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SPM5 500 Series Mic Preamp

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Item: N13-2238

Availability: In stock



SPM5 500 Series Mic Preamp
SPM5 500 Series Mic Preamp SPM5 500 Series Mic Preamp


Designed by industry visionary Paul Wolff , the SPM5 features a Class A discrete front end while utilizing the same TX100 output transformer used in our Tonelux products.  The Radiance control adds the right amount of filtering creating a presence of 2nd order harmonics without increasing your gain.

A 70 Hz HI Pass filter was added to eliminate unwanted low end and rumble from your tracks. An impedance switch allows your preamp to work properly with Ribbon microphones that have a 50 Ohm load, and on the front panel is a combo XLR/1/4" jack making it easy to use different microphones as well as D.I. boxes.


  • Mic, Instrument, Line Level Inputs
  • Radiance Control for Harmonic Distortion
  • Adjustable Input & Output Gain Controls
  • Selectable Impedance for Ribbon Mics

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  • Input Impedance Mic: 2 kΩ
  • Instrument: 1 MΩ
  • Common Mode Rejection 70 dB
  • EIN -127.5 dBu, un-weighted, 150 Ω source
  • Distortion 0.001%, +4 dBu output, 1 kHz
  • Frequency Response 10 Hz to 70 kHz (-3 dB)
  • Gain Overall Mic Gain: 70 dB (60 dB preamp gain, 10 dB output gain)
  • Maximum Input Before Clipping Mic: +4 dBu
  • Instrument: +22 dBu
  • Maximum Output Before Clipping: + 28 dBu (10 kΩ load)
  • HPF 12 dB per octave cut @ 70 Hz
  • Nominal Output Level +4 dBu (electronically balanced)
  • Output Impedance 100 Ω
  • Noise Floor Output Noise Floor: -85 dBu (typical, with ~40 dB mic gain)
  • Meter PPM: 8-segment LED bar graph
  • Current Requirements 130 mA (maximum), per rail

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