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The 21W/8555-10 is a mechanically upgraded version of 21W/8555-00, its major change is the a alu chassis, that maintain same shape, dimensions and visual appearance. The patented Symmetric Drive (SD-1) concept with copper in the magnet system and carbon f
The Scan-speak 23W/4557T is a high end subwoofer featuring a very rigid aluminum cone, low loss rubber surround and cast frame. The 23W/4557T uses the SD-1 motor system. There are gold plated binding posts and the woofer magnet is covered by a decorative
