Designed to fulfill unique high-end requirements…

We are about to introduce a newly designed High End Loudspeaker monitor. FEMTO is the natural extension in our product range in terms of output power to the YOCTO. This loudspeaker will maintain the distinctive qualities YOCTO offers in terms of sound stage, precision, resonance free reproduction. Listening sweet spot is not absent like in a YOCTO but minimized due to a low crossover point, a customized High Frequency Driver and a Horn. High frequencies have a precise directivity up to 20 kHz and way more. It is available as biamp system as well as a passive system and is best paired with 2 x TERA. Entirely milled from a block of aluminum the resonances of the cabinet are practically non-existent. FEMTO is a speaker designed to last a lifetime.

FEMTO is entirely designed and manufactured by Lange Loudspeakers SA in Switzerland, including the drive units.

Technical features

Two-Way 80 Hz to 28 kHz frequency range

Anti-Resonance Full Aluminum CNC-Machined Enclosure

CNC-Machined 3D Diaphragm

Custom designed high frequency driver

Coherent Coverage on Stated Frequency Response

Exceptionally realistic reproduction.

Suitable applications

High-End Home Entertainment

Studio Monitoring 

Home Cinema – THX/Dolby Atmos

Technical Description

Configuration 2-Way Sealed Box System

Recommended amplifier power 50W – 200W into 8Ω on unclipped program.

Net weight 19,4 kg 

Dimensions 254 mm depth, 195 mm width, 270 mm height

Finishes Finely sand-blasted, black anodized or RAL painted.

Drive units 1x Lange 1705-4A LMF Driver / 1 x Lange 1425-8A HF Driver

Frequency range 80Hz to 28kHz

Frequency response 100 Hz to 28kHz (+/-2,5 dB from reference axis)

Sensitivity 89 dB (on axis at 2.00Vrms at 1m)

Harmonic distortion 

2nd and 3rd harmonics (1W-1mt) <0.7% 100Hz – 20kHz

Complimentary Products  Lange Loudspeakers TERA Active Subwoofer