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ATC unveiled passive wall-mounted studio monitors SSM12i Pro and SSM25i Pro, designed for flush wall/ceiling installation in studios, broadcast control rooms, and custom systems.
SSM12i Pro is a sealed two-way monitor using SB45‑150CLD woofer and SH25‑76 tweeter, 2.2 kHz crossover, 56 Hz–22 kHz response.
It delivers 85 dB sensitivity, 8-ohm impedance, recommended 75–300 W amplification, with 108 dB continuous and 114 dB peak maximum sound pressure.
ATC’s decision to keep both SSM models sealed and explicitly optimized for flush mounting says more than the spec sheet alone. In-wall and soffit installations fundamentally change how low-frequency energy couples to the room, and a closed enclosure avoids the phase and port-tuning uncertainties that reflex designs can introduce when boundary-loaded. This approach prioritizes predictable transient behavior and time-domain accuracy—traits ATC has historically valued over headline bass extension. From an engineering standpoint, these monitors are clearly designed to behave as part of the room structure rather than as free-standing sources, which explains the conservative efficiency figures and the expectation of robust external amplification.
The divergence between the two models is less about output and more about how the workload is distributed. The two-way SSM12i Pro places significant responsibility on its midbass driver, a layout that favors coherence and point-source behavior in near-to-midfield control rooms. By contrast, the three-way architecture of the SSM25i Pro offloads vocal-band and presence-region duties to a dedicated soft-dome midrange, a classic ATC move aimed at reducing intermodulation and maintaining low distortion at higher monitoring levels. This makes the larger model better suited to main monitor roles in broadcast or scoring environments where sustained level and tonal stability matter more than compactness.
Across sources, there is a shared emphasis on consistency rather than spectacle. Neither model chases ultra-high sensitivity or exaggerated bandwidth; instead, the designs assume high-quality power, careful system integration, and engineers who value repeatability from room to room. In that sense, the SSM12i Pro and SSM25i Pro feel less like new product categories and more like architectural tools—monitors intended to disappear into the build while leaving behind a familiar ATC sonic fingerprint: controlled dynamics, restrained voicing, and an almost stubborn refusal to flatter the mix.
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