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Presonus Presonus DigiMax D8 Microphone Preamp


The Presonus DigiMax D8 is an 8 channel preamplifier featuring 8 award-winning class A XMAX microphone preamps with 24-bit ADAT digital output. All eight preamps include variable trim control, 48V phantom power

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SKU: PRESONUS DIGIMAX D8 Category: Tags: ,


The Presonus DigiMax D8 is an 8 channel preamplifier featuring 8 award-winning class A XMAX microphone preamps with 24-bit ADAT digital output. All eight preamps include variable trim control, 48V phantom power, ultra-fast acting LED metering and 20 dB pad. In addition, 2 instrument inputs are located on the front panel for direct Hi-Z instrument input. Balanced TRS direct analog outputs are located on the back of the unit for routing and flexibility. The Presonus DigiMax D8 also has word clock sync input for ultra-low jitter and robust synchronization.

The Presonus DigiMax D8 is the perfect solution to add eight professional microphone preamplifiers to any digital recording system with ADAT optical lightpipe expansion capability including Digidesign’s HD and 003 systems, RME, YAMAHA, Alesis, Mackie, and many others.

8 XMAX Class A Preamplifiers The Presonus DigiMax D8 has eight custom-designed high-voltage, discrete, XMAX Class A microphone preamplifiers for all types of microphones. The job of a microphone preamplifier is to boost microphone level signals to line level so that the signal can be converted from analog to digital. This microphone to line boost is generally a preamplification of over 400 times the voltage of the original microphone level signal. This preamplification stage is one of the most important stages that the signal will go through before converted to digital, and is why a high performance preamplifier is important to achieving great results.

All XMAX preamplifiers are built with the same three elements:

High Voltage – The XMAX preamplifier runs on power rails of 30V. Most off the shelf op amp based designs run on power rails of 10V to 18V. Higher voltage power rails deliver more headroom, deeper lows, smoother highs and an overall fuller sound.

Discrete – No op amps. Only transistors, resistors and capacitors. Op amps add noise, coloration and harshness to a signal. Discrete designs deliver ultra low noise and transparency.

Class A – When a circuit is running in Class A mode the circuit is always in an “on” state operating at its optimal voltage requirements. Class A mode has zero crossover distortion and delivers purer, clearer and more musical sonics than class A/B designs which are found in most op-amp circuits.

The net result of the XMAX preamp design is high headroom, low noise, wide dynamic range and wide frequency range, and most importantly, musicality and transparency – smooth highs, solid deep lows, and everything in between.

  • 8 dual-purpose front-panel channel inputs, each with high-headroom Class A XMAX microphone preamplifiers
    • 8 mic/line inputs
    • 2 instrument inputs (front panel; Ch. 1 and 2, bypasses microphone input)
    • Individual channel-trim controls with -4 dB to +50 dB gain range
    • 48V phantom power for condenser microphones (switchable in pairs)
    • -20 dB pad on every channel
    • Analog direct outputs
    • 4-segment, fast-acting LED input meter
  • 8 channels of ADAT optical output at 44.1 or 48 kHz
  • Clock source (sets clock to external or internal with 44.1 or 48 kHz sample rate)
  • Input/Output
    • 2 unbalanced 1/4″ instrument inputs (front panel; bypass Ch. 1 and 2 microphone inputs)
    • 8 balanced combo mic/line inputs
    • 1 BNC word-clock input
    • 8 balanced 1/4″ direct outputs (1 per channel)
    • 1 ADAT Lightpipe optical digital output
  • Digitalia
    • Professional-quality AD converters (+107 dBu dynamic range)
    • ADAT Lightpipe digital output: 24-bit resolution/44.1 and 48 kHz internal sampling rate
    • Word-clock master via ADAT Lightpipe or slave to external word clock
  • Physical
    • 1U 19″ rack-mountable, super durable steel chassis
    • Internal power supply with standard IEC connector
Microphone Preamplifier
Type XLR Female Balanced
Frequency Response (+/-0.5 dB) 20 Hz to 50 kHz
Frequency Response (+/-3.0 dB) 20 Hz to 150 kHz
Input Impedance (Balanced) 1600 Ohms
THD+N (unwtd, 1 kHz @ +4 dBu Output, Unity Gain) < 0.003%
EIN (unwtd, 55dB Gain, 150 Ohms Input, 20Hz to 22 kHz) -126 dBu
S/N Ratio (Unity Gain, unwtd, Ref. = +4 dBu, 20Hz to 22 kHz) > 101 dB
Common Mode Rejection Ratio (1 kHz, 55 dB Gain) > 55 dB
Gain Control Range (+/- 1dB) -4 dB to 50 dB
Maximum Input Level (Unity Gain, 1 kHz @ 0.5% THD+N) +14 dBu
Signal Level LEDs
Red / Clip (+/-0.5 dBu)
Yellow (+/-0.5 dBu)
Green (+/-0.5 dBu)
Green (+/-0.5 dBu)
+10 dBu (0 dBFS)
+4 dBu (-6 dBFS)
-8 dBu (-18 dBFS)
-14 dBu (-24 dBFS)
Phantom Power (+/-2 VDC) +48 VDC
Instrument Input (channels 1 and 2 only)
Type 1/4″ TRS Female Unbalanced
Input Impedance 1 MOhms
Line Outputs
Type 1/4″ TRS Balanced
Output Impedance 51 Ohms
Digital Audio
ADC Dynamic Range (Awtd, 48 kHz Sample Rate) 107dB
Bit Depth 24
Reference Level for 0dBFS +10 dBu
Internal Sample Frequency Selections (kHz) 44.1, 48
External Sample Frequency Input 75 Ohms BNC
Input Connector Type IEC
Input Voltage (factory configured) 90 to 230 VAC
Power Requirements (Continuous) 20W
Weight 6 lbs. (2.72 KG)
Main Chassis
Package Type 1U – steel chassis
Dimensions 19(W) X 1.75(H) X 7(D) inches
Weight 6.0lbs



Additional information

Weight 6 lbs
Dimensions 7 x 19 x 1.75 in