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Driver file ready to place in Hornresp’s Drivers folder.
Download for HornrespDayton Audio ND91-4 4Ω
LF DriverMedia
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Overview
LF Driver
Dayton Audio
Dayton Audio ND91-4
Dayton Audio ND91-4 is a 2" 4 ohm LF driver rated at 30W RMS. The validated T/S data includes Fs 74Hz, Qts 0.41, Vas 1.4L, Xmax 4.6mm, sensitivity 83dB, plus 14cm³ Vd and 164 EBP. bits tracks UK vendor pricing, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £20.70.
Size
2"
Impedance
4Ω
RMS Power
30W
Sensitivity
83.0dB
85.6dBmanufacturer; using T/S-derived value (2.6dB delta).
EBP
164
Vented alignment
Vd
14cm³
Datasheet traces
Frequency and impedance curves traced from the manufacturer PDF.
15 degrees240 ptsp1medium
30 degrees220 ptsp1medium
45 degrees228 ptsp1medium
Curve provenanceInspect 4 tracesHide details
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v1
15 degrees
Frequency response
240 plotted pointsMedium confidence736 selected pixels of 895 - Trace datasheet-response-trace-poc/v1
30 degrees
Frequency response
220 plotted pointsMedium confidence473 selected pixels of 853 - Trace datasheet-response-trace-poc/v1
45 degrees
Frequency response
228 plotted pointsMedium confidence615 selected pixels of 1,130 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence1,360 selected pixels of 1,360
T/S Parameters
Valid
Fs74Hz
Qts0.41
Qes0.45
Qms4.2
Vas1.4L
Re4.3Ω
Le0.83mH
BL4.6Tm
Sd30cm²
Mms5g
Xmax4.6mm
SPL83dB
Power30W
Impedance4Ω
F Low65Hz
F High17000Hz
Pricing & availability
Price definitionsPrice movement
Other offers
1 vendorsoundimports
Updated 11 Sept 2026· 4Ω
Source: inc VAT
£29.17
inc VAT
Out of stock
Best current price
Updated 11 Sept 2026
partsexpress
£20.70
inc VAT·392 in stock
Use this driver
Open it in 00 Simulator, download it for your enclosure tool, or copy the specification values.
Files use canonical values. Required mechanical fields are derived only where the target format needs them.
WinISD
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Native WinISD driver record with the required SI conversions.
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.bastaelement · BASTA! loudspeaker simulator
Native BASTA! element file using its documented SI-unit fields.
Download for BASTA!VituixCAD
.wdr · VituixCAD 2 Enclosure
A WinISD driver file that VituixCAD imports directly.
Download for VituixCAD00 Simulator
Direct import · Web app
Start a new enclosure simulation with this driver already loaded.
Open in 00 SimulatorCopy spec sheet
Plain text · Clipboard
Copy the available values as a clean label-and-value list.
Dimensions & Physical
Weight0.3kg
Diameter103.5mm
Overall Depth63.4mm
Cutout Diameter85.0mm
Similar Drivers
Size stays fixed. Tune the T/S ranges to change what counts as a match, or add a specific driver to compare it directly.
Reference
Dayton Audio
ND91-4
2"
Best current price
£20.70
Compare on
Matches sit inside every range. Size stays fixed automatically.
5 active T/S params, plus size. Pin a driver to open a side-by-side comparison.
5 matches
Compare a specific driver
Added drivers stay at the front of the list, whatever the ranges say.
63%
Similarity
£20.70
Dayton Audio
ND91-8
2"
Xmax5.1mm+11%
Qts0.47+15%
BL5.6Tm+23%
Vas1.5L+9%
Qes0.53+18%
Image unavailable
59%
Similarity
Wavecor
SW084OM01
3"
Xmax4.5mm-2%
Qts0.44+7%
BL3.6Tm-22%
Vas1.7L+21%
Qes0.46+2%
50%
Similarity
Tang Band
W3-1876S
3"
Xmax4mm-13%
Qts0.43+5%
BL5.3Tm+15%
Vas0.9L-37%
Qes0.5+11%
50%
Similarity
Tang Band
W3-1876S
3"
Xmax4mm-13%
Qts0.43+5%
BL5.3Tm+15%
Vas0.9L-37%
Qes0.5+11%
32%
Similarity
Tang Band
W3-1401SD
3"
Xmax3.5mm-24%
Qts0.31-24%
BL5.6Tm+21%
Vas1.6L+18%
Qes0.38-16%