SB AudienceNERO-21SW1100D
£343.60 · 77% more, worseFs32 Hz +16%, worse
Qts0.34 +3%
Vas312.6 L −30%, better
BL30 T·m –
Xmax12.2 mm +11%, better
Sensitivity96.7 dB –
21-inch LF driver · 1,000 W
Dayton Audio PSS555-8 8Ω
8 Ω · 27–2500 Hz
£194.48
SteadyParts Express · 98 in stock · Ships from United States · All 2 offers
- Fs
- 28Hz
- Xmax
- 11mm
- SPL
- 96dB
- Pe
- 1000W
- BL
- 29.7T·m
- Vd
- 1909cm³
- Qts
- 0.33
- Vas
- 444L
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
30 degrees
Frequency response
240 plotted pointsMedium confidence1,734 selected pixels of 2,806 - Trace datasheet-response-trace-poc/v1
on-axis
Frequency response
240 plotted pointsMedium confidence4,449 selected pixels of 4,449
Dayton Audio PSS555-8 is a 21-inch 8 ohm LF driver rated at 1000 W RMS. The validated T/S data includes Fs 28 Hz, Qts 0.33, Vas 444 L, Xmax 11 mm, sensitivity 96.4 dB, plus 1909 cm³ Vd and 81 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 £194.48.
The published T/S values agree with each other
Thiele/Small
- Fs
- 28Hz
- Qts
- 0.33
- Qes
- 0.34
- Qms
- 10.7
- Vas
- 444L
- Re
- 5.4Ω
- Le
- 1.80mH
Motor and cone
- BL
- 29.7T·m
- Sd
- 1735cm²
- Mms
- 316g
- Xmax
- 11mm
- Vd †
- 1909cm³
Power and response
- Sensitivity †
- 96.4dB
- Manufacturer sensitivity
- 96.3dB
- Power
- 1000W
- Impedance
- 8Ω
- Range
- 27–2500Hz
- EBP †
- 81 · Sealed or vented
Size and mounting
- Diameter
- 549.9mm
- Cutout
- 510.5mm
- Depth
- 254mm
Other published values
- Cms
- 0.11mm/N
- Power Peak
- 2000
† Calculated by bits from the published values
What this validation status means
Everything else Dayton Audio lists
LF · Primary · 21″
- BL
- 29.7T·m
- Fs
- 28Hz
- Le
- 1.80mH
- Re
- 5.4Ω
- Sd
- 1735cm²
- Cms
- 0.11mm/N
- Mms
- 316g
- Qes
- 0.34
- Qms
- 10.7
- Qts
- 0.33
- SPL
- 96.4dB
- Vas
- 444L
- Xmax
- 11mm
- Power
- 1000W
- Impedance
- 8Ω
- Power Peak
- 2000
- Sensitivity
- 96.3dB
- Low limit
- 27Hz
- Calculated sensitivity †
- 96.4dB
- High limit
- 2500Hz
- Manufacturer sensitivity
- 96.3dB
- Diameter
- 549.9mm
- Depth
- 254mm
- Cutout
- 510.5mm
02
Compare
Same-size drivers, compared with the PSS555-8. Clear differences are green when better and red when worse.
This driverPSS555-8
Best price
£194.48
Fs
28 Hz
Qts
0.33
Vas
444 L
BL
29.7 T·m
Xmax
11 mm
Sensitivity
96.4 dB
Power
1000 W
SB AudienceROSSO-21SW800
£418.61 · 115% more, worseFs38 Hz +38%, worse
Qts0.76 +130%, worse
Vas224.4 L −49%, better
BL24.1 T·m −19%, worse
Xmax11.4 mm +4%
Sensitivity93.9 dB −2.5, worse
Eighteen Sound21LW2600
£425.60 · 119% more, worseFs27 Hz –
Qts0.33 –
Vas333 L −25%, better
BL32.5 T·m +9%
Xmax14.6 mm +33%, better
Sensitivity94.9 dB −1.5
CelestionTSQ2145
£445.00 · 129% more, worseFs30 Hz +9%
Qts0.34 +4%
Vas253.8 L −43%, better
BL33.8 T·m +14%, better
Xmax15 mm +36%, better
Sensitivity94.8 dB −1.6
RCFLF21X451
£448.61 · 131% more, worseFs28 Hz –
Qts0.37 +12%, worse
Vas385 L −13%, better
BL30.5 T·m –
Xmax14 mm +27%, better
Sensitivity95.4 dB −1
Dayton AudioHTS545HE-4
£448.82 · 131% more, worseFs26 Hz −5%
Qts0.28 −15%, better
Vas179 L −60%, better
BL38.2 T·m +29%, better
Xmax21 mm +91%, better
Sensitivity92.5 dB −3.9, worse
B&C21SW115
£458.85 · 136% more, worseFs30 Hz +9%
Qts0.37 +12%, worse
Vas318 L −28%, better
BL30.1 T·m –
Xmax14 mm +27%, better
Sensitivity95.5 dB −0.9
RCFLF21N451
£475.00 · 144% more, worseFs30 Hz +9%
Qts0.26 −21%, better
Vas375 L −16%, better
BL34.5 T·m +16%, better
Xmax13 mm +18%, better
Sensitivity97.8 dB +1.4
Beyma21LEX1600ND
£475.00 · 144% more, worseFs30 Hz +9%
Qts0.29 −12%, better
Vas305 L −31%, better
BL36.6 T·m +23%, better
Xmax14 mm +27%, better
Sensitivity96.4 dB –
Beyma21QLEX1600FE
£493.97 · 154% more, worseFs30 Hz +9%
Qts0.28 −15%, better
Vas309 L −30%, better
BL36.4 T·m +23%, better
Xmax13 mm +18%, better
Sensitivity96.5 dB –
B&C21SW152
£537.55 · 176% more, worseFs32 Hz +16%, worse
Qts0.36 +9%
Vas200 L −55%, better
BL39 T·m +31%, better
Xmax15 mm +36%, better
Sensitivity94.4 dB −2, worse
Eighteen Sound21LW1400
£543.74 · 180% more, worseFs28 Hz –
Qts0.24 −27%, better
Vas385 L −13%, better
BL33.5 T·m +13%, better
Xmax9.5 mm −14%, worse
Sensitivity97.5 dB +1.1
Eighteen Sound21NLW9001
£549.89 · 183% more, worseFs32 Hz +16%, worse
Qts0.31 −6%
Vas244 L −45%, better
BL37 T·m +25%, better
Xmax14 mm +27%, better
Sensitivity95.7 dB −0.7
No photo
Precision DevicesPD.2155-1N
£555.00 · 185% more, worseFs33 Hz +20%, worse
Qts0.36 +9%
Vas241 L −46%, better
BL30 T·m –
Xmax14 mm +27%, better
Sensitivity95.7 dB −0.7
Eighteen Sound21NTLW5000
£595.00 · 206% more, worseFs31 Hz +12%, worse
Qts0.36 +9%
Vas270 L −39%, better
BL32 T·m +8%
Xmax17.5 mm +59%, better
Sensitivity95.3 dB −1.1
Eighteen Sound21NLW4000
£608.33 · 213% more, worseFs29 Hz +5%
Qts0.37 +12%, worse
Vas305 L −31%, better
BL30 T·m –
Xmax15 mm +36%, better
Sensitivity94.9 dB −1.5
Eighteen Sound21NLW9601
£623.80 · 221% more, worseFs37 Hz +34%, worse
Qts0.29 −12%, better
Vas175 L −61%, better
BL43 T·m +45%, better
Xmax14 mm +27%, better
Sensitivity96.6 dB –
No photo
Precision DevicesPD.2160-1N
£799.00 · 311% more, worseFs35 Hz +27%, worse
Qts0.30 −9%
Vas177 L −60%, better
BL43 T·m +45%, better
Xmax16 mm +45%, better
Sensitivity95.9 dB −0.5
EminenceNSW6021-124
£916.36 · 371% more, worseFs31 Hz +11%, worse
Qts0.32 −3%
Vas224.6 L −49%, better
BL30.5 T·m –
Xmax21 mm +91%, better
Sensitivity95 dB −1.4
P.AudioSD21-125XB
No current priceFs35 Hz +27%, worse
Qts0.38 +15%, worse
Vas345.6 L −22%, better
BL30.4 T·m –
Xmax11.3 mm –
Sensitivity97.7 dB +1.3
Eighteen Sound21NLW5300
No current priceFs31 Hz +12%, worse
Qts0.32 −3%
Vas325 L −27%, better
BL31 T·m +4%
Xmax15.3 mm +39%, better
Sensitivity96.6 dB –
CelestionNTR21-5010JD
No current priceFs32 Hz +17%, worse
Qts0.32 −3%
Vas276.7 L −38%, better
BL33.9 T·m +14%, better
Xmax9 mm −18%, worse
Sensitivity96.4 dB –
No current price
Fs35 Hz +27%, worse
Qts0.34 –
Vas266 L −40%, better
BL31.3 T·m +5%
Xmax14 mm +27%, better
Sensitivity97.1 dB +0.7
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +27%, worse
Qts0.34 –
Vas266 L −40%, better
BL31.3 T·m +5%
Xmax14 mm +27%, better
Sensitivity97.1 dB +0.7
Eighteen Sound21LW2500
No current priceFs29 Hz +5%
Qts0.37 +12%, worse
Vas305 L −31%, better
BL30 T·m –
Xmax14 mm +27%, better
Sensitivity94.9 dB −1.5
No current price
Fs33 Hz +20%, worse
Qts0.36 +9%
Vas241 L −46%, better
BL30 T·m –
Xmax14 mm +27%, better
Sensitivity95.7 dB −0.7
Sica21 S 4 PL
No current priceFs35 Hz +25%, worse
Qts0.30 −9%
Vas255 L −43%, better
BL36.1 T·m +22%, better
Xmax5.2 mm −53%, worse
Sensitivity97.4 dB +1
Eighteen Sound21NLW9601C
No current priceFs38 Hz +38%, worse
Qts0.29 −12%, better
Vas140 L −68%, better
BL33.2 T·m +12%, better
Xmax14 mm +27%, better
Sensitivity96 dB –
B&C21SW150
No current priceFs29 Hz +5%
Qts0.26 −21%, better
Vas254 L −43%, better
BL32.6 T·m +10%
Xmax15 mm +36%, better
Sensitivity95.6 dB −0.8
Dayton AudioPSS545HE-4
No current priceFs29 Hz +4%
Qts0.27 −18%, better
Vas212.2 L −52%, better
BL35.5 T·m +20%, better
Xmax21 mm +91%, better
Sensitivity94.6 dB −1.8
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express4.7 out of 520 ratings · Checked 26 Oct 2026Read reviews on Parts Express
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Parts Express Import VAT and duty may apply | £194.48, the lowest price | 98 in stock | Visit shop at Parts Express | |
Audiophonics Import VAT and duty may apply | £300.59 | 55% above the lowest price | Available on order | Visit shop at Audiophonics |
Best price over time
Tracked since 22 Jul