Mackie introduced two new speakers HD1531 and HD1521, which enjoy powerful sound and HD sounding. New items allow forces of sound in 1800 and 1600 watts respectively and there are equipped with proprietary acoustic correction system using the phase correction and adjustment of the time signal. Acoustic systems have 15 inch neodymium woofer with 3 inch Voice Coil and 1.75-inch compression driver with heat-treated titanium diaphragm, heat treatment took place. In addition, they have branded the scheme helps the amplifier to recover quickly after aggressive short-term fluctuations.
http://www.gadgetfolder.com/mackie-hd1531-and-hd1521-speaker-systems-for-acoustic-systems.html
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