Dayton AudioDS90-8
£16.44 · 21% less, betterFs81 Hz +10%, worse
Qts0.43 +5%
Vas1.3 L −6%
BL4.8 T·m +4%
Xmax2.5 mm −46%, worse
Sensitivity83.3 dB –
3.5-inch LF driver · 30 W
Dayton Audio ND91-4 4Ω
4 Ω · 65–17000 Hz
£20.93
Steady19% below the average of 3 shops
Parts Express · 106 in stock · Ships from United States · All 5 offers
- Fs
- 74Hz
- Xmax
- 4.6mm
- SPL
- 83dB
- Pe
- 30W
- BL
- 4.6T·m
- Vd
- 14cm³
- Qts
- 0.41
- Vas
- 1L
Manufacturer response and impedance data, with source and trace details below. The left and right arrow keys read every shown curve at a frequency, a twelfth of an octave at a time, or an octave with Shift. Escape clears the reading.
Curve provenanceInspect 4 traces
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
Dayton Audio ND91-4 is a 3.5-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 74 Hz, Qts 0.41, Vas 1.4 L, Xmax 4.6 mm, sensitivity 83 dB, plus 14 cm³ Vd and 164 EBP. bits tracks UK, EU and US shop prices, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £20.93.
The published T/S values agree with each other
Thiele/Small
- Fs
- 74Hz
- Qts
- 0.41
- Qes
- 0.45
- Qms
- 4.2
- Vas
- 1.4L
- Re
- 4.3Ω
- Le
- 0.83mH
Motor and cone
- BL
- 4.6T·m
- Sd
- 30cm²
- Mms
- 5g
- Xmax
- 4.6mm
- Vd †
- 14cm³
Power and response
- Sensitivity †
- 83dB
- Manufacturer sensitivity
- 85.6dB
- Power
- 30W
- Impedance
- 4Ω
- Range
- 65–17000Hz
- EBP †
- 164 · Leans vented
Size and mounting
- Diameter
- 103.5mm
- Cutout
- 85mm
- Depth
- 63.4mm
- Weight
- 0.32kg
Other published values
- Cms
- 0.96mm/N
- Power Peak
- 60
Sensitivity shows 83.0 dB, calculated from the T/S values. Dayton Audio publishes 85.6 dB, 2.6 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Dayton Audio lists
LF · Primary · 3.5″
- BL
- 4.6T·m
- Fs
- 74Hz
- Le
- 0.83mH
- Re
- 4.3Ω
- Sd
- 30cm²
- Cms
- 0.96mm/N
- Mms
- 5g
- Qes
- 0.45
- Qms
- 4.2
- Qts
- 0.41
- SPL
- 83dB
- Vas
- 1.4L
- Xmax
- 4.6mm
- Power
- 30W
- Impedance
- 4Ω
- Power Peak
- 60
- Sensitivity
- 85.6dB
- Low limit
- 65Hz
- Calculated sensitivity †
- 83dB
- High limit
- 17000Hz
- Manufacturer sensitivity
- 85.6dB
- Weight
- 0.32kg
- Diameter
- 103.5mm
- Depth
- 63.4mm
- Cutout
- 85mm
02
Compare
Same-size drivers, compared with the ND91-4. Clear differences are green when better and red when worse.
This driverND91-4
Best price
£20.93
Fs
74 Hz
Qts
0.41
Vas
1.4 L
BL
4.6 T·m
Xmax
4.6 mm
Sensitivity
83 dB
Power
30 W
Dayton AudioND91-8
£20.93 · Same priceFs71 Hz −4%
Qts0.47 +15%, worse
Vas1.5 L +9%
BL5.6 T·m +23%, better
Xmax5.1 mm +11%, better
Sensitivity82.1 dB −0.9
Sica4 E 1 CS
£23.86 · 14% more, worseFs118 Hz +59%, worse
Qts0.39 −5%
Vas1.3 L −7%
BL5.8 T·m +25%, better
Xmax2.2 mm −52%, worse
Sensitivity88.4 dB +5.4, better
PeerlessSLS-85S25CP04-04
£25.08 · 20% more, worseFs73 Hz –
Qts0.36 −12%, better
Vas1.4 L –
BL4.3 T·m −6%
Xmax6.5 mm +41%, better
Sensitivity83.6 dB +0.6
Tang BandW3-881SJF
£30.14 · 44% more, worseFs100 Hz +35%, worse
Qts0.39 −5%
Vas1.9 L +35%, worse
BL4.5 T·m –
Xmax0.5 mm −89%, worse
Sensitivity88.7 dB +5.7, better
LavoceFSN030.72
£30.67 · 47% more, worseFs127 Hz +72%, worse
Qts0.41 –
Vas1.1 L −20%, better
BL5.0 T·m +9%
Xmax2.1 mm −54%, worse
Sensitivity89.3 dB +6.3, better
SB AcousticsSB12NRXF25-8
£45.28 · 116% more, worseFs63 Hz −15%, better
Qts0.42 –
Vas4.2 L +200%, worse
BL5.5 T·m +20%, better
Xmax5 mm +9%
Sensitivity85.6 dB +2.6, better
Tang BandW3-1231SN
£46.05 · 120% more, worseFs100 Hz +35%, worse
Qts0.34 −17%, better
Vas1.4 L –
BL4.4 T·m −4%
Xmax1.3 mm −73%, worse
Sensitivity87.2 dB +4.2, better
SB AcousticsSB12NRX25-4
£46.34 · 121% more, worseFs55 Hz −26%, better
Qts0.40 –
Vas5.6 L +300%, worse
BL3.6 T·m −22%, worse
Xmax5 mm +9%
Sensitivity85.1 dB +2.1, better
WavecorWF118WA08
£47.13 · 125% more, worseFs58 Hz −22%, better
Qts0.42 –
Vas4.9 L +250%, worse
BL5.8 T·m +26%, better
Xmax4 mm −13%, worse
Sensitivity85.3 dB +2.3, better
MonacorSPH-30X/8SW
£57.31 · 174% more, worseFs105 Hz +42%, worse
Qts0.42 –
Vas1.3 L −7%
BL4.5 T·m –
Xmax2 mm −57%, worse
Sensitivity86.9 dB +3.9, better
Tang BandW3-1335SB
£61.96 · 196% more, worseFs100 Hz +35%, worse
Qts0.34 −17%, better
Vas1.2 L −13%, better
BL5.2 T·m +12%, better
Xmax0.5 mm −89%, worse
Sensitivity86.3 dB +3.3, better
WavecorWF120BD05
£81.54 · 290% more, worseFs52 Hz −30%, better
Qts0.43 +5%
Vas5.3 L +279%, worse
BL4.1 T·m −11%, worse
Xmax4 mm −13%, worse
Sensitivity84.2 dB +1.2
Tang BandW4-1720
£82.28 · 293% more, worseFs60 Hz −19%, better
Qts0.42 –
Vas5.9 L +323%, worse
BL3.8 T·m −17%, worse
Xmax5 mm +9%
Sensitivity86 dB +3, better
WavecorSW118WA01
£84.74 · 305% more, worseFs58 Hz −22%, better
Qts0.39 −5%
Vas3.3 L +136%, worse
BL4.7 T·m –
Xmax4 mm −13%, worse
Sensitivity84 dB +1
WavecorWF120BD03
£120.66 · 476% more, worseFs70 Hz −5%
Qts0.42 –
Vas3.3 L +132%, worse
BL4.5 T·m –
Xmax4 mm −13%, worse
Sensitivity85.9 dB +2.9, better
MorelTIW 634FT
£152.39 · 628% more, worseFs40 Hz −46%, better
Qts0.39 −5%
Vas19.7 L +1307%, worse
BL5.6 T·m +22%, better
Xmax4.3 mm −8%
Sensitivity86.7 dB +3.7, better
VisatonTI 100
£154.93 · 640% more, worseFs62 Hz −16%, better
Qts0.41 –
Vas5.7 L +306%, worse
BL5.0 T·m +8%
Xmax2.3 mm −51%, worse
Sensitivity86.9 dB +3.9, better
Tang BandW4-1879
£209.33 · 900% more, worseFs55 Hz −26%, better
Qts0.43 +5%
Vas9.1 L +551%, worse
BL4.2 T·m −9%
Xmax5 mm +9%
Sensitivity86.8 dB +3.8, better
CIARENDI3.25
No current priceFs77 Hz +4%
Qts0.40 –
Vas1.7 L +21%, worse
BL4.2 T·m −8%
Xmax3.9 mm −15%, worse
Sensitivity84.1 dB +1.1
WavecorSW084OM01
No current priceFs74 Hz –
Qts0.44 +7%
Vas1.7 L +21%, worse
BL3.6 T·m −22%, worse
Xmax4.5 mm –
Sensitivity83.8 dB +0.8
CIARECX102
No current priceFs125 Hz +69%, worse
Qts0.43 +5%
Vas1.5 L +7%
BL4.3 T·m −7%
Xmax1.9 mm −59%, worse
Sensitivity89.6 dB +6.6, better
Dayton AudioDMA80-4
No current priceFs94 Hz +26%, worse
Qts0.41 –
Vas1.4 L –
BL3.7 T·m −19%, worse
Xmax2.5 mm −46%, worse
Sensitivity85.6 dB +2.6, better
Tang BandW3-1876S
No current priceFs55 Hz −26%, better
Qts0.43 +5%
Vas0.9 L −37%, better
BL5.3 T·m +15%, better
Xmax4 mm −13%, worse
Sensitivity76.7 dB −6.3, worse
WavecorWF120BD06
No current priceFs48 Hz −35%, better
Qts0.40 –
Vas6.2 L +343%, worse
BL4.1 T·m −11%, worse
Xmax4 mm −13%, worse
Sensitivity84.2 dB +1.2
Tang BandW4-1129E
No current priceFs120 Hz +62%, worse
Qts0.44 +7%
Vas1.7 L +23%, worse
BL5.2 T·m +13%, better
Xmax1.8 mm −61%, worse
Sensitivity90.1 dB +7.1, better
WavecorSW084OM02
No current priceFs77 Hz +4%
Qts0.53 +29%, worse
Vas1.7 L +21%, worse
BL4.6 T·m –
Xmax4.5 mm –
Sensitivity83.4 dB –
WavecorWF120BD04
No current priceFs62 Hz −17%, better
Qts0.37 −10%
Vas4.3 L +204%, worse
BL4.5 T·m –
Xmax4 mm −13%, worse
Sensitivity86 dB +3, better
Tang BandW3-1797S
No current priceFs90 Hz +22%, worse
Qts0.35 −15%, better
Vas1.0 L −31%, better
BL4.6 T·m –
Xmax1 mm −78%, worse
Sensitivity84.1 dB +1.1
CIARENDI3.21
No current priceFs90 Hz +22%, worse
Qts0.38 −7%
Vas1.8 L +29%, worse
BL4 T·m −13%, worse
Xmax2 mm −57%, worse
Sensitivity86.8 dB +3.8, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express4.7 out of 540 ratings · Checked 26 Oct 2026Read reviews on Parts Express
- SoundImports5.0 out of 516 ratings · Checked 26 Oct 2026Read reviews on SoundImports
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Parts Express Import VAT and duty may apply | £20.93, the lowest price | 106 in stock | Visit shop at Parts Express | |
SoundImports Import VAT and duty may apply | £28.43 | 36% above the lowest price | Back order | Visit shop at SoundImports |
RumoH Import VAT and duty may apply | £28.43 | 36% above the lowest price | Stock not listed | Visit shop at RumoH |
Audiophonics Import VAT and duty may apply | £28.64 | 37% above the lowest price | In stock | Visit shop at Audiophonics |
Best price over time
Tracked since 1 Apr