STS 50 Two-Way Bookshelf (400-0230) Features Faxback Doc. # 14033 Speaker Your Optimus STS 50 Two-Way Bookshelf Speaker gives you outstanding music reproduction in a small enclosure. Space-Saving Design - lets you install your speaker in a bookshelf or other small space. 5-Inch High-Compliance Woofer - gives you excellent bass sound. 2 1/2-Inch Extended Range Tweeter - gives you a clear, clean, high- frequency sound. (ALL-03/14/95)