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John Hardy Company M-2 4-Channel
4-Channel Microphone Preamplifier

OUR PART #:  M-2-4CH

The M-2 Mic Preamp is among the finest mic preamps in the world. It provides the accuracy and transparency that is missing in other mic preamps.
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Our Price: $3,060.32
List Price: $3,085.00

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John Hardy Company M-2 4-Channel
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The M-2 Mic Preamp is among the finest mic preamps in the world. It provides the accuracy and transparency that is missing in other mic preamps. No matter what your application, the M-1 will provide superior sound quality. The world's best input transformer (Jensen JT-16-B), best op-amp (990 discrete op-amp) and the elimination of all capacitors from the signal path combine to provide the highest performance.

The M-2, introduced in 1996, is a variation of the M-1.  While the M-2 is sonically identical to the M-1, there are a few control differences. The first difference is the gain controls: The M-1 has a two-section gain-pot providing continuously variable adjustment in two overlapping ranges of 12 to 40 dB and 32 to 60 dB (higher gain available on request). The “HIGH GAIN” switch changes ranges. The M-2 has a 16-position gain-switch with 1% metal-film resistors, providing accurate and repeatable gain-settings from 15 to 60 dB in steps of 3 dB.

Further differences involve the push-button switch to the right of the gain-pot or gain-switch. The M-1 has a “HIGH GAIN” switch as mentioned above. Since this switch is not required in the M-2, the p.c. board layout was modified to allow that switch to be used in the M-2 as either a “20 Ohm MIC” switch, or a “20dB PAD” switch, depending on how the board is assembled. The 20 Ohm MIC switch provides optimum matching of microphones with extremely low output impedances. The 20dB PAD switch attenuates the input signal by 20 dB prior to the JT-16-B input transformer, providing a maximum input level of +29 dBu.

This M-2 has a 19" wide mainframe rack-mount chassis (1.75"H x 19"W x 8"D) and 4 channels.

Features:

  • VU-1 deluxe meter card option included
  • JT-11-BMQ Output Transformer option included.  Jensen's best mic output model.
  • JT-16-B Input Transformer. Jensen's best mic input model.
  • 990 Discrete Op-Amp. Faster, quieter, more powerful and better sounding than typical monolithic op-amps.
  • Elimination Of All Coupling Capacitors From The Signal Path. Results in less degradation of the audio signal.
  • "20 Ohm MIC" Switch OR "20dB PAD" Switch (Call your Sales Pro for details)
  • 16-Position Rotary Gain-Switch with 1% metal-film resistors
  • Polarity Reverse Switch.
  • Phantom Power Switch.
  • All Front Panel Switches Are LED Illuminated.
  • Gold Plated XLR Connectors for maximum reliability.
  • Ground Lift Switch On Each Channel. Helpful for eliminating ground loops.
  • Toroidal Power Transformer With Additional Shielding. Eliminates hum problems so no external power supply is needed.
  • Universal Power Supply. Internal switch provides six primary voltage choices to accommodate use anywhere in the world.
  • Chassis Ground Isolation Switch. Helpful for eliminating ground loops.
  • Built To Order, the way YOU want It. Various options can be easily field installed at a later date.

Specifications:

  • E.I.N., 20Hz - 20kHz Unweighted: 
    *  150 Ohm source:  -129 dBU
    *  0 Ohm source:  -132 dBU
  • Maximum Input Level  >30Hz:  +9 dBU
  • Maximum Input Level with pad >30Hz:  +29 dBU
  • Maximum Output Level at 990 Output:  75 Ohm load +24 dBU
  • CMRR:
    *  100Hz:  100 dB
    *  10KHz:  80 dB
  • Deviation from Linear Phase:  20Hz - 120kHz < 2 deg
  • THD, JT-16-B (Below Saturation): 
    *  20Hz:  0.036%
    *  30Hz:  0.022%
    *  50Hz:  0.010%
    *  1KHz:  0.003%
  • THD, JT-16-B & 990:
    *  60db Gain, 10k Ohm Load, +24dBu Output  10kHz  0.005  %;  1kHz  0.004  %
    *  40db Gain, 600 Ohm Load, +24dBu Output  10kHz  0.003  %;  1kHz  0.003  %
    *  40db Gain, 75 Ohm Load, +24dBu Output  10kHz  0.030  %;  1kHz  0.005  %
    *  DC Offset   <100  uV

Optional Equipment Included!

  • The VU-1 Meter Card is a very accurate and informative meter that directly monitors the output level of the MPC-1 mic preamp card. There is no need to monitor the input level of the MPC-1 because the output will clip before the input transformer saturates. The VU-1 provides a 20 segment LED bargraph display and separate “peak” LED (labeled “PK” on the front panel) to indicate extremely high signal levels. An LED-illuminated front panel switch (green LED) gives a choice of “Peak” or “VU” meter ballistics. The “Peak” ballistic provides a fast attack time for the bargraph so that transients are fully indicated. The “VU” ballistic provides a slower attack time, similar to a standard mechanical VU meter. The meter scale accurately covers -28 to +10dB in linear steps of 2dB (15 yellow LEDs, 5 red LEDs). Easy calibration of the meter's 0VU operating level is accomplished by moving an internal plug-in jumper to one of four positions: 0dBu, +4dBu, +8dBu or ADJustable. The “ADJ” position covers a range of -10 to +12 dBu via a 25-turn trim pot. Standard setting is “+4” (0VU on the meter scale equals a +4 dBu output level).
  • The JT-11-BMQ Output Transformer is the best Jensen line-output transformer. It compliments the outstanding line driving capability of the 990C by providing a balanced, floating, isolated output. Ground loop problems are eliminated because the signal is coupled magnetically rather than directly, something that transformerless circuits cannot do. Your application may not require an output transformer, but if you need one, the JT-11-BMQ is the best.

 

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