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 QSC Audio Website Comments Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Tagged with: Acoustics Audio Frequencies Hardware Loudspeakers Mounts New New Products Passive Power 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.