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[Page 1] Ingram Engineering MPA575
INGRAM ENGINEERING MPA575 Microphone Signal Processor Pre-amplifier, Equalizer, Compressor Owner’s Manual July 2014 ...
[Page 2] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 2 ...
[Page 3] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 3 Table of Contents INTRODUCTION……………………………………………………………………………………….. 5 FRONT PANEL FEATURES…………………………………�...
[Page 4] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 4 Table of Figures Figure 1: Front Panel Features………………………………………………………………………. 6 Figure 2: Block Diagram………………………………�...
[Page 5] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 5 INTRODUCTION Welcome, and congratulations on your interest in the MPA575 Microphone Signal Processor! It has been crafted to provide the extremely high quality audio and a simple user interface...
[Page 6] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 6 FRONT PANEL FEATURES Figure 1: Front Panel Features Impedance Presented to Mic Overload LED Light...
[Page 7] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 7 QUICK START GUIDE Optimizing the MPA575 settings involves five easy steps: 1. Disengage the EQ and HPF. 2. Increase the Gain stepped switch until the red O/L LED lights infrequently, th...
[Page 8] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 8 BLOCK DIAGRAM A block diagram of the MPA575 is shown below. Figure 2: Block Diagram ...
[Page 9] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 9 EDGE CONNECTOR PIN ASSIGNMENTS Power, ground and audio signal interface to the MPA575 is through the edge card connector at the rear of the module. Assignments of the edge card connector pins f...
[Page 10] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 10 SAFETY INSTRUCTIONS 1. Read Instructions All the safety and operation instructions should be read before this product is operated. 2. Retain Instructions The safety and operating instruc...
[Page 11] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 11 10. Servicing The user should not attempt to service this product beyond those means described in this operating manual. All other servicing should be referred to the Ingram Engineering Service...
[Page 12] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 12 INSTRUCTIONS FOR USE 1. Installing the MPA575 in a Rack RACK POWER MUST BE OFF BEFORE INSTALLING THE MPA575. The module design is not warrantied for damage that occurs when it is inser...
[Page 13] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 13 4. Adjusting the Audio Input Level After audio connections are made and the audio source is supplying signal, adjust the “Input” knob until the Overload LED (“O/L” on the front panel)...
[Page 14] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 14 5. Overload LEDs The Overload LEDs (O/L) are triggered by fast responding peak detector circuits. The LEDs first begin to illuminate at ~1% THD and remain on for levels above the trigger poin...
[Page 15] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 15 frequencies are emphasized. The EQ is hardwire bypassed when the EQ is switched off using the front panel push button. 9. High Pass (Low Cut) Filter A push button on the front panel engages...
[Page 16] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 16 for maximum level. When the compressor is on, the output level changes because the compressor has automatic make-up gain. Because of this, and because the output pot may be set to any arbitrary...
[Page 17] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 17 Figure 5: MPA575 with Internal Side Chain Filter Figure 6: MPA575 with External Side Chain Filter ...
[Page 18] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 18 12. Adjusting the Output Level Use the “Output” knob to adjust the audio level so that it is compatible with the level specifications of the tape machine, processing gear or A/D connected t...
[Page 19] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 19 increased above 34. Max MPA575 gain in Line Mode is 57dB, and is realized with the stepped switch at fully clockwise position. The following photographs show the location of the slide switch re...
[Page 20] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 20 Figure 8: Line Mode Slide Switch Close-Up 14. Mix Bus Settings Pin 11 of the edge card connector is specified in the VPR 1 Alliance 500 Specification for use as a Gain Trim Resistor. Ho...
[Page 21] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 21 Figure 9: Slide Switch Showing Mix Buss Switch Assignment On Off ...
[Page 22] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 22 The mix bus can be configured as a typical low impedance (~10 Ohms) output for driving high impedance mix buss inputs. The MPA575 is configured in this mode when shipped from the factory. This ...
[Page 23] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 23 AUDIO SPECIFICATIONS (TA=+25°C unless otherwise noted) Parameter Min Typ Max Unit Comments MPA575 Input Impedance Mic Mode Mic Mode Line Mode Line Mode Low Setting 600 ...
[Page 24] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 24 Parameter Min Typ Max Units Comments Total Harmonic Distortion + Noise, Min <10 Hz to 22 kHz BW, 150 Ohm Source, 2.4kHz Input Impedance, 1kHz +10 dBu Output 0.002 ...
[Page 25] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 25 CARE AND MAINTENANCE 1. Cleaning Avoid solvents or chemicals that may dissolve the silkscreen text on the front and back panels. TROUBLESHOOTING 1. Power does not turn on Fir...
[Page 26] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 26 less compression, or change the side chain Equalizer from boost mode to flat response. If an external side chain equalizer is used, check the gain of the external equalizer and check the amount of...
[Page 27] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 27 WARRANTY INFORMATION Ingram Engineering warrants all materials, workmanship and proper operation of this product for a period of three years from the original date of purchase. If any defect...
[Page 28] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 28 To obtain service from an Authorized Ingram Engineering Service Center: Call Ingram Engineering at 678-685-9838, 9 AM to 5 PM Monday through Friday (East Coast Time) to receive: 1) The name an...
[Page 29] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 29 This warranty is extended to the original purchaser and to anyone who may subsequently purchase this product within the applicable warranty period. A copy of the original sales receipt is requir...
[Page 30] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 30 MPA575 MICROPHONE SIGNAL PROCESSOR RECALL SHEET Notes: _____________________________________________________________ _____________________________________________________________ ...
[Page 31] Ingram Engineering MPA575
MPA575 Owner’s Manual 7/2014 31 NOTES: IMPORTANT NOTICE © 2014 Ingram Engineering. All rights reserved. No part of this document may be reproduced...
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