12 Audio Products from InfoComm 2017 Worth Keeping an Ear On, slide 5

d&b

Engineered for permanent installations as a companion to its xS-Series and xA-Series, the 21S Subwoofer from d&b Audiotechnik is ground stackable or it can be flown as an individual unit or clusters of two cabinets. D&B says the 21S plays down to 33Hz, and when paired with its D80 amplifier it can produce SPL levels as high as 135dB. The bass-reflex design 4-ohm subwoofer features a 21-inch driver with a neodymium magnet, and it utilizes a marine plywood enclosure, black finish and metal grille.

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12 Audio Products from InfoComm 2017 Worth Keeping an Ear On