Dayton Audio's 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 ND90's 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 motor's 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.
Power Handling (RMS)30 Watts
Power Handling (max)60 Watts
Frequency Response70 to 17,000 Hz
Sensitivity82.1 dB 2.83V/1m
Voice Coil Diameter1"
Resonant Frequency (Fs)70.7 Hz
DC Resistance (Re)7.8 ohms
Voice Coil Inductance (Le)1.24 mH
Mechanical Q (Qms)4.29
Electromagnetic Q (Qes)0.53
Total Q (Qts)0.47
Compliance Equivalent Volume (Vas)0.05 ft.³
Mechanical Compliance of Suspension (Cms)1.05 mm/N
BL Product (BL)5.63 Tm
Diaphragm Mass Inc. Airload (Mms)4.8g
Maximum Linear Excursion (Xmax)5.1 mm
Surface Area of Cone (Sd)30.4 cm²
Materials of Construction
Voice Coil Wire MaterialAluminum
Voice Coil FormerKapton® / Polyimide
Basket / Frame MaterialSteel
Overall Outside Diameter3.35"
Baffle Cutout Diameter3.01"
Bolt Circle Diameter3.66"
# Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)