Wolff Audio RefPre 500 Series Microphone & Instrument Preamp

The Wolff Audio RefPre 500 Series microphone and instrument preamp delivers clean, transparent sound with minimal circuitry. This reference preamp keeps your audio true to the source, using a transformerless design and relay-based switching for reliability. With a stepped rotary switch, users can adjust gain from -10dB–60dB in 10dB steps, supporting everything from high-output condensers to delicate ribbon microphones. Ribbon mode automatically increases gain to 70dB and protects the mic from phantom power. The unit’s frequency response holds steady from 10Hz–80kHz, and the +28dBu output headroom covers everything from heavy drums to soft vocals. Front and rear panel inputs plus a dedicated Hi-Z amp for instruments add studio flexibility.

Wolff Audio Build Delivers Uncolored, Accurate Recording

Engineers who track with sampling or emulation microphones, like the Slate VMS, benefit from this preamp’s transparent sound. Its low noise floor and high headroom suit detailed work with mics such as the Neumann TLM 103 or Earthworks TC25. The continuous output fader, trim control and high-pass filter offer precise control for any signal. Switching polarity and phantom power keeps the workflow safe for delicate ribbon styles. Every session gains repeatable accuracy, helping users capture the real detail of their instruments and vocals without added color.