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What is the REL S/812?

The REL S/812 forms part of the pretentiously titled Serie S range of subwoofers, but never a company to do things by half, the latest additions are a total transformation of REL’s mid-sized class of subs. As a result, unlike the previously released 212/SE, the new S/812 represents a complete revision of the line-up that adds new upgrades and design features.
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https://www.avforums.com/reviews/rel-s-812-subwoofer-review.16886