Dayton AudioPSS555-8
£196.85 · 54% less, betterFs28 Hz −27%, better
Qts0.33 −57%, better
Vas444 L +98%, worse
BL29.7 T·m +23%, better
Xmax11 mm −4%
Sensitivity96.4 dB +2.5, better
21-inch LF driver · ROSSO series · 113 mm voice coil · 800 W
SB Audience ROSSO-21SW800 8Ω
8 Ω · 38–3200 Hz
£423.44
SteadySoundImports · 2 in stock · Ships from Netherlands · All 2 offers
- Fs
- 38Hz
- Xmax
- 11.4mm
- SPL
- 94dB
- Pe
- 800W
- BL
- 24.1T·m
- Vd
- 1898cm³
- Qts
- 0.76
- Vas
- 224L
SB Audience ROSSO-21SW800 is a 21-inch 8 ohm LF driver rated at 800 W RMS. The validated T/S data includes Fs 38 Hz, Qts 0.76, Vas 224.4 L, Xmax 11.4 mm, sensitivity 93.9 dB, plus 1898 cm³ Vd and 48 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 £423.44.
The published T/S values agree with each other
Thiele/Small
- Fs
- 38Hz
- Qts
- 0.76
- Qes
- 0.80
- Qms
- 14.4
- Vas
- 224.4L
- Re
- 6.4Ω
- Le
- 1.82mH
Motor and cone
- BL
- 24.1T·m
- Sd
- 1662cm²
- Mms
- 301g
- Xmax
- 11.4mm
- Vd †
- 1898cm³
- Voice coil
- 113mm
- Flux density
- 0.95T
Power and response
- Sensitivity †
- 93.9dB
- Manufacturer sensitivity
- 98dB
- Power
- 800W
- Impedance
- 8Ω
- Min. impedance
- 6.2Ω
- Range
- 38–3200Hz
- EBP †
- 48 · Leans sealed
Size and mounting
- Diameter
- 540mm
- Cutout
- 490mm
- Bolt circle
- 518mm
- Weight
- 16.7kg
Other published values
- Cms
- 0.06mm/N
- Rms
- 5.03kg/s
- Power Program
- 1600
Other dimensions
- Mounting Depth
- 230
Sensitivity shows 93.9 dB, calculated from the T/S values. SB Audience publishes 98.0 dB, 4.1 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else SB Audience lists
LF · Primary · 21″
- BL
- 24.1T·m
- Fs
- 38Hz
- Le
- 1.82mH
- Re
- 6.4Ω
- Sd
- 1662cm²
- Cms
- 0.06mm/N
- Mms
- 301g
- Qes
- 0.80
- Qms
- 14.4
- Qts
- 0.76
- Rms
- 5.03kg/s
- SPL
- 93.9dB
- Vas
- 224.4L
- Xmax
- 11.4mm
- Power
- 800W
- Impedance
- 8Ω
- Flux density
- 0.95T
- Sensitivity
- 98dB
- Low limit
- 38Hz
- Power Program
- 1600
- Calculated sensitivity †
- 93.9dB
- High limit
- 3200Hz
- Manufacturer sensitivity
- 98dB
- Min. impedance
- 6.2Ω
- Voice coil
- 113mm
- Weight
- 16.7kg
- Diameter
- 540mm
- Mounting Depth
- 230
- Cutout
- 490mm
- Bolt circle
- 518mm
02
Compare
Same-size drivers, compared with the ROSSO-21SW800. Clear differences are green when better and red when worse.
This driverROSSO-21SW800
Best price
£423.44
Fs
38 Hz
Qts
0.76
Vas
224.4 L
BL
24.1 T·m
Xmax
11.4 mm
Sensitivity
93.9 dB
Power
800 W
SB AudienceNERO-21SW1100D
£343.60 · 19% less, betterFs32 Hz −16%, better
Qts0.34 −55%, better
Vas312.6 L +39%, worse
BL30 T·m +24%, better
Xmax12.2 mm +7%
Sensitivity96.7 dB +2.8, better
Beyma21QLEX1600FE
£425.00 · Same priceFs30 Hz −21%, better
Qts0.28 −63%, better
Vas309 L +38%, worse
BL36.4 T·m +51%, better
Xmax13 mm +14%, better
Sensitivity96.5 dB +2.6, better
CelestionTSQ2145
£445.00 · 5% more, worseFs30 Hz −21%, better
Qts0.34 −55%, better
Vas253.8 L +13%, worse
BL33.8 T·m +40%, better
Xmax15 mm +31%, better
Sensitivity94.8 dB +0.9
Dayton AudioHTS545HE-4
£454.29 · 7% more, worseFs26 Hz −31%, better
Qts0.28 −63%, better
Vas179 L −20%, better
BL38.2 T·m +59%, better
Xmax21 mm +84%, better
Sensitivity92.5 dB −1.4
Eighteen Sound21NLW4100
£456.79 · 8% more, worseFs36 Hz −5%
Qts0.46 −39%, better
Vas210 L −6%
BL29.4 T·m +22%, better
Xmax15.2 mm +33%, better
Sensitivity95 dB +1.1
B&C21SW115
£464.13 · 10% more, worseFs30 Hz −21%, better
Qts0.37 −51%, better
Vas318 L +42%, worse
BL30.1 T·m +25%, better
Xmax14 mm +23%, better
Sensitivity95.5 dB +1.6
Beyma21LEX1600ND
£475.00 · 12% more, worseFs30 Hz −21%, better
Qts0.29 −62%, better
Vas305 L +36%, worse
BL36.6 T·m +52%, better
Xmax14 mm +23%, better
Sensitivity96.4 dB +2.5, better
B&C21DS115
£481.07 · 14% more, worseFs34 Hz −11%, better
Qts0.27 −64%, better
Vas204 L −9%
BL39.3 T·m +63%, better
Xmax16.5 mm +44%, better
Sensitivity96.6 dB +2.7, better
LavoceSAN214.50
£481.92 · 14% more, worseFs33 Hz −13%, better
Qts0.28 −63%, better
Vas218.3 L –
BL39.6 T·m +64%, better
Xmax15.4 mm +35%, better
Sensitivity96.4 dB +2.5, better
B&C21SW152
£543.75 · 28% more, worseFs32 Hz −16%, better
Qts0.36 −53%, better
Vas200 L −11%, better
BL39 T·m +62%, better
Xmax15 mm +31%, better
Sensitivity94.4 dB +0.5
Eighteen Sound21NLW9001
£556.22 · 31% more, worseFs32 Hz −16%, better
Qts0.31 −59%, better
Vas244 L +9%
BL37 T·m +54%, better
Xmax14 mm +23%, better
Sensitivity95.7 dB +1.8
Eighteen Sound21NTLW5000
£595.00 · 41% more, worseFs31 Hz −18%, better
Qts0.36 −53%, better
Vas270 L +20%, worse
BL32 T·m +33%, better
Xmax17.5 mm +53%, better
Sensitivity95.3 dB +1.4
Eighteen Sound21NLW9601
£630.98 · 49% more, worseFs37 Hz –
Qts0.29 −62%, better
Vas175 L −22%, better
BL43 T·m +78%, better
Xmax14 mm +23%, better
Sensitivity96.6 dB +2.7, better
EminenceNSW6021-6
£800.00 · 89% more, worseFs29 Hz −24%, better
Qts0.31 −59%, better
Vas224.6 L –
BL33.8 T·m +40%, better
Xmax21 mm +84%, better
Sensitivity94.5 dB +0.6
No photo
Precision DevicesPD.2160-1N
£811.00 · 92% more, worseFs35 Hz −8%
Qts0.30 −61%, better
Vas177 L −21%, better
BL43 T·m +78%, better
Xmax16 mm +40%, better
Sensitivity95.9 dB +2, better
B&C21IPAL
£863.28 · 104% more, worseFs37 Hz –
Qts0.21 −72%, better
Vas155 L −31%, better
BL19.1 T·m −21%, worse
Xmax22 mm +93%, better
Sensitivity97.6 dB +3.7, better
EminenceNSW6021-124
£927.53 · 119% more, worseFs31 Hz −19%, better
Qts0.32 −58%, better
Vas224.6 L –
BL30.5 T·m +27%, better
Xmax21 mm +84%, better
Sensitivity95 dB +1.1
Eighteen Sound21ID
No current priceFs38 Hz –
Qts0.23 −70%, better
Vas143 L −36%, better
BL25.2 T·m +5%
Xmax14 mm +23%, better
Sensitivity97.2 dB +3.3, better
No current price
Fs33 Hz −13%, better
Qts0.36 −53%, better
Vas241 L +7%
BL30 T·m +24%, better
Xmax14 mm +23%, better
Sensitivity95.7 dB +1.8
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz −13%, better
Qts0.36 −53%, better
Vas241 L +7%
BL30 T·m +24%, better
Xmax14 mm +23%, better
Sensitivity95.7 dB +1.8
P.AudioSD21-125XB
No current priceFs35 Hz −8%
Qts0.38 −50%, better
Vas345.6 L +54%, worse
BL30.4 T·m +26%, better
Xmax11.3 mm –
Sensitivity97.7 dB +3.8, better
No current price
Fs35 Hz −8%
Qts0.34 −55%, better
Vas266 L +19%, worse
BL31.3 T·m +30%, better
Xmax14 mm +23%, better
Sensitivity97.1 dB +3.2, better
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz −8%
Qts0.34 −55%, better
Vas266 L +19%, worse
BL31.3 T·m +30%, better
Xmax14 mm +23%, better
Sensitivity97.1 dB +3.2, better
CelestionTSQ2160
No current priceFs30 Hz −21%, better
Qts0.26 −66%, better
Vas234.8 L +5%
BL43.1 T·m +79%, better
Xmax18.8 mm +64%, better
Sensitivity95.8 dB +1.9
Dayton AudioPSS545HE-4
No current priceFs29 Hz −24%, better
Qts0.27 −64%, better
Vas212.2 L −5%
BL35.5 T·m +47%, better
Xmax21 mm +84%, better
Sensitivity94.6 dB +0.7
CelestionNTR21-5010JD
No current priceFs32 Hz −15%, better
Qts0.32 −58%, better
Vas276.7 L +23%, worse
BL33.9 T·m +40%, better
Xmax9 mm −21%, worse
Sensitivity96.4 dB +2.5, better
BishopSoundBWN21/4
No current priceFs29 Hz −24%, better
Qts0.42 −45%, better
Vas244.2 L +9%
BL32.6 T·m +35%, better
Xmax15 mm +31%, better
Sensitivity93.2 dB −0.7
BishopSoundBWN21/8
No current priceFs29 Hz −24%, better
Qts0.42 −45%, better
Vas244.2 L +9%
BL32.6 T·m +35%, better
Xmax15 mm +31%, better
Sensitivity93.2 dB −0.7
Sica21 S 4 PL
No current priceFs35 Hz −9%
Qts0.30 −61%, better
Vas255 L +14%, worse
BL36.1 T·m +50%, better
Xmax5.2 mm −54%, worse
Sensitivity97.4 dB +3.5, better
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 52 ratings · Checked 9 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 | £423.44, the lowest price | 2 in stock | Visit shop at SoundImports | |
Lean Audio | £319.73 | Out of stock | Visit shop at Lean Audio |
Best price over time
Tracked since 1 Apr