The PS Series Concert speakers are Heavy Duty Professional Series Enclosures. Each is specified to give you the utmost in terms of design, power handling, clarity and efficiency. You will not find a better value on the market. The PS115HDT and PS215HDT trapezoidal enclosures feature a large format 90O x 40O CD Horn, loaded with an extended range 2" Titanium Driver. Heavy Duty Cast Frame 15" woofers offer superior low end response. Available in either single or dual 15" formats, these cabinets are formidable performers.