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SETUP  MODE  SYSTEM  DESCRIPTION AND 
USER INTERFACE

The  MPM4  is  a  powerful,  feature-filled  audio 
router and controller.  Using the available control 
functions, the system installer can make all the 
adjustments necessary to provide a transparent, 
simple audio manager for the system operator.   
Once the system has been properly adjusted, a 
password lockout code can be enabled to protect 
the  setup  from  unauthorized  alterations.   
Parameters that can be adjusted include:

Source Input Level Trim.

   By trimming all of the Source 

Inputs to the same level, the volume in the zones remains 
uniform  when  switching  between  them.  The  Trim  level 
adjustment range is ±20dB in 1dB steps.   Each encoder 
detent equals 1dB.

Source  Input  EQ. 

A  four-band  equalizer  with  a  ±15dB 

range of adjustment is available on each Source Input for 
optimizing  its  sound.  The  Lo  Mid  center  frequency  is 
600Hz and the Hi Mid is 2.5kHz. These are peaking filters. 
The Low and Hi frequency bands are shelving types with 
different characteristics in boost or cut mode. The Low EQ 
boost curve is a shelving type filter with a nominal roll-off 
frequency of 80Hz. The Low EQ cut curve has a 12dB per 
octave  slope  with  a  sliding  roll-off  frequency.  As  the 
amount of cut is increased, the frequency shifts upward. 
Nominal frequency points are 20Hz to 250Hz. The Hi EQ 
boost curve is a shelving type filter with a nominal roll-off 
frequency of 8kHz. The Hi EQ cut curve has a 12dB per 
octave  slope  with  a  sliding  roll-off  frequency.  As  the 
amount of cut is increased, the frequency shifts downward. 
Nominal frequency points are 15kHz to 2.5kHz. The EQ 
Controls  make  changes  in  1dB  increments  that  are 
displayed  on  the  Control  Position  Indicator  LEDs.  Each 
1dB detent in the Control corresponds with a change in the 
display  providing  precise  adjustment  throughout  the 
±15dB range.

Zone Output EQ.

   A four-band equalizer is available on 

each  of  the  mono  Zone  Outputs.   The  range  of  all  four 
bands is ±15dB.  The Lo Mid and Hi Mid are peaking filters 
with frequency centers at 250Hz and 1.6kHz.   The Low 
and Hi are shelving filters with corner frequencies of 20Hz 
and 10kHz.  The Lo Mid frequency control peaks at 250Hz, 
which  enhances  upper  bass  in  ceiling/wall  mount  type 
speakers.  The  Hi  Mid  frequency  control  was  chosen  at 
1.6kHz to enhance voice frequencies.   The EQ Controls 
make changes in 1dB increments that are displayed on the 
Control Position Indicator LEDs.   Each 1dB detent in the 
Control corresponds with a change in the display providing 
precise adjustment throughout the ±15dB range.

Zone Max Level.

  An appropriate maximum volume for the 

listening  environment  can  be  established  by  setting  the 
audio level going to each Zone Output.  This feature allows 
the installer to determine the maximum level of all audio 
inputs into each zone by coordinating the output gain of the 
MPM4 to the inputs of the Zone power amps.   This is an 
analog final output gain stage with 20dB of gain and 60dB 
of  attenuation,  adjustable  in  1dB  steps.  Each  encoder 
detent equals 1dB.   Unity Gain is at the 0 position of the 
Control  Position  Indicator  LED.    Output  gain,  in 
conjunction with the of gain and attenuation in the Input 
Trim  controls  and  the  Priority  Assign  function  allow 
manipulation  of  the  signal  levels  to  achieve  balance 
throughout the system.

Priority Input Level Trim.

   The audio level at the Priority 

Inputs can be adjusted to compensate for varying output 
levels  from  different  types  of  sources.  The  Trim  level 
adjustment range is 0dB to +60dB. Each encoder detent 
equals 1dB.  The available gain is used to increase paging 
mic signals to line level.   Line level inputs will require the 
use of the Input Pad.  This is activated by pushing the rear 
panel switch associated with each Priority Input.

Priority  Input  EQ.

  A  four-band  equalizer  with  a  ±15dB 

range of adjustment is available on each Priority Input for 
optimizing  its  sound.  The  Lo  Mid  center  frequency  is 
600Hz and the Hi Mid is 2.5kHz. These are peaking filters. 
The Low and Hi frequency bands are shelving types with 
different characteristics in boost or cut mode. The Low EQ 
boost curve is a shelving type filter with a nominal roll-off 
frequency of 80Hz. The Low EQ cut curve has a 12dB per 
octave slope with a sliding roll-off frequency. As the amount 
of cut is increased, the frequency shifts upward. Nominal 
frequency  points  are  20Hz  to  250Hz.  The  Hi  EQ  boost 
curve  is  a  shelving  type  filter  with  a  nominal  roll-off 
frequency of 8kHz. The Hi EQ cut curve has a 12dB per 
octave slope with a sliding roll-off frequency. As the amount 
of  cut  is  increased,  the  frequency  shifts  downward. 
Nominal frequency points are 15kHz to 2.5kHz. The EQ 
Controls  make  changes  in  1dB  increments  that  are 
displayed  on  the  Control  Position  Indicator  LEDs.  Each 
1dB detent in the Control corresponds with a change in the 
display  providing  precise  adjustment  throughout  the 
±15dB range.

Priority Assign.

  This feature assigns the Priority Inputs to 

the Zone Outputs, using the Input First method, and sets 
the level of each channel of priority audio within each zone.  
The Routing Matrix is used to make the assignments and 
the rotary controls are used to set the priority level relative 
to the Source Inputs. The adjustment range is ±20dB in 
1dB  steps.    Each  encoder  detent  equals  1dB.    In 
unassigned zones, the Control Position Indicator LED on 
the level controls is set to minimum.   Priority Input 1 and 
Priority Input 2 have an extra switch on the rear panel that 
allows the Priority Input signal to bypass the current setting 
of  the  Zone  Volume  Controls.    With  the  switches  on, 
Priority  Input  1  and  2  audio  is  sent  directly  to  the  Zone 
Outputs  at  the  level  determined  by  the  Zone  Max  Level 
setting  and  all  other  inputs  will  be  ducked  to  –70dB 
regardless of the position of the Ducking Switch.

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Summary of Contents for MPM4

Page 1: ... or a remote control in each zone make source selection and level adjustments easy and convenient Occupying two rack spaces and designed for continuous operation the MPM4 includes all the features necessary to operate most multi zone sound system installations in night clubs sports bars health clubs offices restaurants or anywhere paging and or priority inputs are required FEATURES Simple convenie...

Page 2: ...ttenuators All functions shall be adjusted and controlled through front panel controls and rear panel switches A password lockout feature shall be available to prevent unauthorized alteration of system setup functions The unit shall store all system settings in non volatile EEPROM The unit shall be standard rack mount 19 wide 3 5 2RU high with a depth of 10 behind the rack mounting ears The unit s...

Page 3: ... until mode is exited It is not possible to assign anything in this mode Encoders are input level controls for source inputs 1 4 Meters measure preamp outputs Clip LED monitors source input only Control Range 20dB to 20DB Meter Range 36dB to 12dB PASSWORD ACCESS INPUT TRIM MODE MATRIX AREA ACTIONS ENCODER METER AREA ACTIONS SETUP MPM4 SETUP MODE CONTROL SUMMARY The flashing In or Zone button indic...

Page 4: ... Setup Mode LEDs The Setup Mode LEDs are off in Normal Mode PriorityActive Mode Priority Inputs replace or mix with the Source Inputs in any Zone to which they are assigned When a Priority Input signal is received the corresponding Priority Input LED illuminates The Routing Matrix LEDs in the Zones that have this Priority Input assigned to them flash while the Priority Input is active Any Source I...

Page 5: ...ttons and then activate it by pushing the Mode Select button which will begin flashing The password sequence must then be correctly repeated followed by pushing the Mode Select button to validate it Successful reentry will cause the Routing display to flash twice and the Mode Select button to be fully illuminated An incorrect verification sequence will cause the MPM4 to exit the Password Change mo...

Page 6: ...et connects to the incomingAC line to the Power Supply The MPM4 operates with 100 250VAC and is rated at 25 Watts All settings of the MPM4 are saved in non volatile memory through power cycling The MPM4 powers up with the same settings that it had when power was removed All settings are recorded ten seconds after any control change is made Remote Controls The Remote Control Connections allow optio...

Page 7: ...udio from the Priority Inputs is added to or replaces Source Input audio in any Zone to which the Priority Input is assigned The Priority Inputs assigned within each Zone have a cascading hierarchy with signal input on P3 muting P4 input on P2 mutes P3 and P4 and input on P1 mutes all three The MIC LINE female XLR Input accepts balanced mic or line signals with levels up to 24dB Phantom power is a...

Page 8: ... by coordinating the output gain of the MPM4 to the inputs of the Zone power amps This is an analog final output gain stage with 20dB of gain and 60dB of attenuation adjustable in 1dB steps Each encoder detent equals 1dB Unity Gain is at the 0 position of the Control Position Indicator LED Output gain in conjunction with the of gain and attenuation in the Input Trim controls and the Priority Assig...

Page 9: ...peration of the paging function For this installation a paging mic is plugged into Priority Input 1 All paging microphones used with the MPM4 should have an ON OFF switch Select the Priority Assign mode and clear all Priority Assignments all Routing LEDs off in the desired Zone Assign Priority In 1 to the Zone and set the level control to minimum Connect the paging mic to Priority Input 1 Select t...

Page 10: ...output buffers As with the Audio Inputs the device used for Level Trims is made by Burr Brown The XLR and RCA outputs use separate buffers This allows both outputs to be used simultaneously without concern for loading Digital Signal Processor The Whirlwind MPM4 features anAnalog Devices SHARC processor This processor features very high performance and allows the use of 32 bit floating point repres...

Page 11: ...cted Priority Input is forced on and other priorities are forced off This means that the Priority signal is routed through to the outputs un gated DSPPriority Output Levels and Priority Override Priority Levels may be adjusted in Priority Assign mode to set the level of each channel of priority audio within each zone relative to the Source Inputs When Priority Zone Level Override has been turned o...

Page 12: ... Priority Trim Controls Priority Assign Level Controls Zone Max Level Controls All EQ Band Level Controls AC Voltage Requirement Power Consumption Size Width Height Depth Weight 12 Illuminates 1dB below 0dBfs Less than 01 Less than 01 80Hz boost variable cut 600Hz 2 5kHz 8kHz boost variable cut MPM4 Output EQ 25 20 15 10 5 0 5 10 15 20 25 10 100 1000 10000 100000 MPM4 Input EQ 25 20 15 10 5 0 5 10...

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