Heritage Audio DMA73

Heritage Audio DMA73 is a 2-channel Class A microphone preamplifier with up to 80 dB of gain, a built-in 20 dB pad, with analog inputs 2 x 1/4" (DI), 2 x XLR (mic), 2 x XLR (line), analog outputs 2 x XLR, frequency response 20 Hz-20 kHz, external power supply (included).

The two-channel microphone preamplifier has a sound and circuit design that is practically identical to the legendary Neve 1073. It is perfect for working with older ribbon microphones. Its microphone preamp with 80 dB of gain accurately recreates the vintage sound. The line mode with 50 dB of gain allows you to re-amp previously recorded tracks.

DMA73 Features

• Two Class A Microphone Preamps
• Two Class A Line Preamps
• Carnhill Input and Output Transformers
• +48V Phantom Power
• 20 dB Microphone Attenuation Pad
• 18 dB per Octave 80 Hz High-Pass Filter
• 3 Gain Stage Modular Card Construction
• Marconi-Style Knobs and Engraved Button
• External Linear Power Supply Reduces EMF
• 1RU Module Fits 19" Rack

DMA73 Specs

• Microphone input impedance: High=1200 Ω minimum; Low= 300 Ω minimum. Higher gain positions gradually have greater impedances, optimum for low gain ribbon mics. Input is transformer balanced and floating
• Line input impedance: 10 kΩ bridging, transformer balanced and floating
• Output impedance: Less than 75 Ω, Carnhill transformer balanced and floating, to drive a load of 600 Ω (Factory terminated)
• D.I. input impedance: Greater than 2 MΩ, unbalanced
• Maximum output: Greater than +26 dBu into 600 Ω (internally terminated)
• THD: Less than 0,025 % at 1 kHz, Less than 0,05 % at 100 Hz
• Frequency response: 20 Hz (+0,3 dB) to 20 kHz (-0,2 dB)
• Maximum Gain: Slightly greater than 80 dB
• Output stage noise: Less than -100 dBu
• Power consumption: 88 mA per rail @ ± 16 V DC
• (External linear PSU to avoid electromagnetic radiation into the audio transformers (a.k.a. hum)
• Dimensions DMA 73 (W x H x L): 482 mm x 44 mm (1 Rack unit) x 184 mm; Weight: 3,4 Kg
• Dimensions External PSU (W x H x L): 200 mm x 44 mm (1 Rack unit) x 160 mm; Weight: 1,9 Kg.