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This symbol, whenever it appears,
alerts you to the presence of uninsulated
dangerous voltage inside the enclosure-voltage
that may be sufficient to constitute a risk of shock.
Read instructions:
Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equip-
ment. Follow the operating instructions printed in this user guide.
Do not open:
There are no user serviceable parts inside. Refer any service work to qualified technical personnel only.
Power sources:
Connect the unit to mains power only of the type described in this user guide or marked on the rear panel. The power
source must provide a good ground connection.
Power cord:
Use the power cord with sealed mains plug appropriate for your local main supply as provided with the equipment. If
the provided plug does not fit into you outlet consult your service agent. Route the power cord so that it is not likely to
be walked on, stretched or pinched by items placed upon or against.
Grounding:
Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the ground
connection on the power cord.
Ventilation:
Do not obstruct the ventilation slots or position the unit where the air required for ventilation is impeded. If the unit is to
be operated in a rack, case or other furniture ensure that it is constructed to allow adequate ventilation.
Moisture:
To reduce the risk of fire or electrical shock do not expose the unit to rain, moisture or use in damp or wet conditions.
Do not place container of liquid on it, which may spill into any openings.
Heat:
Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard. Locate the
unit away from any equipment, which produces heat such as: power supplies, power amplifiers and heaters.
Environment:
Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink spillage
and smoke, especially that associated with smoke machines.
Handling:
To prevent damage to the controls and cosmetics avoid rough handling and excessive vibration. Protect the controls
from damage during transit. Use adequate padding if you need to ship the unit. To avoid injury to yourself or damage
to the equipment take care when lifting, moving or carrying the unit.
Servicing:
Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, spilled liquid, objects
fallen into opening, the power cord or plug becomes damaged during a lightning storm or if smoke odor or noise is
noted. Refer servicing to qualified technical personnel only.
Installation:
Install the unit in accordance with the instruction printed in this user guide.
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST
This symbol, wherever it appears, alerts
you to important operating and maintenance
instructions in the accompanying literature.
Read manual.
1

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Summary of Contents for Art DMPA

  • Page 1 IMPORTANT SAFETY INSTRUCTIONS – READ FIRST This symbol, whenever it appears, This symbol, wherever it appears, alerts alerts you to the presence of uninsulated you to important operating and maintenance dangerous voltage inside the enclosure-voltage instructions in the accompanying literature. that may be sufficient to constitute a risk of shock.
  • Page 2: Table Of Contents

    TABLE OF CONTENTS Introduction ....................3 Introduction ..................... 3 Features ....................3 Front Panel Controls ................. 4 Input Gain Control .................. 4 Input Impedance Control ..............4-5 Analog Output Control................5 HPF Control ................... 5 Gain Switch .................... 5 Phantom Switch ..................5 Phase Switch ..................
  • Page 3: Introduction

    Building upon the quality and success of great sounding products like the Pro MPA, ART engineers set out to develop the next generation of professional microphone preamplifier. The Digital MPA is the culmination of years of research and development, and sets a new standard for quality and value.
  • Page 4: Front Panel Controls

    Running most of the gain on the input generally provides the best performance of the DMPA. Refer to the section titled “Obtaining the best noise performance with the DMPA” for more detailed instructions on setting the Input Gain control for the best results. Input Impedance Control This knob controls the Mic/line input amplifier impedance.
  • Page 5: Analog Output Control

    The Gain switch is used in conjunction with the input gain control to adjust signal levels through the DMPA. When depressed, the tube circuit provides 20dB more gain in the signal path. This also has the effect of driving the tube harder and making the tube the dominant source of gain and overload character.
  • Page 6: Meter Switch

    Dither Switch The DMPA possesses a 24-bit A/D converter. When the output of the unit goes off to a system that can handle only 16 bit data, the 8 least significant bits of data are ignored (truncated). This leaves the sound with gritty “digital”...
  • Page 7: Sample Rate Control

    Sample Rate Control The Sample rate knob determines both the output sample rate of the DMPA as well as the digital data format. You can select either AES/EBU (pro) format or S/PDIF (consumer) data format. This allows the DMPA to interface to a wide variety of digital inputs.
  • Page 8: Optical Switch

    Balanced Inputs The DMPA’s XLR connectors follow the AES standard of Pin 1 = Ground, Pin 2 = Hot (+), Pin 3 = Cold (-). The Balanced inputs have an input impedance that is variable from 150 to 3K Ohms via the front panel control.
  • Page 9: Insert Jacks

    DMPA saving cabling complexity. ADAT Input The ADAT input for the DMPA is a standard optical connector. This input is used when synching to ADAT for timing purposes. It is also used as a data source for channels 3-8, as the channels NOT transmitted by the DMPA are passed from this input to the optical output (when the optical output is set to ADAT mode).
  • Page 10: Signal Path Flow

    SIGNAL PATH FLOW DIAGRAM The signal path of the DMPA consists of a discrete class A microphone pre-amp followed by a Hi Pass Filter, a balanced differential tube circuit with a 20dB Gain switch and then the phase switch. At this point the signal passes to both the analog output and the Insert jacks. The insert jacks allow processing of the signal before its’...
  • Page 11: Obtaining The Perfect Digital Level Setting

    DMPA front panel. Setting the Tube Plate Voltage The DMPA allows the user select between one of two vastly different tube bias and power supply levels. The transition between either setting is smooth and quiet and the gain variation is minimal.
  • Page 12: Warranty Information

    WARRANTY INFORMATION Limited Warranty Applied Research and Technology will provide warranty and service for this unit in accordance with the following warrants: Applied Research and Technology (A R T) warrants to the original purchaser that this product and the components thereof will be free from defects in workmanship and materials for a period of five years from the date of purchase.
  • Page 13: Service

    SERVICE The following information is provided in the unlikely event that your unit requires service. 1) Be sure that the unit is the cause of the problem. Check to make sure the unit has power supplied, all cables are connected correctly, and the cables themselves are in working condition. 2) If you find the unit to be at fault, write down a complete description of the problem, including how and when the problem occurs.
  • Page 14: Specifications

    @196KHz sample rate ......... 10Hz to 81KHz (+0, -1dB) A/D Dynamic Range ..........>115dB “A” weighted (typ.) A/D THD ............... <0.001% @1K (typ.) A/D Input Sensitivity..........+12dBu min A/D Insert Input Impedance…………………………>10K Ohms The ART Digital MPA™ is ADAT licensed.

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