Shown last year in prototype, the production version of Canadian speaker system manufacturer Adamson's T21 sub is now available. A 6kW unit running two 21" drivers with 6" dual coils on double spiders, this beast produces super powerful extended low-end. Shifting one box in a stack of three back one quarter length - and using some slick DSP - can eliminate most of the backward firing energy of what is generally an omni-directional radiator at such low frequencies.
