Quick Overview The Dayton Audio ND91-8 3-1/2" Neo-Balanced driver balances low distortion, extended range, and surprising bass impact. Its sophisticated motor design provides the underhung 1" voice coil with extended linear travel within the magnetic field. Product Highlights Low distortion, full-range 65 Hz to 17 kHz performance Rubber-edged black anodized aluminum alloy cone Large excursion capability ? 4.6 mm Xmax, 25 mm peak Self-shielded Neo-Balanced motor structure with copper alloy shorting ring 1" 4-layer underhung voice coil with polyimide former 30 watts RMS power handling Great for line arrays and micro monitors Product Manuals / Spec Sheets / Downloads Dayton Audio ND91-8 Specification Sheet Dayton Audio ND91-8 Klippel Test Results Dayton Audio ND91-8 Data Files AddThis Sharing Buttons Share to FacebookFacebook Share to TwitterTwitter Share to MoreAddThis Product Description Dayton Audios ND91 aluminum cone full-range drivers are the latest addition to the acclaimed ND Series high output/low distortion neodymium transducers. By increasing the original ND90s voice coil diameter from 3/4" to 1" and adding a copper alloy shorting ring, the ND91-8 features even lower distortion and delivers better bass impact and dynamic range?with peak Xmax up to 25 mm! This high-BL version further exploits the low distortion characteristics of the Neo-Balanced motors optimized magnetic field, making the ND91 drivers an excellent choice for full-range point-source speaker enclosures, as well as extremely accurate, high resolution line arrays. OPTIMUM CABINET SIZE * Sealed Volume 0.02 ft.³ Sealed F3 139 Hz Vented Volume 0.04 ft.³ Vented F3 75 Hz * Enclosure volume/F3s based on BassBox "optimum" calculations Product Details Speaker Series ND Series Model Number ND91-8 List Price $37.99 Color Black Unit of Measure Each UPC 844632090455 Warranty - Parts 5 Years Warranty - Labor 5 Years Product Shipping Weight (lbs.) 0.7 Speaker Type Full-Range Nominal Diameter 3.50" Power Handling (RMS) 30 watts Power Handling (max) 60 watts Continuous Program Power -- Impedance 8 ohms Sensitivity 82.1 dB @ 2.83V/1m Frequency Response 70 - 17 000 Hz Voice Coil Diameter 25 mm Magnet Weight -- DC Resistance (Re) 7.8 ohms Voice Coil Inductance (Le) 1.24 mH @ 1 kHz Resonant Frequency (Fs) 70.7 Hz Mechanical Q (Qms) 4.29 Electromagnetic Q (Qes) 0.53 Total Q (Qts) 0.47 Diaphragm Mass Inc. Airload (Mms) 4.8g Moving Mass Of Diaphragm (Mmd) -- Mechanical Compliance of Suspension (Cms) 1.05 mm/N Surface Area Of Cone (Sd) 30.4 cm² Volume of Displacement (Vd) 12.2 cm³ BL Product (BL) 5.63 Tm Compliance Equivalent Volume (Vas) 1.53 liters Maximum Linear Excursion (Xmax) 5.1 mm Drivers Mechanical Losses (Rms) -- Cone / Diaphragm Material Aluminum Cone Entry / Exit Diameter -- Surround Material Rubber Voice Coil Wire Material Aluminum Voice Coil Former Kapton® / Polyimide Basket/Frame Material Steel Magnet Material Ferrite Overall Outside Diameter 103.5 mm Overall Depth 56.4 mm Baffle Cutout Diameter 85 mm # Mounting Holes 4 Mounting Hole Diameter -- Bolt Circle Diameter -- Product Weight --