By PSW Staff • February 11, 2009 The new QSC AD-S28Tw surface mount subwoofer As the latest addition to the QSC Audio AcousticDesign (AD) Series, the model AD-S28Tw surface mount subwoofer is acoustically matched to all other offerings within the AD Series. The new AD-S28Tw is specified as having a continuous power handling capacity of 250 watts and capabilities for managing up to 700 watt peaks, the new subwoofer has a 70/100-volt multi-tap transformer with eight ohm bypass, frequency response of 42 Hz-165 Hz, and sensitivity of 94 dB (1W/1m). Two eight-inch woofers are outfitted with polypropylene cones for added protection in humid environments. The loudspeaker’s bandpass enclosure incorporates a pair of chambers – one that is completely sealed, and another with a large port. Giving added precision to low frequency extension down to 36 Hz, the highly efficient design is further complemented by an onboard low-pass filter set at 120 Hz. The enclosure offers marine-grade plywood construction, a zinc-plated steel grille with a black foam backing, molded ABS endcaps, and a rotatable logo, and it has also been fitted with a recessed rear input panel covered by a hinged door. Nickel-plated input and output terminals accept wiring ranging from 18 AWG to 12 AWG. One switch selects between the 70/100V transformer taps, while another enables or disables the passive low-pass filter. Attached rubber feet allow the device to be used on either the floor or a shelf. Forged-shoulder eyebolts, a steel yoke, and all related hardware are additionally included with each loudspeaker to offer options for suspended installation. QSC Audio Website Comments Have something to say about this PSW content? Leave a comment! Cancel reply Scroll past the ”Post Comment” button below to view any existing comments. Your email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed. Tagged with: Acoustics Audio Frequencies Hardware Loudspeakers Mounts New Passive Power Product Protection QSC Series Subwoofers System · all topics Subscribe to Live Sound International Subscribe to Live Sound International magazine. Stay up-to-date, get the latest pro audio news, products and resources each month with Live Sound. Subscribe Today!