AudioRoot Femto Pre-amp

AudioRoot FEMTO Microphone Preamplifier

The AudioRoot FEMTO is a battery-powered two-channel microphone preamplifier for location recording, including ENG, EFP and music recording. It combines high gain and low noise with a robust, powder-coated aluminum enclosure with engraved markings.

Key Features

• Two microphone channels with high gain and low noise.
• 48 V phantom power.
• 80 Hz high-pass filter with a slope of 12 dB/octave.
• Bright OLED screen, readable in sunlight.
• Two microphone inputs with 3-pin XLR connectors.
• Balanced line-level output with a 5-pin XLR connector.
• High-quality audio potentiometers.
• Lightweight aluminum enclosure.
• Stated battery life of approximately six hours when used with two Schoeps CMC64Ug microphones.

Power and Dimensions

• Weight without batteries: 327 g.
• Dimensions: 95 x 129 x 42 mm.
• Internal power: two 9 V batteries, type 6LR61.
• External power: 12-18 V via a 4-pin Hirose connector.

Technical Specifications

• Input impedance: > 5 kOhm.
• Minimum gain: 18 dB. A version with a minimum gain of 6 dB is available upon request as the FEMTO-L.
• Maximum gain: > 70 dB with a source impedance of 50 ohms and a load of 600 ohms.
• Distortion: 0.002% below 40 dB gain; 0.006% at 60 dB gain.
• Equivalent input noise (EIN): -129.2 dBu at maximum gain with a source impedance of 200 ohms.
• Bandwidth: 15 Hz to 20 kHz, within +/- 3 dB.
• Maximum output level: +18 dBu with a load of 600 ohms and a supply voltage of 16 V.
• Current consumption with an external 18 V supply: 44 mA with phantom power off; 82 mA with 48 V phantom power on and two Schoeps CMC6Ug microphones.
• Current consumption with internal power: 31 mA with phantom power off; 67 mA with 48 V phantom power on and two Schoeps CMC6Ug microphones.

FEMTO and uPRE MKII Comparison