FEMTO

AUDIOROOT FEMTO – Portable Battery‑Powered Stereo Microphone Preamplifier

The AUDIOROOT FEMTO is a premium, ultra‑portable stereo microphone preamplifier engineered for professional location sound recording. Designed for ENG, EFP, documentary, interviews and music capture, the FEMTO delivers exceptionally clean gain, ultra‑low noise performance and true 48V phantom power in a compact, rugged form factor.

With dual XLR3 microphone inputs and a balanced XLR5 stereo output, the FEMTO integrates seamlessly with field recorders, mixers and wireless links. A bright OLED display provides instant visibility of gain, levels and battery status, while the 80 Hz high‑pass filter helps control rumble and handling noise in demanding environments.

Built from powder‑coated, engraved aluminum, the FEMTO is lightweight yet extremely durable, offering up to 6 hours of operation from two standard 9V batteries — even when powering condenser microphones.

Estimated delivery time: 1–2 weeks.

Key Features

• High‑gain stereo microphone preamps: +10 to +64 dB

• True 48V phantom power for condenser microphones

• Dual XLR3 balanced microphone inputs

• Balanced stereo XLR5 output

• Sunlight‑readable OLED display

• 80 Hz high‑pass filter, 12 dB/oct

• Premium audio potentiometers for precise gain control

• Rugged aluminum chassis, powder‑coated and engraved

• Lightweight: only 327 g

• Battery runtime up to 6 hours (2× 9V)

• External powering: 12–18 V via Hirose 4‑pin or barrel connector

Included in the Box

• XLR5 to 2× TA3F balanced output cable

Specifications

• Input impedance: > 5 kΩ

• Gain range: +10 dB to > +64 dB

• THD:

  • 0.002% @ 40 dB gain

  • 0.006% @ 60 dB gain

• Equivalent Input Noise (EIN): –129.2 dBu (200 Ω source, max gain)

• Bandwidth: 15 Hz – 20 kHz (±3 dB)

• Maximum output level: +18 dBu (600 Ω load, 16 V supply)

• Power consumption (external 18 V):

  • 44 mA (48V off)

  • 82 mA (48V on + 2× Schoeps CMC6Ug)

• Power consumption (internal batteries):

  • 31 mA (48V off)

  • 67 mA (48V on + 2× Schoeps CMC6Ug)

• Power input connectors: Hirose 4‑pin or Switchcraft barrel

Recommended External PSU

• Femto PSU (not included)

Applications

• ENG / EFP

• Documentary and field recording

• Music and acoustic capture

• Interviews and broadcast

• Portable high‑quality mic preamplification