/
LED) is also provided. CUE is automatically released when the channel on
button is activated or when CUE is pressed again. CUE may be programmed
to automatically interrupt control room or headphone feeds.
Other features include dipswitch selected phantom power, a phase reverse
switch and a mic/line selector switch. Separate mic gain and line trim controls
are provided.
The lower section of the module includes a P&G fader. Channel ON/OFF
switches interface to the console’s dipswitch programmed logic system, which
allows remote channel on, off, tally and cough. Console command functions
include control room and studio mute, and timer restart. Of course, control
room and studio tally relays are included. These permit an on-air type
production environment as well as direct-to-air capability.
Stereo Line Input (SL–48)
This module is used for stereo sources such as CDs, tape recorders, and
cassette players. Its A/B source selector switch doubles the module’s input
capacity. Calibration procedures are made easy with the multi-turn front panel
gain trims. The 3-band EQ section (with switchable center frequencies)
provides reciprocal curves, allowing easy removal of previously applied
equalization—a real plus for last minute afterthoughts. EQ bypass is provided.
Assign switches route signal to the stereo and 8-track machine in stereo
pairs, and are provided with a balance control. The SP-48’s unique stereo/
mono send section provides for mono or stereo effects. Pre/post selector
switches increase production flexibility. Like the mono mic module, a
sophisticated automatic CUE system is included. A P&G stereo fader provides
smooth, troublefree mixing.
Channel ON/OFF buttons are coupled to an on-air type machine and console
logic system. Each color-coded button is illuminated. For long life and low
maintenance, on/off lamps are solid state. When channel on status is selected,
external machines, such as carts and CDs, may be started and can in turn send
channel on/off commands back to the console. The logic system may be
dipswitch selected to command control room and studio mute, and timer
restart. A local or external ready command may signal back to the module.

Page 1 - 5
SP-4 / Dec 92
C ONSOLE O VERVIEW
Group & Output Modules – SP-40 Series Audio Consoles
Group #1
SP-44/48 Group #2 SP-44/48 Group #3 SP-48 only Group #4 SP-48 only Stereo Master SP-42 Stereo Master SP-44/48
GP- 4
G1 / S1
0
5
10
15
20
30
40
50
60
70
0
0
CUE
10 9
8
7
6
5
4
3
2
10
10 9
8
7
6
5
4
3
2
10
G2 / S2
VU
GRP
SND
G1
VU
G2
G1
GAIN
G2
C
L R P
A
N
C
L R
1
2
210 9
8
7
6
5
4
3
2
10
1
10 9
8
7
6
5
4
3
2
10
T
A
P
E
L
E
V
E
L
G2
GROUPS
1
2
S1
S2
R
R
G1
TAPE TO PAN
CUE
CUE
A
S
S
I
G
N
2
1
MIX
REC
MIX
REC
G2
G1
P
P
PGM
1
2
M
A
S
T
E
R
S
S
E
N
D
S
E
N
D
GP- 4
G3 / S3
0
5
10
15
20
30
40
50
60
70
0
0
CUE
10 9
8
7
6
5
4
3
2
10
10 9
8
7
6
5
4
3
2
10
G4 / M–
VU
GRP
SND
G3
VU
G4
G3
GAIN
G4
C
L R P
A
N
C
L R
3
4
410 9
8
7
6
5
4
3
2
10
310 9
8
7
6
5
4
3
2
10
T
A
P
E
L
E
V
E
L
G4
GROUPS
3 4
S3
M–
R
R
G3
TAPE TO PAN
CUE
CUE
A
S
S
I
G
N
4
3
MIX
REC
MIX
REC
G4
G3
P
P
PGM
3
S
E
N
D
M
X
M
M
A
S
T
E
R
S
GP- 4
0
5
10
15
20
30
40
50
60
70
0
0
CUE
G5
VU
G6
G5
GAIN
G6
C
L R P
A
N
C
L R
5
6
610 9
8
7
6
5
4
3
2
10
510 9
8
7
6
5
4
3
2
10
T
A
P
E
L
E
V
E
L
G6
GROUPS
5 6
R
R
G5
TAPE TO PAN
A
S
S
I
G
N
6
5
MIX
REC
MIX
REC
G6
G5
P
P
PGM
GP- 4
0
5
10
15
20
30
40
50
60
70
0
0
CUE
G7
VU
G8
G7
GAIN
G8
C
L R P
A
N
C
L R
7
8
810 9
8
7
6
5
4
3
2
10
710 9
8
7
6
5
4
3
2
10
T
A
P
E
L
E
V
E
L
G8
GROUPS
7 8
R
R
G7
TAPE TO PAN
A
S
S
I
G
N
7
7
MIX
REC
MIX
REC
G8
G7
P
P
PGM
SM- 2
LT
RT
AUD
LT
PGM
AUD
BUS
TAPE
RT
LT
PGM
RT
LT
RT
AUD
PGM
VU
GAIN
MASTER
10 9
8
7
6
5
4
3
2
10
A
U
D
0
5
10
15
20
30
40
50
60
70
0
0
PGM
MASTER
T
T
SM- 4
MASTER
10 9
8
7
6
5
4
3
2
10
P
G
M
MONO
LT
RT
AUD
LT
PGM
AUD
BUS
TAPE
RT
LT
PGM
RT
LT
RT
AUD
PGM
VU
GAIN
M
O
N
O
MASTER
10 9
8
7
6
5
4
3
2
10
A
U
D
0
5
10
15
20
30
40
50
60
70
0
0
PGM
MASTER
T
T
10 9
8
7
6
5
4
3
2
10
10 9
8
7
6
5
4
3
2
10
CUE
CUE
1
2
M
A
S
T
E
R
S
S
E
N
D
S
E
N
D

Page 1 - 6
SP-4 / Dec 92
C ONSOLE O VERVIEW
Group Modules (GP)
These modules provide the record outputs to the tape recorder during the
multi-track lay-up, and provide subgrouping functions during mixdown ses-
sions.
Each fader (two to a panel) controls the level of one track sent to the multi-
track recorder. By acting as a record level to the tape recorder modulation levels
can be precisely controlled from one fader, rather than having to adjust
individual or groups of different faders, thus greatly improving productivity
and avoiding the chance of losing the mix balance.
Once the eight tracks are recorded, the mixdown session can be handled in
one of two ways. First, Bus/tape switches are switched to select the tape
playback signals, which are routed through the group faders and their associ-
ated panpots to the PGM stereo output. In the second method the bus/tape
switch is left in Bus mode and the mic/line modules are switched to line input
(which are also connected to the tape machines playback); signals are then
routed from the input module, grouped to the subgroups, and then mixed to the
stereo output. This leaves the operator the choice of fast layups or more
involved sessions when you’re looking for that major market polish.
A CUE switch allows quick checking of the recording or subgroup signal.
The pan off switch allows the groups to operate independently of the stereo mix
for mix-minus, IFB, or bilingual production requirements, or in applications
where it is desirable to feed the multi-track while simultaneously using the
stereo PGM buses for other applications, such as dubbing or even live use.
Master level controls for the three auxiliary sends and the internal mix-minus
bus are located at the top of the first two group modules. Front panel gain and
VU multi-turn trimmers allow easy calibration.
Stereo Master Output (SM–4)
This module provides master output level control for the PGM, AUD and
PGM mono sum outputs. PGM master is provided with a stereo P&G fader that
would normally be used as the record level control to your 2–track master or
output level to your on-air feed. A pair of bus/tape switches are provided that
allow you to bring the input of your 2–track back to the module so you may
easily check your completed recordings. The AUD and PGM mono outputs are
both provided with conductive plastic rotary level controls. Front panel multi-
turn gain and VU trims allow easy calibration.
Control Room Monitor (CR-4)
This standard module handles source and level controls to the control room,
headphone and cue circuits. The source selector can pick up the PGM, AUD,
and MONO buses as well as two external balanced line inputs, such as tape
recorders or air returns. The CUE circuit can be programmed to interrupt the
control room or headphone feeds for automatic operation. A high quality
conductive plastic headphone level control is provided to assure reliable
operation. The under- counter headphone jack is driven by a built-in power
amplifier to assure plenty of drive. An external headphone I/O port is also
provided for an external power amp if desired. The CR pot is conductive plastic
and drives an electronically balanced output.

Page 1 - 7
SP-4 / Dec 92
C ONSOLE O VERVIEW
Monitor Modules – SP-40 Series Audio Consoles
Control Room
SP-42 Control Room SP-44/48 Studio (opt.) SP-42 Studio (opt.) SP-44/48
10 9
8
7
6
5
4
3
2
10
CUE
HDPN
10 9
8
7
6
4
3
2
10
5
CR
10
9
8
7
6
4
3
2
1
0
5
CR- 2
TB
10 9
8
7
6
5
4
3
2
10
STUDIO
10 9
8
7
6
4
3
2
10
5
SC- 2
TB
10 9
8
7
6
5
4
3
2
10
CUE
HDPN
10 9
8
7
6
4
3
2
10
5
CR
10
9
8
7
6
4
3
2
1
0
5
CR- 4
TB
10 9
8
7
6
5
4
3
2
10
STUDIO
10 9
8
7
6
4
3
2
10
5
SC- 4
TB
EXT1
EXT2
PGM
AUD
MON
S
O
U
R
C
E
S
E
L
E
C
T
EXT1
EXT2
PGM
AUD
MON
S
O
U
R
C
E
S
E
L
E
C
T
EXT1
EXT2
PGM
AUD
S
O
U
R
C
E
S
E
L
E
C
T
EXT1
EXT2
PGM
AUD
S
O
U
R
C
E
S
E
L
E
C
T
AUTO
RESTART
H
O
L
D
R
E
S
E
T
S
T
A
R
T
S
T
O
P
TIMER
AUTO
RESTART
H
O
L
D
R
E
S
E
T
S
T
A
R
T
S
T
O
P
TIMER

Page 1 - 8
SP-4 / Dec 92
C ONSOLE O VERVIEW
Accessory Modules – SP-40 Series Audio Consoles
Stereo Selector Tape Remote Superphone Intercom
TR- 4 ICM- 4
S
O
U
R
C
E
S
E
L
E
C
T
LS- 4 SPN-4
A
S
S
I
G
N
RECORD
EXT
MIC
TRIM
PGM
ON
OFF
0
5
10
15
20
30
40
50
60
70
0
0
2
AUD
MXM
CALL 1
CALL 2
1
CUE CALLER
READY
INTERCOM
MIC
NULL
BUSY
PRIVACY
>>
<<
PLAY
REC
STOP
>>
<<
PLAY
REC
STOP
TR- 4

Page 1 - 9
SP-4 / Dec 92
C ONSOLE O VERVIEW
The following programmable functions are available: CUE may be pro-
grammed to interrupt HDPN or CR monitor; HDPN interrupt receives the CUE
signal; CR interrupt provides a split feed, with PGM on left and CUE on the
right (interrupts are dipswitch-selectable). This module also includes a control
room mute circuit, which may be activated from an appropriately pre-pro-
grammed input channel, and also includes an on-air tally relay. This module
also houses the optional timer control panel. Controls include timer START/
STOP, RESET and HOLD buttons. An AUTO-RESTART enable switch links
the timer to automatically restart from pre-programmed input channels.
OPTIONAL MODULES
Studio Module (SC–4)
The optional studio control module is provided with a source selector similar
to the CR module, a conductive plastic studio level control (with electronically
balanced output) and a talkback-to-studio circuit. The TB switch routes the
announcer’s mic to the studio output and also an external TB out port. The TB
level control is used to preset the TB level to the studio independently of the
studio level pot. This module also includes a studio mute circuit, which may
be activated from an appropriately pre-programmed input channel. An on-air
tally relay is included.
Stereo Line Selector (LS–4)
A source select switchbank with 6 stereo inputs and one stereo output. The
output may be fed (via the module’s standard DB-25 I/0 connectors) to any line
input module, control room or studio module to increase its input source
capacity.
Tape Remote Module (TR–4)
Available in two versions: Full Function (FF-2, with full control of two
machines) and Start/Stop (SS-6, six pairs of start/stop buttons for control of six
different machines). All buttons have LED indicators.
Superphone Module (SPN–4)
This module provides a new way of handling telephone segments: when a
phone segment is desired, the announcer simply activates the module, and all
mute, level and combining functions are handled automatically. It automati-
cally selects the announcer’s mic and mix-minus sources with a press of its ON
button and allows conferencing between two callers (each on their own fader)
and the station’s microphones. Caller CUE switches provide a quick way to
preview the callers, or even conduct the segment through the console’s cue
speaker. The PGM assign switch permits live talk-ins. An AUD input switch
allows callers to receive any additional channels that have been assigned to the
AUD bus. The MXM internal programming switches can be preset for your
SP-4 / June 93

Page 1 - 10
SP-4 / Dec 92
C ONSOLE O VERVIEW
normal talk segment, so the operator would hit the ON button and his mic and
the MXM signals would be routed to the callers. It even has a balanced external
input port—handy for remotes.
The module has logic circuitry linked to its ON/OFF switches that can start
and stop an external tape machine, initiate record, activate cue, mute control
room and studio, and restart the console timer—all from channel ON/OFF
switches. It provides separate multitrack tape recorder feeds that route an-
nouncer mics and program material to track 1, a composite announcer and caller
sum to track 2, and callers only to tracks 3 & 4. By splitting the mics from the
callers, the operator can edit by using simple track punch-ins rather than razor
edits.
Intercom Module (ICM–4)
This module is a major advance beyond the simple control room talkback
button. The operator can communicate with the studio (as with traditional TB),
but he can also talk with other studios and control rooms throughout the entire
station complex. It is part of an integrated intercom system; a family of modules
available for all Wheatstone radio consoles, plus a rackmount version for
equipment room installation. It also interfaces with the Wheatstone TS-500
Talent Station.
When a call button is pressed, the anxnouncer mic is routed to any one of six
destinations. The operator at the receiving end will hear the caller’s voice
through the cue speaker (unless, of course, he’s on-the-air) and he can answer
hands free to the initiating caller. A tally lamp at the receiving end illuminates
to indicate which intercom station is initiating the call. The privacy button will
mute the announcer’s mic. Each module is self-powered from its host console,
and a simple daisy chain interface is all that’s required for installation.
SP-4 / June 93

L
HPGM
MONO
LEVEL
GAIN
GAIN
L
H
L
H
PGM
OUT
BUS/
TAPE
L
H
TAPE
IN
L
H
VU
CAL
CAL
GAIN
GAIN
L
H
L
H
BUS /
TAPE
L
H
TAPE
IN
L
H
VU
CAL
VU
CAL
VU
CAL
OUT
AUD
L
E
V
E
L
F
A
D
E
R
L
H
L
H
L
H
L
H
L
H
L
H
CR
OUT
CUE TO HDPN
SPLIT CUE
DIP SW
CUE
LOGIC
MUTE
LOGIC
L
E
V
E
L
M
U
T
E
ON-AIR
TALLY
OPTO
HDPN
JACK
LT
RT
HDPN
LEVEL
EXT 2
EXT 1
PGM
AUD
MONO
CUE
OUT
HDPN
INTRPT
SW
CR
CUE
LEVEL
LT
RT
LT
RT
L
H
L
H
STUDIO
OUT
MUTE
LOGIC
L
E
V
E
L
M
U
T
E
STUDIO
/TB
INTRPT
FET SW
LT
RT
PGM
AUD
MONO
EXTERNAL
TB OUT
TB MUTE
FET SW
STUDIO
TB
LEVEL
LT
RT
OFF TB COUGH
ON
TO MIC CHANNEL LOGIC PORT
REMOTE
MIC
CONTROLS
REXT 1
L
REXT 2
L
R
L
REXT 4
L
REXT 5
L
REXT 6
L
EXT 3
R
L
EDIT
>>
<<
PLAY
REC
STOP
EDIT
>>
<<
PLAY
REC
STOP
LINE SELECT
RESET
HOLD
STEREO
MASTER
CR MONITOR
STUDIO MONITOR
TAPE
REMOTE
SP-40 CONSOLE SERIES
SYSTEM FLOW DIAGRAM
INTERCOM
LOGIC
I/O PORT
2-WAY
AUDIO H
L
LISTEN
FET SW
MIC
NULL
TALK
FET SW
FM
AM
NEWS
PROD
BOOTH
ENG
CALL LINES
To Other Stations
TB MIC
IN
TIMER
CLOCK
S / S
AUTO
VU
EQ -IN
GAIN
ON
OFF
ON TALLY
OFF TALLY
MIC / LINE INPUT
COUGH
+48v
L
H
L
H
TRIM
M / L
SW EQ
L
H
OUT
L
H
IN
1
2
3
4
PAN
L
R
SEND
1 / 2
SEND
3
PRE
POST
CUE
FET SW
F
A
D
E
R
MIX-MINUS
DIP SW
TIMER RESTART
STUDIO MUTE
CR MUTE
ON
CUE
PATCH
MIC
LINE
LOGIC
J
J
TB TO STUDIO
PAN
D
I
P
A - COMMON
TB
B - COMMON
PHASE
SW
OFF
CUE LOGIC
PGM
AUD
ON
FET SW
TRIM
ON
OFF
START
STOP
READY
COMMON
EQ -IN
PAN
SEND
1 / 2
SEND
3
PRE
POST
DIP SW
ON
CUE
LOGIC
J
TRIM
L
H
L
H
L
H
L
H
L
A
1 - 2
3 - 4
5 - 6
7 - 8
L
R
R
TIMER RESTART
B
A
L
O
N
F
A
D
E
R
PGM
AUD
L
R
A
B
S
E
L
E
C
T
E
Q
OFF
CUE LOGIC
A / B LOGIC
STEREO LINE INPUT
CUE
FET SW
LOCAL READY
SEPARATE
FOR A & B
CR
INTRPT
FET SW
AUD
ON SW
L
H
L
H
ON
MIX
MINUS
Monitor
DIP SW
MIC
IN L
HMIC
TRIM
AUD
Monitor
HYBRID
1 IN CALL 1
FADER
MXM
ON SW
HYBRID
2 IN CALL 2
FADER
SUPER
PHONE
OFF
CALL 1
CUE SW
CUE LOGIC
COMPOSITE
OUT
MICS TO
TRK 1
TO HYBRID
1
TO HYBRID
2
CALLERS
TO TRK
3 & 4
TRIM
TRIM
TRIM
TRIM
TRIM
R
L
EXT
IN L
HON
FET SW
PGM
SW
START
STOP
COMMON
LOGIC
REC
READY
SW TRIM
PROGRAM
AUDITION
MONO
LT
RT
LT
RT
PAN
GAIN
L
H
L
H
TAPE
OUT
TAPE IN
TAPE
LEVEL
L
H
LEVEL
VU
L
H
LEVEL
GROUP MASTER #1
SEND 1
CUE SW
TAPE
TO PAN
SW
PGM
SW
GROUP
FADER
GROUP
/SEND
VU SW
PAN
GAIN
L
H
L
H
TAPE
OUT
TAPE
LEVEL
VU
TAPE
TO PAN
SW
PGM
SW
GROUP
FADER
GROUP
/SEND
VU SW
CAL
CAL
SEND
1
OUT
SEND
2
OUT
SENDS
CHANNEL 1
TAPE IN
CHANNEL 2
CUE LOGIC
CR MUTE
∑∑
LT
RT
B
LT
RT
REC READY
CUE LOGIC ENABLE
TIMER RESTART
STUDIO MUTE
CR MUTE W/PGM
CR MUTE
STUDIO MUTE W/PGM
MIX-MINUS
MICS to
PGM
EXT
TRIM
∑
CALL 2
CUE SW
∑
SEND 2
CUE SW
∑
CUE
MUTE
FET SW
CUE MUTE
ENABLE
L
R
L
R
∑
L
H
L
H
L
H
L
HEXT 2
EXT 1
L
R
L
R
TB
SW
∑
STUDIO
TALLY
OPTO
TRIM
TO
CUE
SPKR
L
HJ
LINE IN
PRIVACY
SWITCH
DIPSW
F
E
T
S
W
System Flow Diagram — SP-44 (48) Series Audio Console Page 1 - 11

GAIN
GAIN
L
H
L
H
PGM
OUT
BUS/
TAPE
L
H
TAPE
IN
L
H
VU
CAL
CAL
GAIN
GAIN
L
H
L
H
BUS /
TAPE
L
H
TAPE
IN
L
H
VU
CAL
VU
CAL
OUT
AUD
L
E
V
E
L
F
A
D
E
R
L
H
L
H
L
H
L
H
L
H
L
H
CR
OUT
CUE TO HDPN
SPLIT CUE
DIP SW
CUE
LOGIC
MUTE
LOGIC
L
E
V
E
L
M
U
T
E
ON-AIR
TALLY
OPTO
HDPN
JACK
LT
RT
HDPN
LEVEL
EXT 2
EXT 1
PGM
AUD
CUE
OUT
HDPN
INTRPT
SW
CR
CUE
LEVEL
LT
RT
LT
RT
L
H
L
H
STUDIO
OUT
MUTE
LOGIC
L
E
V
E
L
M
U
T
E
STUDIO
/TB
INTRPT
FET SW
LT
RT
PGM
AUD
EXTERNAL
TB OUT
TB MUTE
FET SW
STUDIO
TB
LEVEL
LT
RT
OFF TB COUGH
ON
TO MIC CHANNEL LOGIC PORT
REMOTE
MIC
CONTROLS
REXT 1
L
REXT 2
L
R
L
REXT 4
L
REXT 5
L
REXT 6
L
EXT 3
R
L
EDIT
>>
<<
PLAY
REC
STOP
EDIT
>>
<<
PLAY
REC
STOP
LINE SELECT
RESET
HOLD
STEREO
MASTER
CR MONITOR
STUDIO MONITOR
TAPE
REMOTE
SP-42 AUDIO CONSOLE
SYSTEM FLOW DIAGRAM
INTERCOM
LOGIC
I/O PORT
2-WAY
AUDIO H
L
LISTEN
FET SW
MIC
NULL
TALK
FET SW
FM
AM
NEWS
PROD
BOOTH
ENG
CALL LINES
To Other Stations
TB MIC
IN
TIMER
CLOCK
S / S
AUTO
VU
EQ -IN
GAIN
ON
OFF
ON TALLY
OFF TALLY
MIC / LINE INPUT
COUGH
+48v
L
H
L
H
TRIM
M / L
SW EQ
L
H
OUT
L
H
IN L
R
SEND
1
SEND
2
PRE
POST
F
A
D
E
R
MIX-MINUS
DIP SW
TIMER RESTART
STUDIO MUTE
CR MUTE
ON
CUE
PATCH
MIC
LINE
LOGIC
J
TB TO STUDIO
PAN
D
I
P
A - COMMON
TB
B - COMMON
PHASE
SW
OFF
CUE LOGIC
PGM
AUD
ON
FET SW
TRIM
ON
OFF
START
STOP
READY
COMMON
EQ -IN
SEND
1
SEND
2
PRE
POST
DIP SW
ON
CUE
LOGIC
J
TRIM
L
H
L
H
L
H
L
H
L
A
L
R
R
TIMER RESTART
B
A
L
O
N
F
A
D
E
R
PGM
AUD
L
R
A
B
S
E
L
E
C
T
E
Q
OFF
CUE LOGIC
A / B LOGIC
STEREO LINE INPUT
CUE
FET SW
LOCAL READY
SEPARATE
FOR A & B
CR
INTRPT
FET SW
AUD
ON SW
L
H
L
H
ON
MIX
MINUS
Monitor
DIP SW
MIC
IN L
HMIC
TRIM
AUD
Monitor
HYBRID
1 IN CALL 1
FADER
MXM
ON SW
HYBRID
2 IN CALL 2
FADER
SUPER
PHONE
OFF
CALL 1
CUE SW
CUE LOGIC
COMPOSITE
OUT
MICS TO
TRK 1
TO HYBRID
1
TO HYBRID
2
CALLERS
TO TRK
3 & 4
TRIM
TRIM
TRIM
TRIM
TRIM
R
L
EXT
IN L
HON
FET SW
PGM
SW
START
STOP
COMMON
LOGIC
REC
READY
SW TRIM
PROGRAM
AUDITION
LT
RT
LT
RT
L
H
LEVEL
L
H
LEVEL
SEND 1
CUE SW
SEND
1
OUT
SEND
2
OUT
SENDS
CUE LOGIC
CR MUTE
∑∑
LT
RT
B
LT
RT
REC READY
CUE LOGIC ENABLE
TIMER RESTART
STUDIO MUTE
CR MUTE W/PGM
CR MUTE
STUDIO MUTE W/PGM
MIX-MINUS
MICS to
PGM
EXT
TRIM
∑
CALL 2
CUE SW
SEND 2
CUE SW
∑
CUE
MUTE
FET SW
CUE MUTE
ENABLE
L
R
L
R
∑
L
H
L
H
L
H
L
HEXT 2
EXT 1
L
R
L
R
TB
SW
∑
STUDIO
TALLY
OPTO
TRIM
TO
CUE
SPKR
L
HJ
LINE IN
PRIVACY
SWITCH
DIPSW
F
E
T
S
W
CUE
FET SW
CUE
FET SW
System Flow Diagram — SP-42 Audio Console Page 1 - 12