ATTO

ATTO: Sound Excellence Redefined...all aluminum enclosure, and it's active!

Introducing our latest masterpiece in high-end audio innovation – the ATTO. Building upon the exceptional qualities of our renowned FEMTO, the ATTO stands as a testament to our commitment to pushing the boundaries of audio perfection. Crafted with precision and care, the ATTO embodies the epitome of audio excellence.

Constructed from premium 15mm aluminum plates, the ATTO boasts a sturdy and resilient build, ensuring minimal resonance and vibrations. This meticulous craftsmanship guarantees that the cabinet remains virtually free from unwanted distortions, allowing you to enjoy pure, unadulterated sound. The ATTO incorporates the same exceptional components as our DECA and FEMTO, ensuring that the essence of our audio expertise is preserved. From the customized High Frequency Driver to the precision-engineered wave guide, every aspect of the ATTO is a testament to our unwavering dedication to sonic perfection.

ATTO is available only as a fully active concept. The electronics implemented include a high quality 2 x 125W amplifier that exceeds by far the requested power of the drivers in use. To manage the drivers probably one of the best DSP platforms has been implemented. It offers state-of-art performance never seen before with COTS crossovers. The SHARC ADSP-21565 is the most powerful DSP crossover ever used in an embedded crossover design, operating at 192kHz with S/N > 123dB.

The ATTO, proudly designed and manufactured by Lange Loudspeakers SA in Switzerland, showcases the pinnacle of Swiss engineering excellence. Every detail, from the drive units to the cabinet, reflects our passion for crafting audio equipment that stands the test of time.

Suggested end user price; 3'950.- CHF per unit

Technical features


Suitable applications


Technical Description

Imagined, designed and manufactured in house!

Compression drivers with their inherent efficiency are difficult to design and implement into a system. We decided to design a high frequency driver based on a high end magnesium dome usually found in directly radiating dome tweeters. With a powerful 15'000 Gauss magnet and high Xmax capabilities the moving assembly can reach 1200 Hz with ease while extending its frequency response up to 28'000 Hz  thanks to a 3 channel circumferential Phase Plug.

Probably the broadest VHF coverage in the industry

Coupled to our wave guide our HF driver achieves an excellent directivity up to 28'000 Hz, well beyond the human hearing threshold. With a mean directivity of 110° (-6dB) up to 20 kHz and beyond, the ATTO is likely one of the few loudspeakers to achieve this level of performance.

Designed and manufactured in house!

The driver design incorporates a comprehensive array of refinements aimed at simplifying manufacturing and ensuring reliable operation within our loudspeaker systems. Our approach meticulously addresses manufacturing tolerances to enhance performance. Beginning with the magnet, we have adopted a slug type design for multiple reasons: it offers optimal efficiency, minimizes reflections towards the diaphragm due to its compactness, and facilitates superior cooling of the coil. Additionally, the coil support features strategically placed ventilation holes to minimize mechanical resistance (Rms) and promote highly efficient operation. The diaphragm has been designed to maximize frequency response by employing a transitional geometry rather than a dome or cone shape. Constructed from anodized aluminum and coupled with nitrile suspensions, it minimizes tolerances (reducing Mms tolerance) effectively. The absence of a dust cap further contributes to keeping tolerances to a minimum. The frame is CNC-manufactured, facilitating precise centering of all components during production. Its geometry effectively dissipates heat from the coil and promotes the smooth flow of acoustic energy, thereby minimizing reflections..


All key elements have been designed internally

Our low-mid frequency driver features a modern voice coil with a two-layer copper-clad aluminum wire, an upgraded and highly efficient slug type magnet with N52 grade neodymium, a one-piece oxidized aluminum diaphragm with transitional geometry, and a nitrile suspension. These enhancements are aimed at boosting overall performance and significantly reducing variations in loudspeaker driver performance.