On the one hand, this is a review of the REL T/9i subwoofer. On the other hand, this is a review of the REL T/9i subwoofer. Because this is a review of two REL T/9i subwoofers. More specifically, this is a survey of how most people get deep bass very wrong, and how a pair of well-integrated RELs are the exception.

Let’s start with the T/9i itself. The top dog in REL’s new core T/i series, the T/9i is a solid square piano gloss cube with a new front firing 254mm long-throw drive unit with a steel chassis and a large inverted dust cap. This is joined by a matching 254mm downward firing passive radiator. Adding depth to the cabinet makes the cabinets act like a concert hall, designed to properly dissipate rather than propagate the back wave.

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http://www.hifiplus.com/articles/rel-t9i-subwoofer-or-two/?page=1