Steg Master Stroke | SST50 - One-way 2.2" Car Audio Air Motion Transformer Set

Steg - Handcrafted To Perfection In Italy Since 1983
Music is a powerful form of emotional expression, conveyed through sound waves. It has a unique ability to deeply affect individuals, more so that any other form of media. Steg is an Italian electronics manufacturer that has dedicated itself to creating these audio experiences, experiences that are authentic and faithful to the original source; conveyed with the intention of capturing the true essence of music. Steg strives to ensure that nothing hinders the pure enjoyment of music, not even the less-than-ideal acoustic conditions of a car interior. Since its conception in Italy in 1983 Steg has been designing and manufacturing high quality audio components specifically for automotive applications, with the sole aim of delivering unparalleled sound quality. With an unwavering commitment to breaking the limit of what's possible, Steg is the definitive solution when it comes to achieving world-class audio reproduction in vehicles.

Master Stroke Series - Audio Engineering Magnificenza
The Stge Master Stroke competition collection features the pinnacle of sound quality oriented loudspeakers, meticulously crafted to deliver extraordinary performance. Exclusively comprised of active driver sets, the Master Stroke drivers benefit from expert tuning to realise their absolute maximum potential. Every detail has been refined to achieve unrivaled audio excellence, thus ensuring an immersive and captivating experience for discerning audio enthusiasts.

Design Ideologies
Discover the SST50, an air motion transformer from Steg that stands out for its excellent technical specifications. Featuring a 2.2″ AMT tweeter with aluminum foil and a CNC-machined aluminum front, this model delivers a clear high-quality sound.

Energetic Sound
The SST50 air motion transformer (AMT) tweeter has a clear, dynamic and energetic sound presence; a very good impulse response and a high low distortion. Particularly noteworthy is its resonance frequency of 3300 Hz and 4 Ohms, making it usable from 4.5 kHz at 18 dB/octave.

Modest Dimensions
With its outer diameter of 55 mm and mounting diameter of 41.2 mm, not to mention its mounting depth of 19.4 mm; this driver can easily integrate into any installation. Indeed, its compact size allows for easy integration. Once installed it’ll happily provide endless hours of impressive audio experience.

Coil-Less Concept
Air motion transformers represent a loudspeaker concept that does not require a classic voice coil. Using a thin Kapton foil measuring 12 µm – 25 µm in thickness, against a specially designed conductor track made of thin aluminum also only 12 µm – 25 µm thick); these ribbons move in a reciprocal motion to agitate air.

Wikipedia puts it like this: The diaphragm pushes back and forward from itself in a physical motion similar to that observed when an accordion is pushed in and pulled out to pump air through the reed chambers, albeit over an exceedingly smaller motion range. The result is a dipole driver with an extraordinarily rapid response rate, enabled by the extremely low mass of the polyethylene substrate and the far smaller distance it travels on each “swing” compared to a dynamic driver. In this technical respect, it shares characteristics with an electrostatic driver.

The discernible motion of each diaphragm flexure is very small, but because of the folded structure more air is moved than would be by a conventional cone or electrostatic driver of the same plotted surface area. As a matter of surface comparison, a standard 1″ / 25 mm AMT strip has a functional driver area comparable to an 8″ / 200 mm circular dynamic cone. The folded driver design, combined with the small motion range; means the AMT acts like a point source version of a larger driver, inherently resulting in lower sound reproduction distortion. The speed of the air as it leaves the diaphragm is approximately five times faster than the speed of the actual driver structure, hence the name Air Motion Transformer.

Can We Have That In Plain-Speak
If the above description is a little over the odds for your level of understand let’s break it down a little. Put succinctly; unlike conventional tweeter domes the folded AMT diaphragm in the loudspeaker does not make any movement from the front and to the rear to produce the tones. The movement takes place in the folds. This laterally, similar to a bellows. This causes the air in the convolutions to accelerate and exit the front. One advantage of this technology is that the diaphragm area is larger than the visible area and thus takes up less space. Coupled with the light weight of the diaphragm, this results in a detailed and dynamic reproduction.

Design Features
The rich heritage of this astute and masterful designer, together with its ever-increasing technical acumen; is conducive to these components featuring a vast array of impressive design ideologies and latest technological advancements. Some of these include:
– Tweeter with air motion transducer (AMT) principle technology.
– Folded kapton diaphragm.

Electrical Specifications
– Nominal configuration: one-way 2.2″ air motion transformer set
– Continuous power handling: 10 Watts
– Maximum power handling: 50 Watts
– Voice coil length: 25 mm
– Frequency response: 4500 Hz – 50000 Hz
– Sensitivity: 89 dB
– DC resistance (Re): 3.2 Ohms
– Resonant frequency (Fs): 3300 Hz

Physical Specifications
– Mounting diameter: 41.2 mm
– Mounting depth: 19.4 mm
– Weight: 0.7kg

Documentation
– User manual