Designed to fulfill unique high-end requirements…

FEMTO is the natural extension in our product range in terms of directivity and integration into a reverberant room. This loudspeaker will maintain the distinctive qualities our products offer in terms of sound stage, precision, resonance free reproduction. Listening sweet spot is practically absent 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.

Suggested end user price; 4'640.- CHF per unit

Technical features

• Two-Way 80 Hz to 28 kHz frequency range

• Anti-Resonance Full Aluminum CNC-Machined Enclosure

• Aluminum Diaphragm, optimized geometry that achieves metamaterial performance

• Custom designed high frequency driver

• Coherent Coverage on Stated Frequency Response

• Offers 70°H x 50°V directivity control over an important part of the spectrum

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