Femto microphone preamp

The AUDIOROOT FEMTO is a premium, ultra-portable stereo microphone preamp designed for professional location sound recording—perfect for ENG, EFP, interviews, and music sessions.

Compact yet powerful, the FEMTO offers high gain (from +10 to +64 dB), ultra-low noise performance, and true 48V phantom power for condenser microphones. It features dual XLR3 mic inputs and a balanced stereo XLR5 output, ensuring seamless integration with your professional setup.

A sunlight-readable OLED screen gives you instant visual feedback on levels and battery status, while a 12dB/oct 80Hz high-pass filter helps clean up unwanted low-end rumble. With premium audio potentiometers, precise gain control is always at your fingertips.

Built to withstand tough environments, the FEMTO is housed in a powder-coated, engraved aluminum chassis that’s both lightweight and extremely durable.

🔋 Power-efficient, the FEMTO offers up to 6 hours of runtime using just 2 standard 9V batteries, even while powering two phantom-powered mics. External power (12–18V) is also supported via Hirose or barrel connector.

🔧 Key Features

• 🎚️ High-Gain Mic Preamps: +10 to +64 dB

• ⚡ 48V Phantom Power

• 🧹 80Hz High-Pass Filter: 12dB/oct slope

• 📺 OLED Display: Bright and sunlight-readable

• 🎤 2x XLR3 Inputs: Balanced microphone inputs

• 🎛️ Balanced Stereo Output: XLR5 connector

• 🌀 Premium Potentiometers: Smooth, precise control

• 🛡️ Rugged Build: Powder-coated, engraved aluminum

• 🪶 Lightweight & Compact: Only 327g

• 🔋 Battery Life: Up to 6 hours (2x 9V)

• 🔌 External Powering: 12–18V via Hirose or barrel connector

📦 Included in the Box

• 🧩 XLR5 to 2x TA3F Balanced Output Cable

🔍 Specifications

• 📈 Input Impedance: > 5 kΩ

• ➕ Gain Range: +10 dB to > +64 dB

• 🔉 Distortion:

  • 0.002% @ 40 dB

  • 0.006% @ 60 dB

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

• 📡 Bandwidth: 15 Hz – 20 kHz (±3 dB)

• 🚀 Max Output Level: +18 dBu (600Ω load, 16V supply)

• ⚙️ Power Consumption (External 18V):

  • 44 mA (48V off)

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

• 🔋 Power Consumption (Internal):

  • 31 mA (48V off)

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

• 🔌 Power Input Connectors: Hirose 4-pin or Switchcraft barrel

🔌 Recommended External PSU (not included)

MEAN WELL GE12I18-P1J

The AUDIOROOT FEMTO is your go-to choice for pristine, reliable, and portable microphone amplification—engineered for professionals who demand uncompromising quality in the field.