LA Audio Electronic MS424 Operating and safety instructions

4 Channel 1:4 Active Mic Splitter
In keeping with our policy of continuous improvement LA Audio reserves the right to alter specifications without prior notice.
Manufactured in the UK by LA Audio, 6-24 Southgate Road, London, N1 3JJ.
Tel: [phone], FAX: [phone]. Web: www.laaudio.co.uk. email: [email protected].uk
An SCV International Group Company
PRODUCT OVERVIEW
The MS424 is a 4 channel 1 into 4 Unity Gain Active Microphone Splitter in a compact 1U self powered case.
The MS424 is designed for applications where multiple feeds are required from one set of microphones without
the signal degradation experienced with most passive splitting solutions. The Unity Gain design philosophy
allows simple integration into existing systems without the need for lengthy recalibration.
Each of the MS424 channels has an electronically balanced input, which may be transformer balanced as an
option, and four independently transformer buffered floating outputs on XLR connectors. Output one of each
channel may be linked directly to the input via a rear panel switch. The unit may also be configured, by way of
internal links, to feed 8, 12 or 16 outputs from any one input, allowing the MS424 to be used for press box
applications.
The front panel of the MS424 gives access to outputs 3 and 4 as well as phantom power switching with
phantom presence LED, and Pad switching for line level signals. The inputs and outputs 1&2 are grouped on
the rear panel together with the output 1 Link switches.
The MS424's internal power supply makes it ideally suited to smaller installations where it becomes highly cost
effective when compared to externally powered alternatives.
British
Originals
SPECIFICATIONS
ELECTRICAL
Frequency response:
Equivalent Input Noise:
THD:
Gain:
Input Impedance:
Maximum Input Level:
Output Impedance:
Load Impedance:
20Hz to 20kHz (+0, -0.5dB)
> -121dBu
< 0.01 % (1kHz, 150R load)
0dB (-20dB with Pad)
2k
0dBu (+20dBu with Pad)
< 50R
>150R
PHYSICAL
Input Connector:
Output Connectors:
Power Connection:
Dimensions:
Weight:
Shipping Weight:
Temperature Range:
Power Requirement:
XLR 3 Pin (Pin 2 hot)
XLR 3 Pin (Pin 2 hot)
Detachable lead.
IEC 3 pin socket
483mm (19") W
208mm (8.2") D
44mm (1.75") H
4.4kg
5.4kg
Operating: 0∫C to 50∫C
Storage: -30∫C to 75∫C
15VA, 115/230V, 50/60Hz
+48V
Mic
Pad
Input stage Output stage
1
1
2
3
4
Channel
jumpers
LINK
switch
Internal
bus
BLOCK DIAGRAM

4 Channel 1:4 Active Mic Splitter
In keeping with our policy of continuous improvement LA Audio reserves the right to alter specifications without prior notice.
Manufactured in the UK by LA Audio, 6-24 Southgate Road, London, N1 3JJ.
Tel: [phone], FAX: [phone]. Web: www.laaudio.co.uk. email: [email protected].uk
An SCV International Group Company
ARCHITECTS & ENGINEERS SPECIFICATIONS
The Microphone Splitter shall be a 4 channel unit in a 1U case with an internal power supply. Each channel
shall feed 4 separate transformer isolated outputs from one input. The unit shall operate at Unity Gain for ease
of installation.
The inputs shall be electronically balanced with the option to fit input balancing transformers. The outputs shall
be independently buffered and transformer balanced as standard. The unit shall allow internal reconfiguration
to feed 8,12 or 16 outputs from any input. Additionally output one of each channel shall be linkable to the input
by means of a rear panel switch.
Each channel shall provide front panel switching of internal Phantom Power and a Phantom Presence LED
shall indicate externally derived Phantom Power. A 20dB Pad switch shall be provided to allow connection to
line level sources.
Access to inputs and outputs 1 & 2 shall be via rear panel XLR's and outputs 3 & 4 shall be accessed via
XLR's on the front panel.
The unit shall be built in accordance with the directives encompassed within the 'CE' regulations and so
marked.
The Mic Splitter shall be an LA Audio MS424.
British
Originals
165.0
44.0
483.0
4
Output 2 Output 1 Input
Pin 1 - Ground lifted
Link
SERIAL No:
230V ~50Hz
FUSE
T100mA
Manufactured in the UK by SCV Electronics, London. No user serviceable parts inside. Disconnect from mains before removing cover. WARNING: This equipment must be earthed
3
Output 2 Output 1 Input
Pin 1 - Ground lifted
Link
2
Output 2 Output 1 Input
Pin 1 - Ground lifted
Link
1
Output 2 Output 1 Input
Pin 1 - Ground lifted
Link
FUSE
OUTPUT 1
OUTPUT 2
A U DI O
POWER
OUTPUT 4
OUTPUT 3
-20dB
ON
+48V
OFF
PAD
0dB
OUTPUT 4
OUTPUT 3
-20dB
ON
+48V
OFF
PAD
0dB
OUTPUT 4
OUTPUT 3
-20dB
ON
+48V
OFF
PAD
0dB
OUTPUT 4
OUTPUT 3
-20dB
ON
+48V
OFF
PAD
0dB
CHANNEL 1CHANNEL 1 CHANNEL 2CHANNEL 2 CHANNEL 3CHANNEL 3 CHANNEL 4CHANNEL 4
DIMENSIONS