LA Audio MPX10 Bedienungsanleitung
MULTI PROCESSOR
OPERATION MANUAL
Page 2
Version - V1 April 2000
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CONTENTS
Page
1. Introduction 3
2. Installation 4
2.1 Inspection and un-packing 4
2.2 Operating environment 4
2.3 CE standards 4
2.4 Power requirements 4
2.5 Signal levels 5
2.6 External connections 6
3. Warranty 9
4. Description of controls 10-15
4.1 Input section 10
4.2 Noise Reduction and Compressor section 11
4.3 Equaliser section 13
4.4 Output section
5. Applications 16-21
5.1 Input 16
5.2 Compressor 16
5.3 Expander 18
5.4 Equaliser 18
5.5 Output 20
6. Circuit description 21
6.1 Inputs 22
6.2 Expander and Compressor 22
6.3 Output 23
7. Specifications 24
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1.0 INTRODUCTION
The MPX10 is a single channel processor designed for one step
processing of vocal or solo instruments where the highest quality signal
path is required. The MPX10 combines a Mic/Line preamplifier with DI
input, Noise Reduction, 4 mode Auto Compressor and Equaliser in a
compact 1U case.
The MPX10 is an ideal front end for direct to tape or hard disk recorders
and as a superior analogue input stage for digital work stations. The MPX10
is equally at home in sound reinforcement applications where it can provide
feedback suppression, vocal levelling and comprehensive tone shaping.
Features include -
•Balanced Line and Microphone inputs (with +48V phantom power)
•High impedance (0.5M) DI input
•High and low pass filtering
•Downward expander Noise Reduction
•Auto Compressor with variable Threshold, Ratio and Gain
•In-built De-ess function
•HF and LF shelving EQ
•2 parametric mid range sections with Gain, Frequency and Q controls
•Output level adjust
•Gain Reduction and Output metering
•Ground compensated outputs at +4dBu and -10dBV
•Input and output break jacks for the Input, Compressor, EQ and output
sections
This last feature allows the user to re-configure the MPX10's signal path
such as putting the EQ before the Compressor. It also means that the
MPX10 can be used as 4 separate signal processors -
•High quality, low noise Mic, Line, DI preamplifier
•Downward expander and auto Attack/Release compressor
•4 band Equaliser
•Variable gain line driver with level metering
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2.0 INSTALLATION
IMPORTANT: PLEASE READ THIS SECTION BEFORE USING THE
MPX10
2.1 INSPECTION AND UNPACKING
The MPX10 has been carefully packed at our factory in a carton designed
to withstand handling in transit. Should the unit appear to have been
damaged in transit notify your dealer immediately and do not discard any of
the packing. The carton should contain -
•The MPX10 unit
•Power cord
•Operator Manual (this book)
2.2 OPERATING ENVIRONMENT
The MPX10 is designed to operate between 0 and 50°C (32-122°F) with
relative humidity no more than 80%. Should the unit be installed in an
equipment rack, ensure that the ambient temperature conforms to these
levels.
2.3 CE STANDARDS AND THE LOW VOLTAGE DIRECTIVE (LVD)
The MPX10 has been designed to meet the latest Electromagnetic
Compatibility (EMC) regulations. However we recommend you do not
operate the unit close to strong emitters of electromagnetic radiation such
as power transformers, motors, mobile telephones or radio transmitters.
The unit should only be connected to a power supply of the type described
in 2.4 POWER REQUIREMENTS or as marked on the unit. The unit must
be earthed for safe operation. Disconnect the mains supply before
removing any cover.
2.4 POWER REQUIREMENTS
There is a mains fuse located inside the unit which is accessed by
removing the cover. This fuse is for protection against unit faults and as
such will not normally need replacing. If you think you have a power related
problem please refer to your dealer.
The voltage and fuse rating have been factory set for -
230V 50mA UK and Europe
220V 100mA Republic of Korea
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110V 100mA North America
•The correct voltage and fuse rating is indicated on the
rear panel.
•Please check that your unit is correctly rated for the
voltage of the country of operation.
If the fuse requires changing at any time please ensure the correct fuse is
fitted. An incorrect fuse could cause damage to the unit and may constitute
a fire hazard.
If you carry your MPX10 from one country to another it is very important to
ensure the voltage is compatible.
For your information the unit can be internally rewired for use in 230V, or
110-125V countries - contact your dealer for information. A special 100V
version is available for Japan and a 220V version for Republic of Korea.
The mains lead connections to the appliance are coloured in accordance
with the following code:
Green-and-Yellow Earth
Blue Neutral
Brown Live
•WARNING: THIS APPLIANCE MUST BE EARTHED
2.5 SIGNAL LEVELS
For input level ranges see GAIN control in the Description of Controls
section.
The MPX10 outputs both -10dBV and +4dBu operating levels without the
need for level switching.
++ IMPORTANT NOTE: the XLRs are set for +4dBu and the TRS jacks
for -10dBV operating levels. Use the appropriate connector/level to
interface between your equipment and the MPX10.
The OUTPUT control on the MPX10 allows -20dB to +20dB of level
adjustment which should allow the MPX10 to interface to most equipment
types.
Signals in excess of +20dB will cause the unit to distort.
2.6 EXTERNAL CONNECTIONS
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INPUT SECTION:
MICROPHONE XLR Pin 1 Screen (Signal
ground) Pin 2 Hot (+ve)
Pin 3 Cold (-ve)
This is a low impedance (1.2k), low level input designed to give the
correct loading and sensitivity for dynamic type microphones. Plugging line
sources into this input may load the connected equipment and may result
in the loss of signal level, frequency range and increased distortion.
Pin 1 = ScreenPin 2 = Hot (+)
Pin 3 = Cold (-)
PUSH
Microphone Input XLR connections (view of connector on MLX2)
LINE TRS Tip Hot (signal +)
Ring Cold (signal -)
SleeveScreen (signal ground)
Sleeve
Screen Ring
Cold(-) Tip
Hot(+)
Fig 2.6.3: Line Input and -10dBV Output connections
The 20k input impedance of the LINE input is suitable for most types of
equipment.
For un-balanced operation join Ring and Sleeve on your connecting cable.
Plugging a mono jack lead into the LINE input will effectively un-balance the
signal connection.
DI jack Tip Hot (signal +)
SleeveScreen (signal ground)
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Sleeve
Screen Tip
Hot(+)
Fig 2.6.4: DI Input connections
This a high impedance (0.5M) input primarily intended for connecting
directly to electric guitars.
OUTPUT jack Tip Hot (signal +)
SleeveScreen (signal ground)
This connector provides an unbalanced line level output from the
Mic/Line/DI preamplifier. Plugging a jack into this connector does not effect
the signal path through the MPX10. Source impedance is 100 which is
suitable for driving loads of 1k and greater.
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COMPRESSOR SECTION
INPUT jack Tip Hot (signal +)
SleeveScreen (signal ground)
This is the input to the Compressor section and is normally connected to
the 'output' of the Mic/Line/DI preamplifier. Plugging a jack into this
connector breaks the signal path and the Tip of the inserted jack becomes
the input to the compressor (Half-Normalled). All the 'Input' and 'Output'
connectors between each of the processing sections on the MPX10 work
in this way.
'Input' is unbalanced, however the connector is wired in such a way as to
be compatible with un-balanced (mono) and balanced (stereo/TRS) jacks.
SIDECHAIN jack Tip Return
Ring Send
SleeveScreen (signal ground)
Sleeve
Screen Ring
Send Tip
Return
Plugging into the MPX10's side chain automatically breaks the signal path
to the side chain circuitry. This path must be completed by the external
connected equipment.
The side chain in-out signal path affects both the Compressor and the
Expander response.
Commonly used to insert an equaliser into the sidechain to produce
frequency conscious compression such as de-essing.
Because each section of the MPX10 has Input and Output break jacks it is
possible to plug the EQ of the MPX10 into the Compressor sidechain to
allow more advanced Frequency Conscious Compression.
LINK jack Tip Control voltage
SleeveScreen (Control voltage
ground)
Link provides a means of joining the sidechain detectors of two MPX10s for
stereo operation. To ensure accurate stereo tracking the NR and
Compressor controls on both MPX10s should be set the same. Linking and
setting-up MPX10s in this way also ensures that signals from either MPX10
cause compression.
Please note that the Link output is a DC control voltage
and should not be connected into any audio signal path.
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