Discontinued Products
Digital MPA™
Two Ch. Mic Pre w/ A/D Conversion

The ART MPA Gold and Digital MPA professional Two-Channel microphone preamplifiers use differential input Class-A two-channel tube microphone preamp design with variable input impedance and selectable tube plate voltage to create the most versatile high performance microphone preamplifiers in their class. They deliver unmatched warmth, presence and clarity and in the case of the Digital MPA, the added convenience of direct digital output.

Two 12AX7A Vacuum Tubes
The pure Class-A design using two discrete 12AX7A vacuum tubes to deliver controlled 'musical sounding' overload characteristics for added warmth and presence, while maintaining an incredible dynamic range with unsurpassed sonic detail and clarity.

Variable Input Impedance
Variable Input Impedance is intended to optimize the inputs for the widest possible range of microphone sources. The ability to vary the input impedance of a microphone preamplifier changes the load the microphone 'sees' in the system, dramatically altering its performance and sonic character. This creates a wide range of new sonic possibilities with any modern or vintage condenser, ribbon or dynamic microphone.

The variable impedance control is infinitely variable allowing much finer control and the ability to tune the preamp to the microphone's ideal sweet spot. A continuously variable 15 to 150Hz High Pass Filter at the input increases control of the microphone source.

Selectable Tube Plate Voltage
The selectable Tube Plate Voltage function delivers a wide variety of tone from the Digital MPA or MPA Gold's preamplifier section. The tube circuit is differential, and provides the equivalent of a 300V power supply on the high voltage setting ensuring maximum output with extremely low noise and distortion.

Comprehensive Metering
In addition to the VU meters, the Digital MPA has Tube Warmth LED Metering that measures the left and right audio channel levels. The meters act like a normal histogram for the average signal level and the display holds the highest LED on alone for one second. While the average level function attack and release are measured in milliseconds, the peak function has a 20-microsecond attack time.

Digital Connectivity (Digital MPA)
Take advantage of this world class processing via the analog and digital outputs. AES/EBU, S/PDIF. TOSLINK, and ADAT interfaces allow connection to the broadest range equipment. The Digital MPA provides 24 bit or it can adapt to 16 bit applications with the push of a button. The A/D is front panel adjustable from 44.1 to 96K or syncs to ADAT or external word clock (32KHZ to 100KHz).

Additional Input / Output Capability
Insert jacks between the analog tube section and the digital I/O allow patching of additional analog signal processors such as compressors or EQ's to be introduced to the signal path before digital conversion and output.

Separate balanced analog outputs and multiple digital I/O all offer individual level controls allowing simultaneous use. Additional high-Z 1/4-inch inputs make the MPA Gold and Digital MPA perfect high quality DI in studio or high profile live applications.

  • Variable Input Impedance (150 ohms to 2400 ohms)
  • Selectable plate voltage
  • Large highly visible VU meters
  • Discrete high performance Class-A dual tube input circuitry
  • Low total harmonic distortion
  • Wide frequency response
  • Versatile inputs and outputs
  • Additional Digital Features (Digital MPA Only)
  • 24-204KHz External sample rate
  • 44.1K, 48K, 88.2K, 96K, 176.4K, 192K Internal sample rates
  • 24/16 bit switchable dithering
  • Separate analog and digital output level controls
  • ADAT optical I/O
  • Sync to incoming ADAT
  • Switch selectable optical output (S/PDIF or ADAT)
  • Selectable Pro/consumer output format
  • AES/EBU output
  • Two wordclock jacks allowing loop through

Please click here for a .pdf version of the spec sheet.

Frequency Response Normal Plate 15Hz to 48kHz, High Plate 15Hz to 120
Total Harmonic Distortion > 0.005% (typical)
CMRR > 90dB (typical @ 1kHz)
Controls Input, Impedance, Output level, Digital Level, High Pass Filter, and Sample Rate
Dynamic Range > 100dB, A weighted
Equivalent Input Noise - 134dB (XLR to XLR 'A' weighted)
Input Impedance 150-3K Ω variable (XLR), 800k Ω (1/4")
Analog Connections Balanced XLR (pin 2 hot) inputs and outputs, A/D inserts (TRS) and Unbalanced 1/4" outputs (TS) inputs
Digital Connections AES/EBU (XLR), S/PDIF (RCA), ADAT Optical In, ADAT/TOSLINK Out, Wordclock In, and Word clock Thru (BNC)
Switches +20dB gain, Phase Reversal, Plate Voltage, Meter Source, Phantom Power w/ LED, Dither, Optical Format and Power
Maximum Gain XLR to XLR 75dB
Maximum Input Level +18dBu (XLR), +16dBu (1/4")
Maximum Output Level +28dBu (XLR)
Output Impedance 47 Ω (XLR)
Power Requirements 100 - 125 VAC, 25W Export units configured for country of destination
Vacuum Tube Two hand-selected 12AX7A
Dimensions 6.5" D x 19.0" W x 3.5" H
Weight 12 Lbs
This is beta software, use at your own risk!
Digital MPA™ - Two Ch. Mic Pre w/ A/D Conversion
Digital MPA™ - Two Ch. Mic Pre w/ A/D Conversion