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-1 has a 19" wide mainframe rack-mount chassis (1.75"H x 19"W x 8"D) and can be ordered with 1 to 4 channels. There are two meter options and the best Jensen output transformer (JT-11-BMQ) is also available as an option. Additional channels and options can be easily added later up to the total capacity of the mainframe.The M-1 was introduced in 1987, and while sonically identical to the M-2, there are a few control differences. The M-1 has a two-section gain-pot providing continuous variable adjustment in two overlapping ranges that are selected by the "HIGH GAIN" switch. The M-2 has a 16 position gain-switch with 1% metal-film resistors providing accurate and repeatable gain settings. Since the "HIGH GAIN" switch isn't necessary, the M-2 is available with either a "20 OHM MIC" switch OR a "20dB PAD" switch. 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. Dual range gain control and'high gain' switch - provides great feel and resolution for easy and accurate adjustments. All front panel switches are LED illuminated. 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. VU-1 - Very accurate and informative 20 segment LED meter card with separate peak LED for monitoring preamp output.
PK-1 - Peak LED metering only (not required if VU-1 is installed). JT-11 - BMQ output transformer. Pin 2 or pin 3 high - can be ordered either way, and internal jumpers make changes in the field easy.