SB AcousticsSB20PFCR30-8
£33.07 · 34% less, betterFs34 Hz +10%
Qts0.37 −5%
Vas66.2 L +73%, worse
BL7.7 T·m –
Xmax5.8 mm −4%
Sensitivity89.8 dB +3.7, better
8-inch LF driver · 80 W
Dayton Audio SD215A-88 8Ω
8 Ω · 31–2500 Hz
£50.20
SteadySoundImports · 1512 in stock · Ships from Netherlands · All 1 offer
- Fs
- 31Hz
- Xmax
- 6mm
- SPL
- 86dB
- Pe
- 80W
- BL
- 7.7T·m
- Vd
- 125cm³
- Qts
- 0.39
- Vas
- 38L
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 2 traces
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v1
on-axis
Frequency response
240 plotted pointsMedium confidence1,543 selected pixels of 1,543 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence1,282 selected pixels of 1,282
Dayton Audio SD215A-88 is an 8-inch 8 ohm LF driver rated at 80 W RMS. The validated T/S data includes Fs 31 Hz, Qts 0.39, Vas 38.2 L, Xmax 6 mm, sensitivity 86.1 dB, plus 125 cm³ Vd and 69 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 £50.20.
The published T/S values agree with each other
Thiele/Small
- Fs
- 31Hz
- Qts
- 0.39
- Qes
- 0.45
- Qms
- 3.1
- Vas
- 38.2L
- Re
- 3.2Ω
- Le
- 1.16mH
Motor and cone
- BL
- 7.7T·m
- Sd
- 209cm²
- Mms
- 42g
- Xmax
- 6mm
- Vd †
- 125cm³
Power and response
- Sensitivity †
- 86.1dB
- Manufacturer sensitivity
- 85.9dB
- Power
- 80W
- Impedance
- 8Ω
- Range
- 31–2500Hz
- EBP †
- 69 · Sealed or vented
Size and mounting
- Diameter
- 216mm
- Cutout
- 180mm
- Depth
- 95mm
Other published values
- Cms
- 0.62mm/N
- Power Peak
- 160
† Calculated by bits from the published values
What this validation status means
Everything else Dayton Audio lists
LF · Primary · 8″
- BL
- 7.7T·m
- Fs
- 31Hz
- Le
- 1.16mH
- Re
- 3.2Ω
- Sd
- 209cm²
- Cms
- 0.62mm/N
- Mms
- 42g
- Qes
- 0.45
- Qms
- 3.1
- Qts
- 0.39
- SPL
- 86.1dB
- Vas
- 38.2L
- Xmax
- 6mm
- Power
- 80W
- Impedance
- 8Ω
- Power Peak
- 160
- Sensitivity
- 85.9dB
- Low limit
- 31Hz
- Calculated sensitivity †
- 86.1dB
- High limit
- 2500Hz
- Manufacturer sensitivity
- 85.9dB
- Diameter
- 216mm
- Depth
- 95mm
- Cutout
- 180mm
02
Compare
Same-size drivers, compared with the SD215A-88. Clear differences are green when better and red when worse.
This driverSD215A-88
Best price
£50.20
Fs
31 Hz
Qts
0.39
Vas
38.2 L
BL
7.7 T·m
Xmax
6 mm
Sensitivity
86.1 dB
Power
80 W
SB AcousticsSB20PFC30-8
£35.17 · 30% less, betterFs34 Hz +10%
Qts0.37 −5%
Vas66.2 L +73%, worse
BL7.7 T·m –
Xmax5.7 mm −6%
Sensitivity89.8 dB +3.7, better
Dayton AudioDA215-8
£41.88 · 17% less, betterFs35 Hz +13%, worse
Qts0.37 −5%
Vas42.7 L +12%, worse
BL10 T·m +30%, better
Xmax5.3 mm −12%, worse
Sensitivity88.1 dB +2, better
HiViF8
£52.71 · 5% more, worseFs37 Hz +19%, worse
Qts0.40 –
Vas38.8 L –
BL10.3 T·m +34%, better
Xmax5 mm −17%, worse
Sensitivity88.5 dB +2.4, better
Dayton AudioRS180P-8
£59.83 · 19% more, worseFs46 Hz +48%, worse
Qts0.34 −13%, better
Vas22 L −42%, better
BL7.2 T·m −7%
Xmax6 mm –
Sensitivity88.8 dB +2.7, better
Dayton AudioRS180-8
£59.83 · 19% more, worseFs36 Hz +15%, worse
Qts0.31 −21%, better
Vas24.4 L −36%, better
BL7.8 T·m –
Xmax6 mm –
Sensitivity86.3 dB –
Dayton AudioRS180P-4
£59.83 · 19% more, worseFs38 Hz +22%, worse
Qts0.39 –
Vas27.3 L −29%, better
BL4.7 T·m −39%, worse
Xmax6 mm –
Sensitivity86.9 dB +0.8
REDCATT8FR
£66.10 · 32% more, worseFs53 Hz +71%, worse
Qts0.38 −3%
Vas36.8 L −4%
BL7.9 T·m –
Xmax5.8 mm −3%
Sensitivity93.4 dB +7.3, better
Dayton AudioRS225P-4A
£67.31 · 34% more, worseFs38 Hz +22%, worse
Qts0.38 –
Vas45.8 L +20%, worse
BL6.4 T·m −17%, worse
Xmax6 mm –
Sensitivity89.1 dB +3, better
Dayton AudioRS225-4
£67.31 · 34% more, worseFs33 Hz +6%
Qts0.41 +5%
Vas46.4 L +21%, worse
BL6.4 T·m −17%, worse
Xmax6 mm –
Sensitivity87.1 dB +1
HiViE8
£71.05 · 42% more, worseFs34 Hz +10%
Qts0.37 −5%
Vas49.8 L +30%, worse
BL9.9 T·m +29%, better
Xmax5.9 mm –
Sensitivity88.6 dB +2.5, better
Dayton AudioRS180S-8
£78.62 · 57% more, worseFs38 Hz +22%, worse
Qts0.36 −8%
Vas23 L −40%, better
BL7.3 T·m −5%
Xmax6 mm –
Sensitivity86 dB –
REDCATT8FHM
£83.69 · 67% more, worseFs38 Hz +23%, worse
Qts0.39 –
Vas32.1 L −16%, better
BL8.2 T·m +6%
Xmax5 mm −17%, worse
Sensitivity88.4 dB +2.3, better
SB AcousticsSB23NRXS45-8
£84.41 · 68% more, worseFs27 Hz −13%, better
Qts0.38 –
Vas94 L +146%, worse
BL7.5 T·m –
Xmax6.5 mm +8%
Sensitivity88.6 dB +2.5, better
Scanspeak22W/8534G00
£85.75 · 71% more, worseFs30 Hz −3%
Qts0.39 –
Vas94.2 L +147%, worse
BL7.8 T·m –
Xmax5.8 mm −3%
Sensitivity89.7 dB +3.6, better
SB AcousticsSB23NBACS45-8
£97.88 · 95% more, worseFs25 Hz −19%, better
Qts0.40 –
Vas93.4 L +145%, worse
BL7.9 T·m –
Xmax6.5 mm +8%
Sensitivity87.3 dB +1.2
MonacorSPH-220HQ
£104.66 · 109% more, worseFs30 Hz −3%
Qts0.40 –
Vas80 L +109%, worse
BL7.6 T·m –
Xmax5.5 mm −8%
Sensitivity88.7 dB +2.6, better
SB AcousticsSB23CACS45-8
£114.02 · 127% more, worseFs25 Hz −19%, better
Qts0.40 –
Vas87 L +128%, worse
BL7.9 T·m –
Xmax6.5 mm +8%
Sensitivity86.9 dB +0.8
WavecorWF182BD12
£118.19 · 135% more, worseFs30 Hz −5%
Qts0.37 −5%
Vas32.4 L −15%, better
BL8.2 T·m +6%
Xmax5.5 mm −8%
Sensitivity85.4 dB −0.7
Scanspeak18W/8542-10
£157.04 · 213% more, worseFs43 Hz +39%, worse
Qts0.35 −10%, better
Vas26 L −32%, better
BL6.9 T·m −10%, worse
Xmax6.5 mm +8%
Sensitivity88.7 dB +2.6, better
ETON8-512/C8/32 HEX
£184.17 · 267% more, worseFs27 Hz −13%, better
Qts0.40 –
Vas102 L +167%, worse
BL7.8 T·m –
Xmax5.5 mm −8%
Sensitivity88.7 dB +2.6, better
WavecorWF182BD20
£188.39 · 275% more, worseFs30 Hz −5%
Qts0.37 −5%
Vas32.4 L −15%, better
BL8.2 T·m +6%
Xmax5.5 mm −8%
Sensitivity85.4 dB −0.7
WavecorWF223BD01
£205.39 · 309% more, worseFs33 Hz +5%
Qts0.39 –
Vas45 L +18%, worse
BL7.7 T·m –
Xmax6.5 mm +8%
Sensitivity87.9 dB +1.8
Scanspeak18WU/8747T00
£284.64 · 467% more, worseFs36 Hz +16%, worse
Qts0.38 –
Vas36.2 L −5%
BL7.4 T·m −4%
Xmax9 mm +50%, better
Sensitivity88 dB +1.9
Scanspeak18WU/8741T00
£300.68 · 499% more, worseFs35 Hz +13%, worse
Qts0.39 –
Vas37.1 L –
BL7.3 T·m −5%
Xmax9 mm +50%, better
Sensitivity87.6 dB +1.5
WavecorWF182BD11
No current priceFs34 Hz +10%
Qts0.42 +8%
Vas24.3 L −36%, better
BL8.2 T·m +6%
Xmax5.5 mm −8%
Sensitivity85.4 dB −0.7
WavecorWF182BD19
No current priceFs34 Hz +10%
Qts0.42 +8%
Vas24.3 L −36%, better
BL8.2 T·m +6%
Xmax5.5 mm −8%
Sensitivity85.4 dB −0.7
CIARECW202
No current priceFs40 Hz +29%, worse
Qts0.41 +5%
Vas48 L +26%, worse
BL6.5 T·m −15%, worse
Xmax6.5 mm +8%
Sensitivity90.1 dB +4, better
KartesianSUB185_VKI
No current priceFs28 Hz −10%
Qts0.41 +5%
Vas38.6 L –
BL6.9 T·m −10%, worse
Xmax15 mm +150%, better
Sensitivity84.8 dB −1.3
Eighteen Sound8MB400
No current priceFs64 Hz +106%, worse
Qts0.38 –
Vas23.9 L −37%, better
BL9.3 T·m +21%, better
Xmax5.8 mm −3%
Sensitivity93.7 dB +7.6, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.6 out of 522 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 |
|---|---|---|---|---|
SoundImports Import VAT and duty may apply | £50.20, the lowest price | 1512 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr