uPRE MKII

AUDIOROOT uPRE MKII – Portable Stereo Microphone Preamplifier with AES/SPDIF Output

The AUDIOROOT uPRE MKII is a compact, battery‑powered stereo microphone preamplifier designed for ENG, EFP, documentary, music and field recording applications. As the upgraded successor to the original 2010 uPRE, the MKII introduces a redesigned electronic architecture and a high‑resolution 24‑bit / 192 kHz AES/SPDIF digital output, making it suitable for modern hybrid and digital workflows.

With two electronically balanced microphone inputs, individually switchable 48 V phantom power, an 80 Hz low‑cut filter, stereo link, M/S decoding, and both analog and digital outputs, the uPRE MKII provides a versatile and professional front‑end for portable recorders, mixers and wireless systems.

Its rugged polyamide/aluminum hybrid housing, flexible powering options and compact form factor make it ideal for demanding field environments.

Estimated delivery time: 1–2 weeks.

Key Features

• 2 electronically balanced microphone inputs (Switchcraft mini‑XLR)

• 48 V phantom power on each channel (high‑efficiency design)

• Gain range: –50 dB to +80 dB

• 80 Hz low‑cut filter (12 dB/oct) on both channels

• 3‑LED level meter per channel + low‑battery indicator

• Stereo link mode

• M/S decoding (also usable as a mono mixer)

• Unbalanced stereo analog output (mini‑XLR5)

• Digital output: AES (default) or SPDIF, 24‑bit / 192 kHz

• Hybrid polyamide/aluminum housing

• Compatible with iPOWERUS LiPo batteries

Technical Specifications

Audio

• Input impedance: > 5 kΩ

• Distortion: 0.003% @ 40 dB gain

• Frequency response: 10 Hz – 70 kHz

• Maximum output level: +17 dBu

Power

• Battery: 2 × 9 V

• External power: 9–18 V DC (Hirose connector)

• Battery runtime:

  • up to 10 hours (dynamic mics, ADC off)

  • approx. 5 hours (condenser mics, ADC on)

• Smart switching between battery and external supply

• Recommended PSU: Mean Well GE12I18‑P1J (not included)

Physical

• Dimensions: 130 × 85 × 30 mm

• Weight: 255 g

Optional Cable Kit

• 2 × XLR microphone input cables

• 1 × mini‑XLR5 → 2 × mini‑XLR3 stereo output cable

• 1 × XLR3 AES digital output cable

Applications

• ENG / EFP

• Documentary and field recording

• Acoustic music capture

• Broadcast and interviews

• Portable preamp front‑end for recorders or wireless systems