DMA 73 - Audio Heritage Audio - Free user manual and instructions
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| Product Type | Dual-channel microphone preamplifier with DI |
| Brand | Heritage Audio |
| Model | DMA 73 |
| Channels | 2 independent mic/line/DI channels |
| Gain Range | 20 dB to 80 dB continuously adjustable |
| Input Impedance (Mic) | 1200 ohms |
| Input Impedance (DI) | 10 MΩ |
| Phantom Power | +48 V selectable per channel |
| High-Pass Filter | 80 Hz, 18 dB/octave per channel |
| Phase Invert | Selectable per channel |
| Output | Balanced XLR line output |
| Output Level | Continuously variable output trim |
| Frequency Response | 20 Hz - 20 kHz ± 0.5 dB |
| Max Output Level | +26 dBu into 600 ohms |
| Equivalent Input Noise | -120 dBu at 60 dB gain |
| Power Supply | Internal linear supply, 100-240 VAC, 50/60 Hz |
| Dimensions (W x H x D) | 483 x 44 x 200 mm (19\" rack, 1U) |
| Weight | 3.2 kg |
| Construction | Steel chassis with aluminum front panel |
| Maintenance & Cleaning | Wipe with a dry, lint-free cloth; avoid solvents |
| Safety | Do not expose to moisture; ensure proper grounding |
| Spare Parts & Repairability | No user-serviceable parts; contact authorized service center |
Frequently Asked Questions - DMA 73 Heritage Audio
What is the Heritage Audio DMA 73?
The DMA 73 is a dual-channel microphone preamplifier with a built-in DI (Direct Injection) box. It is inspired by classic British console preamps and is designed for professional recording, broadcast, and live sound applications.
How do I connect a microphone to the DMA 73?
Connect a microphone to the XLR input on the rear panel. Set the input selector to MIC and adjust the gain control to achieve the desired level. Remember to engage +48V phantom power if you are using a condenser microphone.
Can I use the DMA 73 with instruments?
Yes, the DI input on the front panel accepts a 1/4" instrument cable. The DI has a high impedance that matches guitars and basses, allowing you to connect them directly without the need for an external DI box.
How do I engage +48V phantom power?
Each channel has a dedicated +48V phantom power switch. Press it to supply phantom power to the XLR input. Ensure that the switch is off when connecting or disconnecting microphones to avoid damaging them.
What is the purpose of the high-pass filter?
The high-pass filter (HPF) removes low-frequency rumble and is set at 80 Hz with a slope of 18 dB/octave. It helps clean up muddiness and reduces stage noise without affecting the tonal balance of most sources.
How do I adjust the output level?
Each channel has an output trim control that adjusts the signal level sent to your mixer, interface, or recorder. This is useful for matching the DMA 73 to the input stage of your gear without overdriving it.
Does the DMA 73 support both mic and line inputs?
The inputs are designed for microphone and DI/instrument use. There is no separate line-level XLR input, but line-level sources can be connected to the DI input if the level is properly attenuated.
What are the key specifications of the DMA 73?
The DMA 73 provides 20-80 dB of gain, a frequency response of 20 Hz - 20 kHz ± 0.5 dB, and a maximum output level of +26 dBu. It has very low noise and high headroom, making it ideal for critical recording applications.
How should I clean and maintain the unit?
Use a dry, lint-free cloth to wipe the front panel and chassis. Avoid using solvents or abrasive cleaners. Ensure the unit is unplugged before cleaning. No internal parts require maintenance.
Is the DMA 73 rack-mountable?
Yes, the DMA 73 features a standard 19" rack width and occupies a single 1U rack space. It can be mounted in a studio rack using the included rack ears.
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USER MANUAL DMA 73 Heritage Audio
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Product information
Brand : Heritage Audio
Model : DMA 73
Category : Audio