M-TI MPA82000 User manual

MPA82000
User Manual
Compact 8 Channel Professional Audio Amplifier with Integrated DSP Control
Version 1.1, September 2005

MPA82000 Power Amplifier
Declaration of Conformity
The following apparatus is manufactured in Denmark by MTI Danmark A/S of Smedeholm 15-17, DK-
2730 Herlev, Denmark, and conforms to the protection requirements of the European Electromagnetic
Compatibility Standards and Directives relevant to Professional Electrical Equipment. The apparatus is
designed and constructed such that electromagnetic disturbances generated do not exceed levels
allowing radio and telecommunications equipment and other apparatus to operate as intended, and,
the apparatus has an adequate level of intrinsic immunity to electromagnetic disturbance to enable
operation as specified and intended.
Details of the Apparatus: MTI Danmark A/S 8 Channel PA-Amplifier
Model Number: MTI MPA82000
Associated Technical File: Not applicable
Directives this equipment complies with:
73/23/EWG
93/68/EWG
CENELEC 1996-07-02
Harmonised Standard applied:
IEC 61000-3-4
In order to verify compliance with directives:
EN 55103-1 Emission, Issue June 1997
EN 55103-2 Immunity, Issue June 1997
Signed: ___________________ (Klit Lubich)
Date: 01/09/2005
For MTI Danmark A/S
Important notice
Please read the following carefully:
This equipment is for use on lines with more than 16 Amps per phase.
This equipment is intended for use on sites that have their own dedicated distribution.
This equipment is regarded as “professional”. The user is required to ask the supply authority
for permission before connecting to mains supply.
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MPA82000 Power Amplifier
Contents
Declaration of Conformity ........................................................................................................ 2
Welcome ................................................................................................................................ 4
The MPA82000 Amplifier ..........................................................................................................4
Unpacking .............................................................................................................................. 4
Cables and Connections ........................................................................................................... 6
Software Installation................................................................................................................ 8
Using the Speaker Management Software.................................................................................. 8
Specifications........................................................................................................................ 11
Accessories........................................................................................................................... 11
Routine Maintenance .............................................................................................................11
Replacement of an amplifier module ....................................................................................... 12
MTI Limited Warranty............................................................................................................12
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MPA82000 Power Amplifier
Welcome
Thank-you for purchasing an MPA82000 Amplifier from MTI.
MTI is a Danish company with more than 30 years experience of designing and manufacturing for the
professional audio industry. The MPA82000 is one of many high-quality, state-of-the-art professional
audio products manufactured by MTI.
With a continuing quest for innovative technology and manufacturing techniques, MTI is committed to
producing products of the highest standards, superior performance and reliability.
The MPA82000 Amplifier
The MTI MPA82000 is a compact 19” high power amplifier housing:
• Up to 8 x 500W or 1000W modules in any configuration *
• Built in 8-channel DSP controller with full 8 x 8 signal routing matrix, EQ, Crossover, Delay,
Gain and Limiter functions
• Global delay up to 1.6 seconds
• 16 user programmable present programmes
• RS485 interface for controlling up to 16 amplifiers by one PC (up to 1200m/4000ft)
• Balanced line input XLR connector panel
• Neutrik Speakon Speaker connector panel
• Only 3U high in an industry standard 19” width
• 26 Kg (58lbs).
*Standard configuration is 4 x 500 Watt and 4 x 1000 Watt modules. 1000 watt modules are bandwidth limited @ 3kHz -3dB.
Other configurations on request. Module 1 is to the left when the amp is viewed from the front.
The design of this amplifier is a culmination of over three decades of professional audio product
development by MTI. It features a very sophisticated construction, resulting in considerable advances
over traditional amplifier design. All circuit designs are based on extremely reliable and sophisticated
technology, insuring stability into "difficult" loads.
A single MPA82000 at just 3U high can typically replace a 12-16 unit amplifier rack. A built-in 8-
channel DSP controller provides a full 8x8 signal routing matrix, EQ, crossover, delay, limiter and gain
control, with global delay of up to 1.6 seconds. Settings can be stored in 16 user presets. The
MPA82000 can be remotely controlled via an RS485 interface with up to 16 MPA82000s running from
a single RS485 interface over a maximum distance of 1200m (4000ft).
Unpacking
All MTI products are fully tested and inspected before leaving the factory. After unpacking your
amplifier please inspect it for any physical damage. In the unlikely event of damage caused in transit
please contact your MTI dealer immediately so that a written claim for damages can be made. Please
retain the shipping carton and all packing materials in case the unit needs to be returned.
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MPA82000 Power Amplifier
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MPA82000 Power Amplifier
Cables and Connections
The MTI MPA82000 uses industry standard 3-pole XLR sockets for the signal inputs and 4-pole
Neutrik Speakon™ Connectors for the speaker outputs.
There are many manufacturers of XLR connectors in the world and whilst they will generally work with
each other the reliability of cheaper connectors from less well-known manufacturers is questionable.
Therefore MTI recommends that good quality XLR connectors should be used with this product. There
are some connectors that may mate with the Speakon™ sockets but MTI recommends the use of
genuine Neutrik Speakon™ connectors with this product.
When choosing signal cables and speaker cables for your system always select a professional grade
of cable with an overall round sheath that will be hardwearing and easy to handle. Cables should
always be coiled freely and not coiled over the hand and elbow which forces the conductors to twist
within the outer sheath making the cable difficult to handle.
Signal cables should consist of two inner conductors with a single overall shield. The use of balanced
signal wiring is recommended whenever possible for maximum noise immunity.
Speaker cables should be made with a minimum of 2.5mm² csa (12 gauge) cable. However for cable
runs over 50m a minimum of 4mm² (10 gauge) cable should used.
XLR-3 Pin Assignment (Inputs)
Pin 1 Signal ground (shield)
Pin 2 Signal + (hot)
Pin 3 Signal – (cold)
Speakon Pin Assignment (Speaker Outputs)
Speakon 1A 1B 2A 2B 3A 3B 4A 4B
1+ Ch 1+ Ch 2+ Ch 3+ Ch 4+ Ch 5+ Ch 6+ Ch 7+ Ch 8+
1- Ch 1- Ch 2- Ch 3- Ch 4- Ch 5- Ch 6- Ch 7- Ch 8-
2+ Ch 2+ nc Ch 4+ nc Ch 6+ nc Ch 8+ nc
2- Ch 2- nc Ch 4- nc Ch 6- nc Ch 8- nc
Standard configuration of MPA82000 is four 2-way active outputs. Modules 1,3, 5 and 7 are all low
frequency modules, 1000W/4Ohm bandwidth limited to 3kHz (-3dB). Channels 2,4,6 and 8 are full
range modules, 500W/4Ohm. Output Speakons are configured so that pins 1+ and 1- are connected
to the amplifier module for that channel and pins 2+ and 2- are connected to the amplifier module to
the next channel on the right. This allows quick and simple wiring to two-way speaker cabinets using
4-core Speakon cables.
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MPA82000 Power Amplifier
Mutipole Pin Assignment (Outputs)
pin 1+ 9 output module 1 Speakon 1A pin 1+ and 1-
pin 2+10 output module 2 Speakon 1A pin 2+ and 2-, Speakon 1B pin 1+ and 1-
pin 3+11 output module 3 Speakon 2A pin 1+ and 1-
pin 4+12 output module 4 Speakon 2A pin 2+ and 2-, Speakon 2B pin 1+ and 1-
pin 5+13 output module 5 Speakon 3A pin 1+ and 1-
pin 6+14 output module 6 Speakon 3A pin 2+ and 2-, Speakon 3B pin 1+ and 1-
pin 7+15 output module 7 Speakon 4A pin 1+ and 1-
pin 8+16 output module 8 Speakon 4A pin 2+ and 2-, Speakon 4B pin 1+ and 1-
Please note that module number corresponds to processing channel number in the DSP GUI
! DO NOT short speaker outputs ! ! DO NOT ground speaker outputs !
Communication adapters
Neutrik Minicon Pin Assignment (Communication adapter)
Pin 1 TX +
Pin 2 No Connection
Pin 3 No Connection
Pin 4 TX -
Pin 5 No Connection
Pin 6 RX -
Pin 7 No Connection
Pin 8 RX +
Female pinout numbers CW as seen from the front of amplifier
Male pinout numbers CCW as seen from the front of amplifier
Female dongle for preset switching has pin10 and pin12 connected
Roline Pin Assignment
Pin 1 TX +
Pin 2 TX -
Pin 3 RX -
Pin 4 RX +
Switch Settings for Roline adapter
Switch 1 DCE
Switch 2 T.ON/R.ON
USB COMi Pin Assignment
Pin 1 TX +
Pin 2 TX -
Pin 3 RX -
Pin 4 RX +
Pin 5 GND
Jumper Settings
1-2 Connected
9-10 Connected
13-14 Connected
19-20 Connected (All other jumpers are not connected)
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MPA82000 Power Amplifier
Software Installation
Minimum System Requirements:
Intel Pentium or equivalent processor
Microsoft Windows XP, 2000, NT 4.0 (w/Service Pack 5 or later), 98, 98SE or Me
64 MB RAM
20 MB hard drive space
SVGA (800x600) or higher resolution display card and monitor
1 free USB port or 1 free COM port or 1 free RS485 port
Keyboard
Mouse or other pointing device
Please visit www.mtidanmark.dk to ensure that you have the most up to date version of the
MPA82000 speaker management software.
The MPA82000 speaker management software consists of a single application (.exe) file. Simply copy
this file to the hard drive on your computer. If the program is used frequently it is recommended that it
is placed in the Windows Desktop for quick access. Please see your Windows documentation for
further information.
Using the Speaker Management Software
To start the MPA82000 speaker Management Software click on the MPA82000 logo.
Select COM
Whenever you launch MPA82000 speaker
management software you will be asked to Select
COM. Simply highlight the COM port that your
amplifier(s) are
connected to and
press SELECT. If you
wish to explore the
software without an
amplifier connected
then select DEMO.
The Main Screen consists of four control buttons in
the top left corner:
Detect: Searches COM port for any connected
MPA82000 amplifiers
Update: Uploads on-screen settings to MPA82000
memory
Load: Recalls previously saved preset information
from hard drive or floppy drive
Save: Saves on-screen preset information to PC
Beneath the control buttons is a connection tree
showing all devices that are connected and have
been successfully detected by the software. Double
click on a Unit to create a preset. The default preset
name (e.g. Preset 0) then appears beneath the unit.
To edit the preset name first right click then left-click
the name and enter a new name.
To the right of the screen is the function control panel
showing the programmed settings for Matrix,
Equaliser, Crossover, Delay, Volume and Limiter.
Clicking on the tabs at the top accesses each
individual screen.
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MPA82000 Power Amplifier
Matrix
The connection matrix selects the routing through the
amplifier. All inputs are shown in a horizontal line
across the top of the matrix and all outputs in a
vertical line down the right hand side of the matrix.
Any input can be connected to any combination of
outputs simply by placing a tick at the appropriate
junction in the matrix. The default setting is for Input
1 to connect to Output 1, Input 2 to Output 2, etc, but
in some situations it may be required that a
single input feeds all the outputs. If two inputs need
to be summed (e.g. to add left and right channels
together from a stereo source to make a mono
output), then multiple inputs can be selected for the
same output channel.
The default names for inputs and outputs can be
modified simply by double-clicking on any name and
entering a new name in the edit box.
Equaliser
The Equaliser page provides up to six bands of
parametric EQ for each amplifier channel. EQ
parameters of gain, frequency and filter Q can be
adjusted by manually entering figures or using the
up/down buttons by each value.
When the mouse is moved over the EQ screen a
cursor provides precise information regarding the
frequency and gain. An “add crossover” button to the
right of the screen will overlay crossover points onto
the frequency curve. A click and drag function is
provided so simply double-clicking on the equaliser
curve creates blue index points which can then be
dragged by the mouse allowing the EQ curve to be
adjusted visually.
Crossover
The crossover page provides both a low pass filter
and a high pass filter for each channel. None, one or
both filter functions can be used for each channel.
Because of the importance of crossover points in
maintaining system performance and reliability it is
only possible to add or remove a crossover function
by simultaneously holding down CTRL and ALT keys
and clicking the tick box adjacent to LPF Enable or
HPF Enable. A click and drag function is provided so
simply double-clicking on the crossover curve
creates blue index points which can then be dragged
by the mouse allowing the crossover point to be
adjusted visually.
Delay
The delay page offers individual delay settings for
each channel of 0-104ms and a common delay (for
all channels) of 0-1.6s. Delay times are displayed in
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MPA82000 Power Amplifier
seconds, metres and feet, calculated using the
speed of sound at 350 metres per second and 1150
feet per second.
Volume
The volume page controls individual gain for each
channel from –90 to +18dBu. It also features
individual channel mutes and channel polarity
switches.
Limiter
Individual limiters are provided for each amplifier
channel and allow separate control of limiter
threshold, rms window width, attack time, release
time and look ahead time. With such comprehensive
control of the limiter functions it is possible to achieve
excellent performance from the system while still
providing a high level of protection against drive unit
failure. However it is also possible that incorrect
settings will create very audible distortion to the
signal. Therefore some care has to be taken when
adjusting limiter parameters.
In particular fast limiter settings cause significant
degradation of low frequency signals so particular
attention has to be made when setting limiters for
bass or full-range signals.
Peak limiting takes place in the analogue domain.
Limiting is done by highly sophisticated laser trimmed
VCA's without any compression. Each limiter is
adjusted after amplifier configuration to insure
optimum performance. For further guidance please
contact us directly.
Copying settings between channels or between
presets
Right clicking on an individual channel tab allows
settings to be copied to a clipboard that can then be
pasted to another channel within the preset.
Right clicking on the Equaliser, Crossover, Delay,
Volume or Limiter tabs allows settings to be copied
to a clipboard that can then be pasted to another
preset.
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MPA82000 Power Amplifier
Specifications
500W Module 1000W Module
310W / 8Ω670W / 8Ω
Output Power (measured @1kHz) RMS 580W / 4 Ω1300W / 4Ω
Peak Power (measured @1kHz) 1 cycle 900W / 2Ω2000W / 2Ω
Peak output current >45A >50A
Dynamic Range 117dBA 120dBA
THD+N < 0.1%, 0.1W – 500W, 4Ω< 0.09%, 0.1W – 1000W, 4Ω
Efficiency 93% @ 300W / 8Ω93% @ 500W / 8Ω
Output impedance < 5mΩ@ 1kHz < 5mΩ@ 1kHz
Power Supply Rejection Ratio > 60dB > 60dB
Output DC-offset < 25mV < 40mV
Nominal Voltage Gain @ 1kHz +27dB +28dB
Frequency Response +/- 0.5dB 20Hz-20000Hz 20Hz-1000Hz
DF Damping factor ZL = 8, f = 100Hz 2000 2000
Minimum Load Impedance 2 Ω2 Ω
Dimensions H x W x D 133mm (3U) x 483mm (19”) x 535mm
Weight 26kg
Power Requirements 200-250VAC (50-60Hz). 1A standby, 2A quiescent, 32A peak
Accessories
Hardware:
USB to RS485 adapter
COM Port (RS232) to RS485 adapter
Hardware dongle for changing presets
RS485 termination for long cable runs
Data cable for connecting amps
Software: Presets for MTI speaker range
Routine Maintenance
MTI MPA82000 Amplifiers are designed to give long and reliable operation and require very little
maintenance.
SAFETY NOTICE: Please note that power to the amplifier modules is ALWAYS on when the
amplifier is connected to the mains supply. Therefore when carrying out any maintenance the
amplifier must be disconnected from the mains supply.
As with all power amplifiers it is important to ensure that the cooling vents are not blocked and that
adequate airflow is maintained through the amplifier. Periodically check that no obstructions exist
around any of the amplifier ventilation paths. This is particularly important when the amplifier is in a
rack or case.
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MPA82000 Power Amplifier
Dust and debris can accumulate in fan-cooled equipment over time. Therefore it is recommended that
every 2 years the amplifier is disconnected from the mains supply and the lid removed so that dust
can be carefully removed. One method is to use a high-pressure airline to blow dust from the amplifier
chassis. Care should be taken to ensure airflow is not excessive and also the airline should be clean
and dry (i.e. oiled machine tool airlines are not suitable for this operation). Safety goggles must be
worn at all times when using high-pressure air. Alternatively a vacuum cleaner and a soft paintbrush
can be used, with care, to remove built up dust within the unit.
The amplifier case can be cleaned with 3M Stainless Steel Cleaner & Polish or similar products
suitable for delicate electronic equipment. Do not spray cleaning products directly at grilles or
connectors.
Replacement of an amplifier module
Because of the simple modular layout of the MPA82000 it is very straightforward to replace an
amplifier module by following these simple steps:
SAFETY NOTICE: The mains supply MUST be disconnected before removing any part of the
amplifier casing
1. Switch off power and disconnect mains lead from supply
2. Remove 4 x 6mm screws and 4 x 4mm screws from rear panel, noting screw positions
3. Remove rear panel and disconnect power connections to modules
4. To remove a module push it backwards and slide it out
5. Slide replacement module into position
6. Reconnect all power connectors
7. Refit rear panel with 8 screws
8. Reconnect mains supply and test unit for correct operation
MTI Limited Warranty
MTI MPA82000 Amplifiers are warranted to the original end purchaser against manufacturing or
materials defects for a period of one year from the original date of purchase. Faults arising from
misuse, unauthorised modifications or accidents are not covered under this warranty. No other
warranty is expressed or implied.
In the event of malfunction, contact your authorised MTI dealer or distributor for information.
Be aware that warranty details may differ from country to country. Contact your dealer or distributor for
information. These terms do not infringe your statutory rights.
MTI Danmark A/S, Smedeholm 15-17, DK-2730 Herlev, Denmark
www.mtidanmark.com
MTI reserves the right to alter or improve specifications without notice.
© 2005 MTI Danmark A/S All rights reserved
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