Presonus DigiMax FS Mic Preamp

8 Channel Mic Preamp with 24 Bit - 96K ADAT I/O

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Eight-channel microphone preamplifier loaded with direct outputs and inserts on every channel.

The Presonus DigiMax FS is an eight-channel microphone preamplifier, with 24-bit/96k ADAT dual SMUX I/O and word clock I/O. Loaded with direct outputs and inserts on every channel, the DIGIMAX FS is the perfect hardware expansion for your FireStudio or any digital recording system with optical light pipe expansion capability including DigiDesign’s HD and 002 systems, RME, YAMAHA, Alesis, Mackie and many others.

The DigiMax FS is loaded with new patented JetPLL jitter reduction technology ensuring ultra-high converter performance, fast and robust locking through a wide range and variation of frequencies and noise shaping to remove nearly all audio band jitter.

8 XMAX Class A Preamplifiers
The DigiMax FS includes 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 mic to line boost is generally a preamplification of over 400 times the voltage of the original mic 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.

Digital Converters and JetPLL Sync
The synchronization of the DigiMax FS is handled by patented JetPLL™ jitter reduction technology. JetPLL™ incorporates noise shaping to virtually remove all audio band jitter. JetPLL™ ensures the highest converter performance possible, resulting in better stereo separation and clearer more transparent audio. JetPLL™ delivers ultra-fast locking to any digital format, through a wide range of frequencies and is extremely robust, and tolerant of wide variations in clock frequencies. JetPLL™ ensures near perfect clock performance when networking audio devices thus creating the most stable and robust synchronization to all devices.

Features:
• 8 class A microphone preamps w/ trim control
• 24-bit resolution, 44.1, 48, 88.2 and 96K sampling rate
• 96k ADAT input and output (dual SMUX)
• JetPLL jitter reduction technology for ultra tight synchronization
• Direct outputs and inserts on every channel
• Word clock input and output
• Hybrid design incorporates noise shaping to virtually remove audio band jitter
• Ensures highest converter performance possible, resulting in better separation
• Fast locking to any digital format, through a wide range of frequencies
• Extremely robust, and tolerant of wide variations in clock frequencies
• Ensures near perfect clock performance when networking audio devices
• Dual VCXO loop performance and quality

Product Specification

Microphone Preamp (XLR Balanced) All measurements Microphone Input to Direct Output
Frequency Response (+0,- 0.5dB)	20Hz to 40KHz
Frequency Response (+0/-3.0 dB)	20Hz to 100KHz
Input Impedance	1600 Ohm
THD+N (unwtd, 1KHz @ +4dBu Output, Unity Gain)	<0.003%
EIN (unwtd, 55dB Gain, 150 Ohm Input, 20Hz to 22KHz)	-126dBu
S/N Ratio (Unity Gain, unwtd, Ref. = +4dBu, 20Hz to 22KHz)	>101dB
Common Mode Rejection Ratio (1KHz, 55dB Gain)	>55dB
Gain Control Range (+/-1dB)	0dB to 55dB
Maximum Input Level (Unity Gain, 1KHz @ 0.5% THD+N)	+11dBu
Phantom Power (+/- 2VDC)	+48VDC
Instrument Input (1/4" TRS, Preamps 1 & 2)
Input Impedance	1 Mega Ohm
Line Inputs (1/4" TRS, Preamps 3 to 8) All measurements Line Input to Direct Output
Frequency Response (+0,- 0.5dB)	20Hz to 60KHz
Frequency Response (+0/-3.0 dB)	20Hz to 150KHz
Input Impedance (Balanced)	10 KOhm
THD+N (unwtd, 1KHz @ +4dBu Output, Unity Gain)	< 0.0015%
S/N Ratio (Unity Gain, unwtd, Ref. = +4dBu, 20Hz to 22KHz)	>101dB
Gain Control Range (+/-1dB)	-12dB to +10dB
Maximum Input Level (Unity Gain, 1KHz @ 0.5% THD+N)	+22dBu
Insert Jacks (1/4" TRS)
Send Output Impedance (Unbalanced, Ring)	51 Ohm
Return Input Impedance (Unbalanced, Tip)	10KOhm
Direct Outputs/DAC Outputs (1/4" TRS)
Output Impedance (Impedance Balanced)	51Ohm
Signal Level LEDs
Clip (+/- 0.5dBu)	+18dBu
Digital Audio
ADC Dynamic Range (Awtd, 48KHz Sample Rate)	107dB
DAC Dynamic Range (Awtd, 48KHz Sample Rate)	110dB
Bit Depth	24
Reference Level for 0dBFS	+18dBu
Digital Audio Output (2-Toslink™ Connectors, 8 channels)	ADAT/SMUX
Digital Audio Input (2-Toslink™ Connectors, 8 channels)	ADAT/SMUX
Internal Sample Frequency Selections (KHz)	44.1, 48, 88.2, 96
External Sample Frequency Inputs	BNC, ADAT (SMUX)
BNC Word Clock Output Level (75 Ohm load)	4.5V
BNC Word Clock Input Level Range	3.0 to 5.5V
Jitter Specification	<20ps RMS, 20Hz-20kHz
Jitter Attenuation	>60dB; 1ns in approx.1ps out
Power
Input Voltage (factory configured)	18 to 30VDC
Power Requirements (Continuous)	15W
DC Input Connector Type	5.5mm OD/2.5mm ID Barrel, Center Positive
External Switching Power Supply	90-230VAC/35W
Physical
Main Chassis
Package Type	1U - steel chassis
Dimensions	19(W) X 1.75(H) X 7(D) inches
Weight	7.0lbs