Stroud, Gloucestershire, UK – ATC is expanding its professional loudspeaker portfolio with the introduction of the SSM Series, a new generation of shallow, wall and ceiling-mount passive studio monitors designed for modern control rooms, surround and immersive audio environments. The range launches with two models – the SSM12i Pro and SSM25i Pro – alongside the new R4-150 Pro, a four-channel power amplifier that makes an ideal partner to the new loudspeaker series.
Designed for Space-Critical Installations
Both SSM models feature very shallow enclosures – 147 mm / 5 13/16” for the two-way SSM12i Pro and 198 mm / 7 13/16” for the three-way SSM25i Pro – including mounting hardware. This enables integration into control rooms where room width, depth and ceiling height are critical constraints.
The cabinets can be mounted in either portrait or landscape orientation and use a robust mounting system that attaches flat to a wall or ceiling. A pivoting mechanism allows precise aiming toward the mix position, enabling improved imaging, and in-room response.
Both enclosures incorporate internal steel reinforcement and a safety-tether point to meet the practical requirements of secure professional installation, particularly for overhead mounting.
SSM12i Pro – 2-way
The SSM12i Pro is a passive two-way loudspeaker engineered around ATC’s proprietary drive-unit technology and housed within a sealed cabinet optimised for on-wall/ceiling installation.
Low and mid-range is handled by the SB45-150CLD 150 mm driver, whose Constrained Layer Damping (CLD) cone minimises breakup modes while maintaining linear behaviour across the operating band. Above the 2.2 kHz crossover point, ATC’s SH25-76 25 mm dual-suspension soft-dome tweeter provides low distortion and excellent high-frequency resolution.
Together with a newly developed crossover network – modelled and fine-tuned specifically for on-wall operation – the SSM12i Pro delivers high resolution, controlled dispersion, and accurate translation with compact control & mix rooms.
SSM25i Pro – 3-way
For medium to large control rooms, including those used for mixing Dolby Atmos and other immersive audio formats, the SSM25i Pro offers improved bandwidth and output via a three-way sealed design and three ATC proprietary drive units.
Low frequencies are handled by the SB50-164SC 164 mm/6.5” driver featuring a short-coil/long-gap motor and paper/carbon-fibre composite cone. Mid-range duties are performed by ATC’s renowned SM75-150 75 mm/3” soft-dome – known for its exceptional clarity and minimal coloration – while high frequencies are managed by the SH25-76S tweeter, featuring a high-flux motor to deliver an extended high-frequency response and very low distortion.
The crossover network has again been engineered specifically for boundary mounting, ensuring the speaker delivers ATC’s signature neutrality and transient accuracy even when installed close to surfaces and perfect integration with ATC’s range of active loudspeakers and subwoofers.
Physical Specifications (Selected)
SSM12i Pro (flat portrait orientation inc. hardware):
SSM25i Pro (flat portrait orientation inc. hardware):
Due to weight and overhead mounting considerations, SSM Series products must be installed
by qualified professionals. Both models ship with mounting hardware drilling templates.
R4-150 Pro — Quad-Mono Amplification for Professional Multi-Channel Systems
To complement the SSM Series, ATC introduces the R4-150 Pro, a new 5U rack-mount, quad-mono power amplifier built around four independent power supplies and class A/B MOSFET output stages.
Each channel delivers 150 W continuous, making the R4-150 Pro ideally suited for the dynamic demands of immersive audio and multi-channel playback or bi-amping passive nearfield monitors. Balanced inputs are provided via four XLR connectors with very high common-mode rejection, while outputs use Neutrik NL4 sockets for a secure and reliable connection.
With convection cooling for silent operation and built-in thermal and DC-offset protection, the R4-150 Pro is designed for reliable long-term use in the most demanding professional studio installations. A remote power-on/off trigger further simplifies integration into larger control systems.
Pricing & Availability
All three products are available to order now.
SSM12i Pro is available at a RRP (Recommended Retail Price) of £2167 + VAT per pair.
For more in-depth information, please visit the dedicated SSM12i Pro Product Webpage.
SSM25i Pro is available at a RRP of £4667 + VAT per pair.
For more in-depth information, please visit the dedicated SSM25i Pro Product Webpage.
R4-150 Pro is available at an RRP of £3667 + VAT each.
For more in-depth information, please visit the dedicated R4-150 Pro Product Webpage.
For pricing and availability in your country, please contact your local dealer or distributor.
You can find them listed here in the Where To Buy section of the website.
