Dayton AudioPSS555-8
£194.48Fs28 Hz −14%, better
Qts0.33 +3%
Vas444 L +60%, worse
BL29.7 T·m −12%, worse
Xmax11 mm +22%, better
Sensitivity96.4 dB –
21-inch LF driver · NTR21 series · 125 mm voice coil · 1,600 W
Celestion NTR21-5010JD 8Ω
8 Ω · 30–3000 Hz
No price for delivery to the UK
- Fs
- 32Hz
- Xmax
- 9mm
- SPL
- 96dB
- Pe
- 1600W
- BL
- 33.9T·m
- Vd
- 1496cm³
- Qts
- 0.32
- Vas
- 277L
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 1 trace
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v1
LF frequency response
Frequency response
137 plotted pointsMedium confidence280 selected pixels of 444
Published graphs
Celestion NTR21-5010JD is a 21-inch 8 ohm LF driver rated at 1600 W RMS. The validated T/S data includes Fs 32 Hz, Qts 0.32, Vas 276.7 L, Xmax 9 mm, sensitivity 96.4 dB, plus 1496 cm³ Vd and 95 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.
The published T/S values agree with each other
Thiele/Small
- Fs
- 32Hz
- Qts
- 0.32
- Qes
- 0.34
- Qms
- 5.8
- Vas
- 276.7L
- Re
- 5.6Ω
- Le
- 2.25mH
Motor and cone
- BL
- 33.9T·m
- Sd
- 1662cm²
- Mms
- 344g
- Xmax
- 9mm
- Vd †
- 1496cm³
- Voice coil
- 125mm
Power and response
- Sensitivity †
- 96.4dB
- Manufacturer sensitivity
- 98dB
- Power
- 1600W
- Impedance
- 8Ω
- Range
- 30–3000Hz
- EBP †
- 95 · Sealed or vented
Size and mounting
- Diameter
- 550mm
- Cutout
- 492mm
- Bolt circle
- 528mm
- Depth
- 254mm
- Weight
- 12.8kg
Other published values
- Cms
- 0.07mm/N
- Rms
- 11.98kg/s
- Power Program
- 3200
Sensitivity shows 96.4 dB, calculated from the T/S values. Celestion publishes 98.0 dB, 1.6 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Celestion lists
LF · Primary · 21″
- BL
- 33.9T·m
- Fs
- 32Hz
- Le
- 2.25mH
- Re
- 5.6Ω
- Sd
- 1662cm²
- Cms
- 0.07mm/N
- Mms
- 344g
- Qes
- 0.34
- Qms
- 5.8
- Qts
- 0.32
- Rms
- 11.98kg/s
- SPL
- 96.4dB
- Vas
- 276.7L
- Xmax
- 9mm
- Power
- 1600W
- Impedance
- 8Ω
- Sensitivity
- 98dB
- Low limit
- 30Hz
- Power Program
- 3200
- Calculated sensitivity †
- 96.4dB
- High limit
- 3000Hz
- Manufacturer sensitivity
- 98dB
- Voice coil
- 125mm
- Weight
- 12.8kg
- Diameter
- 550mm
- Depth
- 254mm
- Cutout
- 492mm
- Bolt circle
- 528mm
02
Compare
Same-size drivers, compared with the NTR21-5010JD. Clear differences are green when better and red when worse.
This driverNTR21-5010JD
Best price
–
Fs
32 Hz
Qts
0.32
Vas
276.7 L
BL
33.9 T·m
Xmax
9 mm
Sensitivity
96.4 dB
Power
1600 W
SB AudienceNERO-21SW1100D
£343.60Fs32 Hz –
Qts0.34 +6%
Vas312.6 L +13%, worse
BL30 T·m −11%, worse
Xmax12.2 mm +36%, better
Sensitivity96.7 dB –
Eighteen Sound21LW2600
£425.60Fs27 Hz −16%, better
Qts0.33 +3%
Vas333 L +20%, worse
BL32.5 T·m −4%
Xmax14.6 mm +62%, better
Sensitivity94.9 dB −1.5
CelestionTSQ2145
£445.00Fs30 Hz −7%
Qts0.34 +7%
Vas253.8 L −8%
BL33.8 T·m –
Xmax15 mm +67%, better
Sensitivity94.8 dB −1.6
RCFLF21X451
£448.61Fs28 Hz −13%, better
Qts0.37 +16%, worse
Vas385 L +39%, worse
BL30.5 T·m −10%
Xmax14 mm +56%, better
Sensitivity95.4 dB −1
Dayton AudioHTS545HE-4
£448.82Fs26 Hz −18%, better
Qts0.28 −12%, better
Vas179 L −35%, better
BL38.2 T·m +13%, better
Xmax21 mm +133%, better
Sensitivity92.5 dB −3.9, worse
B&C21SW115
£458.85Fs30 Hz −7%
Qts0.37 +16%, worse
Vas318 L +15%, worse
BL30.1 T·m −11%, worse
Xmax14 mm +56%, better
Sensitivity95.5 dB −0.9
Beyma21LEX1600ND
£475.00Fs30 Hz −7%
Qts0.29 −9%
Vas305 L +10%, worse
BL36.6 T·m +8%
Xmax14 mm +56%, better
Sensitivity96.4 dB –
RCFLF21N451
£475.00Fs30 Hz −7%
Qts0.26 −19%, better
Vas375 L +36%, worse
BL34.5 T·m –
Xmax13 mm +44%, better
Sensitivity97.8 dB +1.4
B&C21DS115
£475.59Fs34 Hz +6%
Qts0.27 −16%, better
Vas204 L −26%, better
BL39.3 T·m +16%, better
Xmax16.5 mm +83%, better
Sensitivity96.6 dB –
Beyma21QLEX1600FE
£493.97Fs30 Hz −7%
Qts0.28 −12%, better
Vas309 L +12%, worse
BL36.4 T·m +8%
Xmax13 mm +44%, better
Sensitivity96.5 dB –
B&C21SW152
£537.55Fs32 Hz –
Qts0.36 +12%, worse
Vas200 L −28%, better
BL39 T·m +15%, better
Xmax15 mm +67%, better
Sensitivity94.4 dB −2, worse
Eighteen Sound21LW1400
£543.74Fs28 Hz −13%, better
Qts0.24 −25%, better
Vas385 L +39%, worse
BL33.5 T·m –
Xmax9.5 mm +6%
Sensitivity97.5 dB +1.1
Eighteen Sound21NLW9001
£549.89Fs32 Hz –
Qts0.31 −3%
Vas244 L −12%, better
BL37 T·m +9%
Xmax14 mm +56%, better
Sensitivity95.7 dB −0.7
No photo
Precision DevicesPD.2155-1N
£555.00Fs33 Hz –
Qts0.36 +12%, worse
Vas241 L −13%, better
BL30 T·m −11%, worse
Xmax14 mm +56%, better
Sensitivity95.7 dB −0.7
Eighteen Sound21NTLW5000
£595.00Fs31 Hz −4%
Qts0.36 +12%, worse
Vas270 L –
BL32 T·m −5%
Xmax17.5 mm +94%, better
Sensitivity95.3 dB −1.1
Eighteen Sound21NLW4000
£608.33Fs29 Hz −10%
Qts0.37 +16%, worse
Vas305 L +10%, worse
BL30 T·m −11%, worse
Xmax15 mm +67%, better
Sensitivity94.9 dB −1.5
Eighteen Sound21NLW9601
£623.80Fs37 Hz +15%, worse
Qts0.29 −9%
Vas175 L −37%, better
BL43 T·m +27%, better
Xmax14 mm +56%, better
Sensitivity96.6 dB –
No photo
Precision DevicesPD.2160-1N
£799.00Fs35 Hz +9%
Qts0.30 −6%
Vas177 L −36%, better
BL43 T·m +27%, better
Xmax16 mm +78%, better
Sensitivity95.9 dB −0.5
EminenceNSW6021-124
£916.36Fs31 Hz −5%
Qts0.32 –
Vas224.6 L −19%, better
BL30.5 T·m −10%
Xmax21 mm +133%, better
Sensitivity95 dB −1.4
Eighteen Sound21NLW5300
No current priceFs31 Hz −4%
Qts0.32 –
Vas325 L +17%, worse
BL31 T·m −8%
Xmax15.3 mm +70%, better
Sensitivity96.6 dB –
No current price
Fs35 Hz +9%
Qts0.34 +6%
Vas266 L −4%
BL31.3 T·m −8%
Xmax14 mm +56%, better
Sensitivity97.1 dB +0.7
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +9%
Qts0.34 +6%
Vas266 L −4%
BL31.3 T·m −8%
Xmax14 mm +56%, better
Sensitivity97.1 dB +0.7
Sica21 S 4 PL
No current priceFs35 Hz +7%
Qts0.30 −6%
Vas255 L −8%
BL36.1 T·m +7%
Xmax5.2 mm −42%, worse
Sensitivity97.4 dB +1
No current price
Fs33 Hz –
Qts0.36 +12%, worse
Vas241 L −13%, better
BL30 T·m −11%, worse
Xmax14 mm +56%, better
Sensitivity95.7 dB −0.7
Eighteen Sound21LW2500
No current priceFs29 Hz −10%
Qts0.37 +16%, worse
Vas305 L +10%, worse
BL30 T·m −11%, worse
Xmax14 mm +56%, better
Sensitivity94.9 dB −1.5
Eighteen Sound21NLW9601C
No current priceFs38 Hz +18%, worse
Qts0.29 −9%
Vas140 L −49%, better
BL33.2 T·m –
Xmax14 mm +56%, better
Sensitivity96 dB –
B&C21SW150
No current priceFs29 Hz −10%
Qts0.26 −19%, better
Vas254 L −8%
BL32.6 T·m −4%
Xmax15 mm +67%, better
Sensitivity95.6 dB −0.8
Dayton AudioPSS545HE-4
No current priceFs29 Hz −11%, better
Qts0.27 −16%, better
Vas212.2 L −23%, better
BL35.5 T·m +5%
Xmax21 mm +133%, better
Sensitivity94.6 dB −1.8
P.AudioSD21-125XB
No current priceFs35 Hz +9%
Qts0.38 +19%, worse
Vas345.6 L +25%, worse
BL30.4 T·m −10%, worse
Xmax11.3 mm +25%, better
Sensitivity97.7 dB +1.3
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Lean Audio | £449.00 | Out of stock | Visit shop at Lean Audio | |
Lean Business | £449.00 | Out of stock | Visit shop at Lean Business |