SB AcousticsSB20PFCR30-8
£33.48 · 12% less, betterFs34 Hz −14%, better
Qts0.37 −18%, better
Vas66.2 L –
BL7.7 T·m +8%
Xmax11.5 mm +180%, better
Sensitivity89.8 dB −1.6
8-inch LF driver · SB20 series · 31 mm voice coil · 40 W
SB Acoustics SB20FRPC30-8 8Ω
8 Ω
£42.28
SteadyLean Business · All 7 offers
- Fs
- 39Hz
- Xmax
- 4.1mm
- SPL
- 91dB
- Pe
- 40W
- BL
- 7.2T·m
- Vd
- 89cm³
- Qts
- 0.45
- Vas
- 66L
Published graphs
SB Acoustics SB20FRPC30-8 is an 8-inch 8 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 39 Hz, Qts 0.45, Vas 66.3 L, Xmax 4.1 mm, sensitivity 91.4 dB, plus 89 cm³ Vd and 84 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 £38.13.
The published T/S values agree with each other
Thiele/Small
- Fs
- 39Hz
- Qts
- 0.45
- Qes
- 0.47
- Qms
- 10.1
- Vas
- 66.3L
- Re
- 6Ω
- Le
- 0.22mH
Motor and cone
- BL
- 7.2T·m
- Sd
- 216cm²
- Mms
- 16g
- Xmax
- 4.1mm
- Vd †
- 89cm³
- Voice coil
- 31mm
- Flux density
- 1.20T
Power and response
- Sensitivity †
- 91.4dB
- Manufacturer sensitivity
- 92dB
- Power
- 40W
- Impedance
- 8Ω
- EBP †
- 84 · Sealed or vented
Size and mounting
- Weight
- 1.4kg
Other published values
- Cms
- 1mm/N
† Calculated by bits from the published values
What this validation status means
Everything else SB Acoustics lists
LF · Primary · 8″
- BL
- 7.2T·m
- Fs
- 39Hz
- Le
- 0.22mH
- Re
- 6Ω
- Sd
- 216cm²
- Cms
- 1mm/N
- Mms
- 16g
- Qes
- 0.47
- Qms
- 10.1
- Qts
- 0.45
- SPL
- 91.4dB
- Vas
- 66.3L
- Xmax
- 4.1mm
- Power
- 40W
- Impedance
- 8Ω
- Flux density
- 1.20T
- Sensitivity
- 92dB
- Calculated sensitivity †
- 91.4dB
- Manufacturer sensitivity
- 92dB
- Voice coil
- 31mm
- Weight
- 1.4kg
02
Compare
Same-size drivers, compared with the SB20FRPC30-8. Clear differences are green when better and red when worse.
This driverSB20FRPC30-8
Best price
£38.13
Fs
39 Hz
Qts
0.45
Vas
66.3 L
BL
7.2 T·m
Xmax
4.1 mm
Sensitivity
91.4 dB
Power
40 W
SB AcousticsSB20PFC30-8
£35.60 · 7% less, betterFs34 Hz −14%, better
Qts0.37 −18%, better
Vas66.2 L –
BL7.7 T·m +8%
Xmax5.7 mm +38%, better
Sensitivity89.8 dB −1.6
Dayton AudioDC200-8
£36.36 · 5% lessFs30 Hz −23%, better
Qts0.42 −7%
Vas45.7 L −31%, better
BL9.5 T·m +33%, better
Xmax4.5 mm +10%
Sensitivity86.2 dB −5.2, worse
PRV Audio8MR500-4
£37.75 · Same priceFs78 Hz +98%, worse
Qts0.46 –
Vas20.8 L −69%, better
BL6.5 T·m −10%
Xmax3.3 mm −21%, worse
Sensitivity95.2 dB +3.8, better
Dayton AudioMB820-8
£37.81 · Same priceFs69 Hz +75%, worse
Qts0.46 –
Vas15.8 L −76%, better
BL9.6 T·m +34%, better
Xmax4 mm –
Sensitivity92 dB +0.6
CIAREHW202
£50.01 · 31% more, worseFs30 Hz −24%, better
Qts0.44 –
Vas83 L +25%, worse
BL6.7 T·m −6%
Xmax6.5 mm +59%, better
Sensitivity88.4 dB −3, worse
Beyma8BR40
£54.18 · 42% more, worseFs30 Hz −24%, better
Qts0.39 −13%, better
Vas89.1 L +34%, worse
BL6.8 T·m −5%
Xmax6.7 mm +63%, better
Sensitivity89 dB −2.4, worse
Scanspeak18W/8434G00
£57.57 · 51% more, worseFs50 Hz +27%, worse
Qts0.43 −4%
Vas19.5 L −71%, better
BL7.2 T·m –
Xmax4.2 mm –
Sensitivity89.3 dB −2.1, worse
CIAREHW203
£59.33 · 56% more, worseFs39 Hz –
Qts0.42 −7%
Vas48.9 L −26%, better
BL8.1 T·m +14%, better
Xmax4.5 mm +10%
Sensitivity89.8 dB −1.6
CIAREHW172
£63.57 · 67% more, worseFs46 Hz +17%, worse
Qts0.37 −18%, better
Vas20 L −70%, better
BL7.6 T·m +6%
Xmax4.5 mm +10%
Sensitivity88.4 dB −3, worse
MonacorSPH-220HQ
£105.95 · 178% more, worseFs30 Hz −24%, better
Qts0.40 −11%, better
Vas80 L +21%, worse
BL7.6 T·m +7%
Xmax5.5 mm +34%, better
Sensitivity88.7 dB −2.7, worse
SB AcousticsSB23CACS45-8
£114.02 · 199% more, worseFs25 Hz −37%, better
Qts0.40 −11%, better
Vas87 L +31%, worse
BL7.9 T·m +10%, better
Xmax13 mm +217%, better
Sensitivity86.9 dB −4.5, worse
VisatonTIW 200 XS
£143.61 · 277% more, worseFs30 Hz −24%, better
Qts0.46 –
Vas51.5 L −22%, better
BL8.5 T·m +19%, better
Xmax12.5 mm +205%, better
Sensitivity86.5 dB −4.9, worse
Scanspeak18W/8535-01
£145.25 · 281% more, worseFs25 Hz −37%, better
Qts0.38 −16%, better
Vas68.9 L +4%
BL5.9 T·m −17%, worse
Xmax5 mm +22%, better
Sensitivity85.7 dB −5.7, worse
VisatonTIW 200 XS - 8 OHM
£148.29 · 289% more, worseFs30 Hz −24%, better
Qts0.46 –
Vas51.5 L −22%, better
BL8.5 T·m +19%, better
Xmax12.5 mm +205%, better
Sensitivity86.5 dB −4.9, worse
Dayton AudioPM220-8
£151.72 · 298% more, worseFs49 Hz +25%, worse
Qts0.38 −16%, better
Vas63 L −5%
BL7.2 T·m –
Xmax4.6 mm +12%, better
Sensitivity94.6 dB +3.2, better
Tang BandW8-2145
£152.53 · 300% more, worseFs40 Hz –
Qts0.45 –
Vas67.7 L –
BL6.6 T·m −8%
Xmax3 mm −27%, worse
Sensitivity90.5 dB −0.9
WavecorSW182BD03
£163.16 · 328% more, worseFs35 Hz −11%, better
Qts0.44 –
Vas12.7 L −81%, better
BL7.6 T·m +6%
Xmax7 mm +71%, better
Sensitivity82.9 dB −8.5, worse
SB AcousticsWO24P-4
£198.34 · 420% more, worseFs28 Hz −29%, better
Qts0.40 −11%, better
Vas71 L +7%
BL7.6 T·m +6%
Xmax17 mm +315%, better
Sensitivity87.7 dB −3.7, worse
Tang BandW8-2314
£296.62 · 678% more, worseFs38 Hz −4%
Qts0.46 –
Vas49.5 L −25%, better
BL6.1 T·m −15%, worse
Xmax6 mm +46%, better
Sensitivity89 dB −2.4, worse
Tang BandW8-750C
No current priceFs30 Hz −24%, better
Qts0.43 −4%
Vas57.0 L −14%, better
BL8.4 T·m +17%, better
Xmax3.9 mm −5%
Sensitivity86.9 dB −4.5, worse
HiViS8-98R
No current priceFs33 Hz −16%, better
Qts0.42 −7%
Vas65.2 L –
BL6.9 T·m −3%
Xmax6 mm +46%, better
Sensitivity89 dB −2.4, worse
HiViS8.8N
No current priceFs32 Hz −19%, better
Qts0.41 −9%
Vas85.3 L +29%, worse
BL8 T·m +12%, better
Xmax4.3 mm +5%
Sensitivity90 dB −1.4
HiViS8-98
No current priceFs34 Hz −14%, better
Qts0.44 –
Vas64.9 L –
BL6.6 T·m −8%
Xmax5.8 mm +41%, better
Sensitivity88.9 dB −2.5, worse
MarkaudioMA200-P MICA
No current priceFs39 Hz –
Qts0.37 −17%, better
Vas66.5 L –
BL7.0 T·m –
Xmax7 mm +71%, better
Sensitivity91.5 dB –
Supravox215 RTF 64 BI-CÔNE
No current priceFs57 Hz +45%, worse
Qts0.46 –
Vas80 L +21%, worse
BL6.5 T·m −9%
Xmax2.3 mm −44%, worse
Sensitivity96.5 dB +5.1, better
CIARECME201
No current priceFs60 Hz +52%, worse
Qts0.40 −11%, better
Vas21.5 L −68%, better
BL7.5 T·m +5%
Xmax4.5 mm +10%
Sensitivity92.3 dB +0.9
CIARECW202
No current priceFs40 Hz –
Qts0.41 −9%
Vas48 L −28%, better
BL6.5 T·m −9%
Xmax6.5 mm +59%, better
Sensitivity90.1 dB −1.3
CIARECM200N
No current priceFs94 Hz +139%, worse
Qts0.46 –
Vas8.8 L −87%, better
BL8.6 T·m +20%, better
Xmax3.8 mm −7%
Sensitivity93.5 dB +2.1, better
KartesianSUB185_VKI
No current priceFs28 Hz −29%, better
Qts0.41 −9%
Vas38.6 L −42%, better
BL6.9 T·m −3%
Xmax15 mm +266%, better
Sensitivity84.8 dB −6.6, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.8 out of 531 ratings · Checked 12 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 |
|---|---|---|---|---|
Lean Business | £42.28, the lowest price | Stock not listed | Visit shop at Lean Business | |
Lean Audio | £42.88 | 1.4% above the lowest price | Back order | Visit shop at Lean Audio |
Willys-Hifi | £49.92 | 18% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
RumoH Import VAT and duty may apply | £39.84 | Stock not listed | Visit shop at RumoH | |
SoundImports Import VAT and duty may apply | £44.46 | 5.1% above the lowest price | 10 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 7 OctWillys-Hifi£51.95 → £49.92Down 3.9% from £51.95
- 30 SepWillys-Hifi£50.95 → £51.95Up 2.0% from £50.95
- 29 SepWillys-Hifi£51.95 → £50.95Down 1.9% from £51.95