Heritage Audio DMA-73 Dual Microphone Preamplifier

SKU: HADMA73 MFR: DMA73
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Key Features

  • Capture pristine audio with the DMA-73's low noise, ensuring clear recordings.
  • Achieve versatile sound shaping with an impressive microphone preamp gain range.
  • Optimize signal flow with selectable input impedance for various microphones.
  • Connect seamlessly using XLR and 1/4" DI inputs for flexible connectivity.
  • Experience lasting reliability with the robust build quality of Heritage Audio.
  • Elevate studio recordings with the DMA-73, delivering exceptional sound quality.
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Special Order?Estimated to Ship: 08/22/2025
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Heritage Audio DMA-73 Specifications

  • Channels

    2

  • Connectors

    2x 1/4" DI input jacks
    2x balanced 3-Pin female gold-plated XLR microphone inputs
    2x balanced 3-Pin female gold-plated XLR line inputs
    2x balanced 3-Pin male gold-plated XLR outputs

  • Input Impedance

    Microphone
    HI: 1200Ohms minimum
    LO: 300Ohms minimum
    Line: 10 kOhms bridging, Carnhill transformer balanced and floating
    DI: Greater than 2 MOhms

  • Output Impedance

    Less than 75Ohms,
    Transformer balanced and floating to drive a load of 600Ohms

  • Maximum Output

    Greater than +26dBm into 600Ohms

  • THD

    Less than 0.025% at 1000Hz
    Less than 0.05% at 100Hz

  • Frequency Response

    20Hz (+0.3dB) to 20,000Hz (-0.2dB)

  • Maximum Gain

    Slightly greater than 80dB

  • Noise

    Less than -100dBm

  • Power Consumption

    Less than 200 mA at 24 VDC

  • Dimensions (W x D x H)

    19.1 x 12.2 x 1.77" / 485.14 x 309.88 x 44.96mm

  • Weight

    7.3lbs / 3.31kg

  • UPC Code

    639713908268

About Heritage Audio DMA-73

Find the perfect balance of quality and performance with the DMA-73 Dual Microphone Preamplifier. This device is equipped with an 80dB Class A Microphone preamplifier that features HI-LO selectable minimum input impedance, balanced and floating. This high gain position exhibits a higher impedance, making it an ideal choice for vintage ribbon microphones.

The DMA-73 also boasts a 50Db Class A Line preamplifier, which offers bridging input impedance, balanced and floating for superior sound quality. The all-discrete Class A Ultra High Impedance J-Fet Direct Input is located on a high-quality Neutrik Jack. This DI circuit is strategically placed ahead of the Mic Input transformer, ensuring the transformer is on when in DI mode.

Experience the power of the Class A single-ended, 2N3055 driven, high headroom output stage. The DMA-73 features individual Neutrik gold plated XLR connectors for microphone and line inputs, along with a gold plated Neutrik XLR output for enhanced audio transmission.

The device comes with a PAD: 20dB Mic input attenuation ahead of the input transformer to prevent overloading. The active all-discrete Class A 3rd order Bessel, 80Hz Hi Pass Filter, with an 18dB/octave slope, ensures clear and crisp audio.

The DMA-73 Dual Microphone Preamplifier also includes an OUTPUT control to allow overloading of the preamp, and an external linear PSU to avoid electromagnetic radiation into the audio transformers, eliminating unwanted hum.

This preamplifier is built with Carnhill Input and Output transformers and a 3 gain stage, genuine B283 gain card modular construction. The Marconi style knobs and vintage style engraved pushbuttons add a touch of classic elegance to this high-performance device.

In summary, the DMA-73 Dual Microphone Preamplifier is a blend of advanced technology and classic design, offering superior audio quality for both professional and personal use.

Heritage Audio DMA-73 Features

  • Class A 80dB Microphone preamplifier with HI-LO selectable minimum input impedance
  • 50Db Class A Line preamplifier with bridging input impedance for superior sound quality
  • All-discrete Class A Ultra High Impedance J-Fet Direct Input on a high-quality Neutrik Jack
  • High headroom output stage driven by Class A single-ended, 2N3055
  • Individual Neutrik gold plated XLR connectors for enhanced audio transmission
  • Comes with PAD: 20dB Mic input attenuation and 80Hz Hi Pass Filter for clear audio output
  • Designed with Carnhill Input and Output transformers and Marconi style knobs for a classic touch

Product Documents

User Manual

Key Features

  • Capture pristine audio with the DMA-73's low noise, ensuring clear recordings.
  • Achieve versatile sound shaping with an impressive microphone preamp gain range.
  • Optimize signal flow with selectable input impedance for various microphones.
  • Connect seamlessly using XLR and 1/4" DI inputs for flexible connectivity.
  • Experience lasting reliability with the robust build quality of Heritage Audio.
  • Elevate studio recordings with the DMA-73, delivering exceptional sound quality.

What's in the box:

  • Heritage Audio DMA-73 Dual Microphone Preamplifier
  • Heritage Audio 1 Year Parts & Labor Warranty