Dayton AudioRS180-8
£59.83 · 73% less, betterFs36 Hz +79%, worse
Qts0.31 –
Vas24.4 L −82%, better
BL7.8 T·m −5%
Xmax6 mm −8%
Sensitivity86.3 dB −0.8
8-inch LF driver · Classic series · 42 mm voice coil · 100 W
Scanspeak 21W/8555-10 8Ω
8 Ω
- Fs
- 20Hz
- Xmax
- 6.5mm
- SPL
- 87dB
- Pe
- 100W
- BL
- 8.2T·m
- Vd
- 143cm³
- Qts
- 0.31
- Vas
- 134L
Scanspeak 21W/8555-10 is an 8-inch 8 ohm LF driver rated at 100 W RMS. The validated T/S data includes Fs 20 Hz, Qts 0.31, Vas 134 L, Xmax 6.5 mm, sensitivity 87.1 dB, plus 143 cm³ Vd and 61 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 £217.66.
The published T/S values agree with each other
Thiele/Small
- Fs
- 20Hz
- Qts
- 0.31
- Qes
- 0.33
- Qms
- 4.5
- Vas
- 134L
- Re
- 5.5Ω
- Le
- 0.40mH
Motor and cone
- BL
- 8.2T·m
- Sd
- 220cm²
- Mms
- 32g
- Xmax
- 6.5mm
- Vd †
- 143cm³
- Voice coil
- 42mm
Power and response
- Sensitivity †
- 87.1dB
- Manufacturer sensitivity
- 87dB
- Power
- 100W
- Impedance
- 8Ω
- Min. impedance
- 6.4Ω
- EBP †
- 61 · Sealed or vented
Size and mounting
- Diameter
- 210mm
Other published values
- Cms
- 1.98mm/N
- Rms
- 0.89kg/s
- Xmech
- 12
- Power Peak
- 160
† Calculated by bits from the published values
What this validation status means
Everything else Scanspeak lists
LF · Primary · 8″
- BL
- 8.2T·m
- Fs
- 20Hz
- Le
- 0.40mH
- Re
- 5.5Ω
- Sd
- 220cm²
- Cms
- 1.98mm/N
- Mms
- 32g
- Qes
- 0.33
- Qms
- 4.5
- Qts
- 0.31
- Rms
- 0.89kg/s
- SPL
- 87.1dB
- Vas
- 134L
- Xmax
- 6.5mm
- Xmech
- 12
- Power
- 100W
- Impedance
- 8Ω
- Power Peak
- 160
- Sensitivity
- 87dB
- Calculated sensitivity †
- 87.1dB
- Manufacturer sensitivity
- 87dB
- Min. impedance
- 6.4Ω
- Voice coil
- 42mm
- Diameter
- 210mm
02
Compare
Same-size drivers, compared with the 21W/8555-10. Clear differences are green when better and red when worse.
This driver21W/8555-10
Best price
£217.66
Fs
20 Hz
Qts
0.31
Vas
134 L
BL
8.2 T·m
Xmax
6.5 mm
Sensitivity
87.1 dB
Power
100 W
SB AcousticsSB23NRXS45-4
£84.41 · 61% less, betterFs27 Hz +35%, worse
Qts0.30 −3%
Vas87.5 L −35%, better
BL6.9 T·m −16%, worse
Xmax6.5 mm –
Sensitivity89.3 dB +2.2, better
SB AcousticsSB23NACS45-4
£88.56 · 59% less, betterFs23 Hz +15%, worse
Qts0.33 +6%
Vas95 L −29%, better
BL6.7 T·m −18%, worse
Xmax6.5 mm –
Sensitivity87.2 dB –
SB AcousticsSB23NACS45-8
£88.56 · 59% less, betterFs25 Hz +25%, worse
Qts0.37 +19%, worse
Vas94 L −30%, better
BL7.9 T·m −4%
Xmax6.5 mm –
Sensitivity87.7 dB +0.6
SB AcousticsSB23NBACS45-4
£98.70 · 55% less, betterFs23 Hz +15%, worse
Qts0.33 +6%
Vas95 L −29%, better
BL6.7 T·m −18%, worse
Xmax6.5 mm –
Sensitivity87.2 dB –
B&C8FG51
£99.64 · 54% less, betterFs49 Hz +145%, worse
Qts0.32 +3%
Vas20 L −85%, better
BL12.9 T·m +57%, better
Xmax6.5 mm –
Sensitivity90.4 dB +3.3, better
SB AcousticsSB23CACS45-4
£111.28 · 49% less, betterFs23 Hz +15%, worse
Qts0.33 +6%
Vas95 L −29%, better
BL6.7 T·m −18%, worse
Xmax6.5 mm –
Sensitivity87.2 dB –
VisatonGF 200
£132.67 · 39% less, betterFs30 Hz +50%, worse
Qts0.34 +10%
Vas68 L −49%, better
BL9.2 T·m +12%, better
Xmax6 mm −8%
Sensitivity89 dB +1.9
Scanspeak18W/8545K00
£144.00 · 34% less, betterFs28 Hz +40%, worse
Qts0.28 −10%
Vas46.4 L −65%, better
BL8.2 T·m –
Xmax6.5 mm –
Sensitivity87.3 dB –
VisatonAL 200
£150.67 · 31% less, betterFs32 Hz +60%, worse
Qts0.35 +13%, worse
Vas77 L −43%, better
BL8.8 T·m +7%
Xmax7 mm +8%
Sensitivity90.1 dB +3, better
£156.31 · 28% less, better
Fs29 Hz +45%, worse
Qts0.29 −6%
Vas103 L −23%, better
BL8 T·m –
Xmax4 mm −38%, worse
Sensitivity90.7 dB +3.6, better
SB AcousticsMW19P-8
£167.42 · 23% less, betterFs30 Hz +48%, worse
Qts0.29 −6%
Vas61 L −54%, better
BL7.7 T·m −6%
Xmax6.7 mm +3%
Sensitivity88.9 dB +1.8
SB AcousticsMW19PNW-8
£170.81 · 22% less, betterFs30 Hz +48%, worse
Qts0.29 −6%
Vas61 L −54%, better
BL7.7 T·m −6%
Xmax6.7 mm +3%
Sensitivity88.9 dB +1.8
SEASH1471-08 CA22RNY
£171.54 · 21% less, betterFs34 Hz +70%, worse
Qts0.30 −3%
Vas82 L −39%, better
BL8.5 T·m +4%
Xmax6 mm −8%
Sensitivity91.5 dB +4.4, better
WavecorWF182BD08
£190.66 · 12% less, betterFs33 Hz +67%, worse
Qts0.29 −6%
Vas32.4 L −76%, better
BL8.5 T·m +4%
Xmax5.5 mm −15%, worse
Sensitivity88.1 dB +1
WavecorWF182BD16
£191.74 · 12% less, betterFs37 Hz +85%, worse
Qts0.30 −3%
Vas23 L −83%, better
BL8.5 T·m +4%
Xmax5.5 mm −15%, worse
Sensitivity87.8 dB +0.7
SB AcousticsMT19CP-8
£234.41 · 8% more, worseFs43 Hz +115%, worse
Qts0.31 –
Vas37.1 L −72%, better
BL8.1 T·m –
Xmax3.6 mm −45%, worse
Sensitivity91.5 dB +4.4, better
SB AcousticsMW19TX-8
£283.85 · 30% more, worseFs33 Hz +65%, worse
Qts0.33 +6%
Vas53.4 L −60%, better
BL7.5 T·m −9%
Xmax6.7 mm +3%
Sensitivity89.4 dB +2.3, better
£309.76 · 42% more, worse
Fs33 Hz +65%, worse
Qts0.30 −3%
Vas72 L −46%, better
BL8.8 T·m +7%
Xmax7 mm +8%
Sensitivity90.6 dB +3.5, better
£410.34 · 89% more, worse
Fs21 Hz +5%
Qts0.29 −6%
Vas164 L +22%, worse
BL8 T·m –
Xmax7 mm +8%
Sensitivity88.9 dB +1.8
Scanspeak21WE/4542T00
£669.81 · 208% more, worseFs38 Hz +90%, worse
Qts0.28 −10%
Vas54 L −60%, better
BL8.2 T·m –
Xmax7.2 mm +11%, better
Sensitivity92 dB +4.9, better
HiViSS8II
No current priceFs32 Hz +60%, worse
Qts0.32 +3%
Vas61.6 L −54%, better
BL8.5 T·m +4%
Xmax5.8 mm −11%, worse
Sensitivity89.8 dB +2.7, better
WavecorWF182BD15
No current priceFs39 Hz +95%, worse
Qts0.32 +3%
Vas20.8 L −84%, better
BL8.5 T·m +4%
Xmax5.5 mm −15%, worse
Sensitivity87.8 dB +0.7
CIAREHWB205
No current priceFs28 Hz +40%, worse
Qts0.29 −6%
Vas79 L −41%, better
BL9.3 T·m +13%, better
Xmax7 mm +8%
Sensitivity89.6 dB +2.5, better
SB AcousticsMW19PF-8
No current priceFs30 Hz +50%, worse
Qts0.34 +10%
Vas63 L −53%, better
BL7 T·m −15%, worse
Xmax6.5 mm –
Sensitivity88.7 dB +1.6
Audio Technology18 H 52 17 06 SD
No current priceFs36 Hz +80%, worse
Qts0.28 −10%
Vas34 L −75%, better
BL6.6 T·m −20%, worse
Xmax6.3 mm −3%
Sensitivity88.8 dB +1.7
HiViSS8
No current priceFs30 Hz +50%, worse
Qts0.33 +6%
Vas83.3 L −38%, better
BL6.8 T·m −17%, worse
Xmax6 mm −8%
Sensitivity89.6 dB +2.5, better
WavecorWF182BD07
No current priceFs40 Hz +100%, worse
Qts0.34 +10%
Vas24.4 L −82%, better
BL8.5 T·m +4%
Xmax5.5 mm −15%, worse
Sensitivity88.5 dB +1.4
WavecorWF182BD10
No current priceFs29 Hz +43%, worse
Qts0.31 –
Vas32.4 L −76%, better
BL6.5 T·m −21%, worse
Xmax5.5 mm −15%, worse
Sensitivity85.7 dB −1.4
WavecorWF182BD18
No current priceFs29 Hz +43%, worse
Qts0.31 –
Vas32.4 L −76%, better
BL6.5 T·m −21%, worse
Xmax5.5 mm −15%, worse
Sensitivity85.7 dB −1.4
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports5.0 out of 54 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 |
|---|---|---|---|---|
Falcon Acoustics | £229.14, the lowest price | In stock | Visit shop at Falcon Acoustics | |
Willys-Hifi | £247.48 | 8.0% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
Wilmslow Audio | £277.87 | 21% above the lowest price | Stock not listed | Visit shop at Wilmslow Audio |
SoundImports Import VAT and duty may apply | £217.66 | 6 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£253.95 → £247.48Down 2.5% from £253.95
- 30 SepWillys-Hifi£252.95 → £253.95Up 0.4% from £252.95
- 28 SepWillys-Hifi£251.95 → £252.95Up 0.4% from £251.95