Brand NEW! Including 90 Days USA Factory Warranty. The Dayton Audio Designer Series passive radiators are excellent general-purpose passives suitable for replacement or for new construction. Built to be a perfect match for the Designer Series drivers, these passive radiators feature the same steel frame, rubber surround, and anodized aluminum cone making them visually identical. Key Features ? Perfect match for Dayton Audio's aluminum cone Designer Series drivers ? Allows tuning small enclosures lower than using conventional ports ? Rear mounted screw allows easy mass adjustment for custom tuning ? Cosmetic frame edge looks great even when surface mounted. The Dayton Audio Designer Series passive radiators are excellent general-purpose passives suitable for replacement or for new construction. A built-in mass disc offers a good starting point for most designs, and a convenient M5 threaded hole (screw included) allows different types of weights to be added if desired. Cosmetically and mechanically, these passives match Dayton Audio's Designer Series drives, with a black anodized aluminum cone and medium-roll rubber surround for clean excursion and long life. The possibilities with these passives are endless, from full size tower designs to compact subwoofer systems. Specifications: ? Fs: 21.9 Hz ? Vas: 3.74 ft ? Qms: 5.26 ? Cms: 0.60 mm/N ? Rms: 2.3 kg/s ? Mms: 88.4 g ? Sd: 353 sq. cm. ? Xmax: 11 mm ? Dimensions: Overall diameter: 10.63", Cutout diameter: 8.94", Depth: 2.87". Note: Adding mass to the passive radiator will decrease Fs and increase Qms. Tip: As a general rule, the passive radiator(s) should have at least double the displacement of air (Vd) as the active woofer(s)/subwoofer(s) in the system. To calculate Vd: Sd x Xmax = Vd Product Specifications Nominal Diameter 10" Bolt Circle Diameter 8.11 Moving Mass Of Diaphragm (Mmd) 88.4 Thiele-Small Parameters Resonant Frequency (Fs) 21.9Hz Mechanical Q (Qms) 5.26 Compliance Equivalent Volume (Vas) 3.74ft Mechanical Compliance of Suspension (Cms) 0.6mm/N Maximum Linear Excursion (Xmax) 11mm Surface Area of Cone (Sd) 353cm Materials of Construction Cone Material Aluminum Surround Material Rubber Basket / Frame Material Steel Mounting Information Overall Outside Diameter 10.63" Baffle Cutout Diameter 8.94" Depth 2.87" # Mounting Holes 5 - All international buyers are responsible for all tax, duties and/or customs fees.