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.

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.

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..

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.