Source: Press Release, Last Accessed: 2014/09/24

ATC announced the availability of two new high-performance reference near field monitors — the active SCM20ASL Pro (V2) and passive SCM20PSL Pro, the former replacing the previous-generation SCM20ASL Pro, and the later being an all-new product, providing an entry point into ATC studio monitoring at a lower price point.
Both models feature ATC’s renowned drive units, hand built in its UK facility. Of particular note is the new SH-25-76S 25mm/one-inch soft dome tweeter, the first to be designed and built by ATC, and the result of six years of research and development by Managing Director Billy Woodman and R&D Engineer Richard Newman. “The tweeter is designed and built with the same no-compromise philosophy as all other ATC drive units,” notes Newman, before continuing: “The design takes notes from the highly-regarded ATC midrange dome by utilising a dual-suspension design, negating the requirement for Ferro-fluid, and avoiding the detrimental effects of this drying out over time, a feature considered to be of utmost importance for longterm consistency.” Accoridng to ATC, the massive neodymium motor with heat-treated top plate is optimized to ensure an extended frequency response (-6dB at 26kHz) and low non-linear distortion. The geometry of the waveguide is designed for optimum dispersion and made from a precision-machined alloy so that the entire structure is extremely rigid and free from resonances.
The bass/mid driver used in both loudspeakers is ATC’s proprietary 150mm/six-inch Super Linear device. Constructed with a 75mm/three-inch voice coil and a short-coil, long-gap topology, it combines the high-power handling and low-power compression usually only found in large, high-efficiency systems with the fine resolution and balance of modern high-fidelity systems. Unique to the drive unit is ATC’s Super Linear technology, which, by employing specialist materials in the magnetic circuit, reduces third harmonic distortion in the lower midrange.
The electronics in the active design have also had considerable development time invested in them, resulting in reduced noise and distortion (a further -10dB at 10kHz) and a reduced operating temperature for improved reliability. The amplifier design is a revised version of ATC’s discrete MOSFET Class A/B design with 200W and 50W continuous power available for the bass and high frequency sections, respectively. The user controls have also been improved over the previous generation with more flexible input sensitivity controls and a revised low frequency shelf control to help achieve good balance in difficult acoustic conditions. The amplifier includes protection circuits for both DC offset and thermal overload.
The cabinet has been restyled to more closely follow the larger monitors in ATC’s professional range and is constructed from heavily-braced MDF. Highly damped, elastomeric panels are bonded and stapled to the cabinet’s inner walls to suppress cabinet panel resonances, while the enclosure’s front panel is curved to reduce cabinet diffraction, improving the frequency response and imaging.

For more information: www.atcloudspeakers.co.uk

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