The Dayton Audio ND91-8 3-1/2" Neo-Balanced full-range 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. When teamed up with the matching ND series passive radiators this driver can produce incredible full sound from compact enclosures.
Key Features
Low distortion, full-range 65 Hz to 17 kHz performance
Rubber-edged black anodized aluminum alloy cone
Large excursion capability—5.1 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
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.
Product Specifications
Nominal Diameter 3-1/2"
Bolt Circle Diameter 3.66
Moving Mass Of Diaphragm (Mmd) 4.8
Power Handling (RMS) 30 Watts
Power Handling (MAX) 60 Watts
Impedance 8Ω
Frequency Response 70 to 17,000Hz
Sensitivity 82.1dB 2.83V/1m
Voice Coil Diameter 1"
Thiele-Small Parameters
Resonant Frequency (Fs) 70.7Hz
DC Resistance (Re) 7.8Ω
Voice Coil Inductance (Le) 1.24mH
Mechanical Q (Qms) 4.29
Electromagnetic Q (Qes) 0.53
Total Q (Qts) 0.47
Compliance Equivalent Volume (Vas) 0.05ft³
Mechanical Compliance of Suspension (Cms) 1.05mm/N
BL Product (BL) 5.63T·m
Maximum Linear Excursion (Xmax) 5.1mm
Surface Area of Cone (Sd) 30.4cm²
Materials of Construction
Cone Material Aluminum
Surround Material Rubber
Voice Coil Wire Material Aluminum
Voice Coil Former Kapton® / Polyimide
Basket / Frame Material Steel
Magnet Material Neodymium
Mounting Information
Overall Outside Diameter 3.35"
Baffle Cutout Diameter 3.01"
Depth 2.22"
# Mounting Holes 4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
Sealed Volume 0.02ft³
Sealed F3 139Hz
Vented Volume 0.04ft³
Vented F3 75Hz