Specialized in the design and manufacture of high-end loudspeakers and loudspeaker cabinets, Atohm also designs and offers amplification modules with a very high level of performance. Thanks to their sophisticated signal processing, Atohm modules offer a wide choice of settings and connections to meet a wide range of applications such as closed-load active subwoofers or Bass-Reflex, active loudspeakers or monophonic power blocks. All this while offering excellent technical performance and musicality in a small footprint.

Important studies have been carried out by the brand on components, schematics, layout topology, power supply as well as general construction to develop the best products.

The S250 Atohm Amplifier Module includes many features and specifications :

• Ice Power TM output stage with a power of 220W RMS under 4 Ohm. Class D technology, ensuring an excellent efficiency of 80% and a high damping factor, making the module compatible with any load impedance greater than or equal to 3 Ohm. Great musicality and generous power in a very small footprint.
• Peak limiter section with 2 levels: 0dB and -1dB, with "Soft Clipping". When clipped (excess input level), a sinusoidal signal is transformed into a square signal containing an infinite number of perfectly audible odd harmonics (distortion). In a subwoofer application, this distortion distorts the sound and makes it possible to perfectly locate the subwoofer because it contains high frequencies. The clipping limiter associated with the low-pass filter stages (variable or LFE) reduces or eliminates clipping distortion.
• X-Guard technology overcomes the drawbacks of a conventional subsonic filter by ensuring that the speaker excursion never exceeds an absolute limit (risk of breakage, very high distortion) regardless of the amplitude of the input signal. This technology preserves the signal and its phase (unlike a subsonic filter). The extreme bass is more faithful, the connection with the main speakers more homogeneous and the speaker protected. The S250 offers two settings (X30 and X35) for this X-Guard technology (refer to the manual in the "Download" tab of this page).

It is possible to connect the module via the pre-out/subwoofer outputs of a preamplifier/processor or directly to the speaker outputs (in parallel) of a conventional stereo amplifier. The S250 module can also be by-passed to high performance HiFi broadband use (mono block) via a simple internal switch. In this case, only the gain control remains active. This can be used to create monitor speakers for example.