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M-1
Personal Microphone Preamplifier:  The M-1 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 Personal Mic Preamp 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 Personal is a self contained single channel mic preamp. There are two meter options and the best Jensen output transformer (JT-11-BMQ) is also available as an option. The M-1 Personal cannot be expanded to have additional channels like the standard M-1 version. Highlights: • JT-16-B Input Transformer. Jensen's best no compromise 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. • Dual Range Gain Control And 'HIGH GAIN' Switch. Provides great feel and resolution for easy and accurate adjustments. • Polarity Reverse Switch. • Phantom Power Switch. • All Front Panel Switches Are LED Illuminated. • Gold Plated XLR Connectors for maximum reliability. • Channel Ground Lift Switch. 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. Options: • VU-1 Meter. 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. Jensen's best line output transformer. • Pin 2 Or Pin 3 High. Can be ordered either way and internal jumpers make changes in the field easy.
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Condensed Specifications:
| E.I.N., 20Hz - 20kHz Unweighted | 150 Ohm source | -129 | dBu |
| 0 Ohm source | -132 | dBu | |
| Maximum Input Level | >30Hz | +12 | 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 |