The SL33b from Rolls is a stereo program limiter that provides smooth dynamics processing for mainly consumer-level equipment. It features 1/8" TRS stereo mini and RCA connectors for both the input and output, and includes makeup gain and threshold level controls for exactly tailoring the response.
The unit maintains a consistent volume level for a more comfortable listening experience and can be used in restaurants, night clubs, schools, places of worship, or in the home.
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While the specs show a very low distortion number, the reality appears far different. The Rolls SL33b Stereo Program Limiter was Installed between a Cambridge Audio DAC Magic 100 and a Cambridge Audio Topaz SR20 receiver with the intent to achieve a consistent output level of MP3 music files. Even with input levels showing no limiting whatsoever, there was audible distortion and anomalies in the audio output that were not present without the box being inline. Once any amount of limiting occurred, the resulting distortion in the output was painful on the ears. It sounded like audio clipping rather than the audio limiting. This box might work as a limiter for spoken word audio where sound quality is less of an issue, but as a limiter for musical content, it fails. I returned it.
Good job of controlling audio levels. Used judiciously the Rolls SL33b will prevent gross distortion or overload of the equipment to which it's output is attached. Don't expect FM Optimod or similar processing from this unit. It is a stereo wideband processor. I like it. Not much else out in the market at this price point that is as reliable.