Dayton AudioPSS555-8
£196.43 · 43% less, betterFs28 Hz −14%, better
Qts0.33 –
Vas444 L +42%, worse
BL29.7 T·m –
Xmax11 mm −10%
Sensitivity96.4 dB –
21-inch LF driver · NERO series
SB Audience NERO-21SW1100D 8Ω
8 Ω
£343.60
SteadyLean Audio · In stock · All 2 offers
- Fs
- 32Hz
- Xmax
- 12.2mm
- SPL
- 97dB
- Pe
- –
- BL
- 30T·m
- Vd
- 2019cm³
- Qts
- 0.34
- Vas
- 313L
SB Audience NERO-21SW1100D is a 21-inch 8 ohm LF driver. The validated T/S data includes Fs 32 Hz, Qts 0.34, Vas 312.6 L, Xmax 12.2 mm, sensitivity 96.7 dB, plus 2019 cm³ Vd and 91 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 £343.60.
The published T/S values agree with each other
Thiele/Small
- Fs
- 32Hz
- Qts
- 0.34
- Qes
- 0.35
- Qms
- 10.9
- Vas
- 312.6L
- Re
- 5.1Ω
- Le
- 1.29mH
Motor and cone
- BL
- 30T·m
- Sd
- 1655cm²
- Mms
- 309g
- Xmax
- 12.2mm
- Vd †
- 2019cm³
Power and response
- Sensitivity †
- 96.7dB
- Impedance
- 8Ω
- EBP †
- 91 · Sealed or vented
Size and mounting
- Diameter
- 540mm
- Cutout
- 490mm
- Bolt circle
- 518mm
- Weight
- 21kg
Other published values
- Cms
- 0.08mm/N
- Rms
- 5.67kg/s
Other dimensions
- Mounting Depth
- 233.2
† Calculated by bits from the published values
What this validation status means
Everything else SB Audience lists
LF · Primary · 21″
- BL
- 30T·m
- Fs
- 32Hz
- Le
- 1.29mH
- Re
- 5.1Ω
- Sd
- 1655cm²
- Cms
- 0.08mm/N
- Mms
- 309g
- Qes
- 0.35
- Qms
- 10.9
- Qts
- 0.34
- Rms
- 5.67kg/s
- SPL
- 96.7dB
- Vas
- 312.6L
- Xmax
- 12.2mm
- Impedance
- 8Ω
- Calculated sensitivity †
- 96.7dB
- Weight
- 21kg
- Diameter
- 540mm
- Mounting Depth
- 233.2
- Cutout
- 490mm
- Bolt circle
- 518mm
02
Compare
Same-size drivers, compared with the NERO-21SW1100D. Clear differences are green when better and red when worse.
This driverNERO-21SW1100D
Best price
£343.60
Fs
32 Hz
Qts
0.34
Vas
312.6 L
BL
30 T·m
Xmax
12.2 mm
Sensitivity
96.7 dB
Power
–
Beyma21QLEX1600FE
£425.00 · 24% more, worseFs30 Hz −6%
Qts0.28 −18%, better
Vas309 L –
BL36.4 T·m +21%, better
Xmax13 mm +7%
Sensitivity96.5 dB –
Eighteen Sound21LW2600
£429.42 · 25% more, worseFs27 Hz −16%, better
Qts0.33 –
Vas333 L +7%
BL32.5 T·m +8%
Xmax14.6 mm +20%, better
Sensitivity94.9 dB −1.8
CelestionTSQ2145
£445.00 · 30% more, worseFs30 Hz −6%
Qts0.34 –
Vas253.8 L −19%, better
BL33.8 T·m +13%, better
Xmax15 mm +23%, better
Sensitivity94.8 dB −1.9
RCFLF21X451
£448.61 · 31% more, worseFs28 Hz −13%, better
Qts0.37 +9%
Vas385 L +23%, worse
BL30.5 T·m –
Xmax14 mm +15%, better
Sensitivity95.4 dB −1.3
B&C21SW115
£462.96 · 35% more, worseFs30 Hz −6%
Qts0.37 +9%
Vas318 L –
BL30.1 T·m –
Xmax14 mm +15%, better
Sensitivity95.5 dB −1.2
Beyma21LEX1600ND
£475.00 · 38% more, worseFs30 Hz −6%
Qts0.29 −15%, better
Vas305 L –
BL36.6 T·m +22%, better
Xmax14 mm +15%, better
Sensitivity96.4 dB –
RCFLF21N451
£475.00 · 38% more, worseFs30 Hz −6%
Qts0.26 −24%, better
Vas375 L +20%, worse
BL34.5 T·m +15%, better
Xmax13 mm +7%
Sensitivity97.8 dB +1.1
Eighteen Sound21NLW4100
£510.95 · 49% more, worseFs34 Hz +6%
Qts0.40 +18%, worse
Vas219 L −30%, better
BL22.8 T·m −24%, worse
Xmax15.2 mm +25%, better
Sensitivity95.1 dB −1.6
B&C21SW152
£542.37 · 58% more, worseFs32 Hz –
Qts0.36 +6%
Vas200 L −36%, better
BL39 T·m +30%, better
Xmax15 mm +23%, better
Sensitivity94.4 dB −2.3, worse
Eighteen Sound21LW1400
£548.61 · 60% more, worseFs28 Hz −13%, better
Qts0.24 −29%, better
Vas385 L +23%, worse
BL33.5 T·m +12%, better
Xmax9.5 mm −22%, worse
Sensitivity97.5 dB +0.8
Eighteen Sound21NLW9001
£554.81 · 61% more, worseFs32 Hz –
Qts0.31 −9%
Vas244 L −22%, better
BL37 T·m +23%, better
Xmax14 mm +15%, better
Sensitivity95.7 dB −1
Eighteen Sound21NTLW5000
£595.00 · 73% more, worseFs31 Hz −3%
Qts0.36 +6%
Vas270 L −14%, better
BL32 T·m +7%
Xmax17.5 mm +43%, better
Sensitivity95.3 dB −1.4
Eighteen Sound21NLW4000
£613.78 · 79% more, worseFs29 Hz −9%
Qts0.37 +9%
Vas305 L –
BL30 T·m –
Xmax15 mm +23%, better
Sensitivity94.9 dB −1.8
Eighteen Sound21NLW9601
£629.38 · 83% more, worseFs37 Hz +16%, worse
Qts0.29 −15%, better
Vas175 L −44%, better
BL43 T·m +43%, better
Xmax14 mm +15%, better
Sensitivity96.6 dB –
EminenceNSW6021-6
£800.00 · 133% more, worseFs29 Hz −9%
Qts0.31 −9%
Vas224.6 L −28%, better
BL33.8 T·m +13%, better
Xmax21 mm +72%, better
Sensitivity94.5 dB −2.2, worse
EminenceNSW6021-124
£925.57 · 169% more, worseFs31 Hz −4%
Qts0.32 −6%
Vas224.6 L −28%, better
BL30.5 T·m –
Xmax21 mm +72%, better
Sensitivity95 dB −1.7
No current price
Fs35 Hz +9%
Qts0.34 –
Vas266 L −15%, better
BL31.3 T·m +4%
Xmax14 mm +15%, better
Sensitivity97.1 dB –
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +9%
Qts0.34 –
Vas266 L −15%, better
BL31.3 T·m +4%
Xmax14 mm +15%, better
Sensitivity97.1 dB –
Eighteen Sound21LW2500
No current priceFs29 Hz −9%
Qts0.37 +9%
Vas305 L –
BL30 T·m –
Xmax14 mm +15%, better
Sensitivity94.9 dB −1.8
No current price
Fs33 Hz +3%
Qts0.36 +6%
Vas241 L −23%, better
BL30 T·m –
Xmax14 mm +15%, better
Sensitivity95.7 dB −1
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz +3%
Qts0.36 +6%
Vas241 L −23%, better
BL30 T·m –
Xmax14 mm +15%, better
Sensitivity95.7 dB −1
P.AudioSD21-125XB
No current priceFs35 Hz +9%
Qts0.38 +12%, worse
Vas345.6 L +11%, worse
BL30.4 T·m –
Xmax11.3 mm −8%
Sensitivity97.7 dB +1
Eighteen Sound21NLW5300
No current priceFs31 Hz −3%
Qts0.32 −6%
Vas325 L +4%
BL31 T·m +3%
Xmax15.3 mm +25%, better
Sensitivity96.6 dB –
CelestionNTR21-5010JD
No current priceFs32 Hz –
Qts0.32 −6%
Vas276.7 L −11%, better
BL33.9 T·m +13%, better
Xmax9 mm −26%, worse
Sensitivity96.4 dB –
Eighteen Sound21NLW9601C
No current priceFs38 Hz +19%, worse
Qts0.29 −15%, better
Vas140 L −55%, better
BL33.2 T·m +11%, better
Xmax14 mm +15%, better
Sensitivity96 dB −0.7
Sica21 S 4 PL
No current priceFs35 Hz +8%
Qts0.30 −12%, better
Vas255 L −18%, better
BL36.1 T·m +20%, better
Xmax5.2 mm −57%, worse
Sensitivity97.4 dB +0.7
B&C21SW150
No current priceFs29 Hz −9%
Qts0.26 −24%, better
Vas254 L −19%, better
BL32.6 T·m +9%
Xmax15 mm +23%, better
Sensitivity95.6 dB −1.1
BishopSoundBWN21/4
No current priceFs29 Hz −9%
Qts0.42 +23%, worse
Vas244.2 L −22%, better
BL32.6 T·m +9%
Xmax15 mm +23%, better
Sensitivity93.2 dB −3.5, worse
BishopSoundBWN21/8
No current priceFs29 Hz −9%
Qts0.42 +23%, worse
Vas244.2 L −22%, better
BL32.6 T·m +9%
Xmax15 mm +23%, better
Sensitivity93.2 dB −3.5, worse
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 51 rating · Checked 13 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 Audio | £343.60, the lowest price | In stock | Visit shop at Lean Audio | |
SoundImports Import VAT and duty may apply | £464.60 | 35% above the lowest price | 4 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr