Dayton AudioPSS555-8
£194.48 · 57% less, betterFs28 Hz –
Qts0.33 −11%, better
Vas444 L +15%, worse
BL29.7 T·m –
Xmax11 mm −21%, worse
Sensitivity96.4 dB +1
21-inch LF driver · 114 mm voice coil · 2,000 W
RCF LF21X451 8Ω
8 Ω · 28–1000 Hz
£448.61
SteadyBlue Aran · 2 in stock · All 2 offers
- Fs
- 28Hz
- Xmax
- 14mm
- SPL
- 95dB
- Pe
- 2000W
- BL
- 30.5T·m
- Vd
- 2380cm³
- Qts
- 0.37
- Vas
- 385L
RCF LF21X451 is a 21-inch 8 ohm LF driver rated at 2000 W RMS. The validated T/S data includes Fs 28 Hz, Qts 0.37, Vas 385 L, Xmax 14 mm, sensitivity 95.4 dB, plus 2380 cm³ Vd and 72 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 £448.61.
The published T/S values agree with each other
Thiele/Small
- Fs
- 28Hz
- Qts
- 0.37
- Qes
- 0.39
- Qms
- 6.9
- Vas
- 385L
- Re
- 5.4Ω
- Le
- 2.90mH
Motor and cone
- BL
- 30.5T·m
- Sd
- 1700cm²
- Mms
- 355g
- Xmax
- 14mm
- Vd †
- 2380cm³
- Voice coil
- 114mm
Power and response
- Sensitivity †
- 95.4dB
- Manufacturer sensitivity
- 97dB
- Power
- 2000W
- Impedance
- 8Ω
- Min. impedance
- 6.7Ω
- Range
- 28–1000Hz
- EBP †
- 72 · Sealed or vented
Size and mounting
- Diameter
- 547mm
- Cutout
- 512mm
- Bolt circle
- 527mm
- Weight
- 15.5kg
Other published values
- Xmech
- 54
- Power Program
- 4000
Sensitivity shows 95.4 dB, calculated from the T/S values. RCF publishes 97.0 dB, 1.6 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else RCF lists
LF · Primary · 21″
- BL
- 30.5T·m
- Fs
- 28Hz
- Le
- 2.90mH
- Re
- 5.4Ω
- Sd
- 1700cm²
- Mms
- 355g
- Qes
- 0.39
- Qms
- 6.9
- Qts
- 0.37
- SPL
- 95.4dB
- Vas
- 385L
- Xmax
- 14mm
- Xmech
- 54
- Power
- 2000W
- Impedance
- 8Ω
- Sensitivity
- 97dB
- Low limit
- 28Hz
- Power Program
- 4000
- Calculated sensitivity †
- 95.4dB
- High limit
- 1000Hz
- Manufacturer sensitivity
- 97dB
- Min. impedance
- 6.7Ω
- Voice coil
- 114mm
- Weight
- 15.5kg
- Diameter
- 547mm
- Cutout
- 512mm
- Bolt circle
- 527mm
02
Compare
Same-size drivers, compared with the LF21X451. Clear differences are green when better and red when worse.
This driverLF21X451
Best price
£448.61
Fs
28 Hz
Qts
0.37
Vas
385 L
BL
30.5 T·m
Xmax
14 mm
Sensitivity
95.4 dB
Power
2000 W
SB AudienceNERO-21SW1100D
£343.60 · 23% less, betterFs32 Hz +14%, worse
Qts0.34 −8%
Vas312.6 L −19%, better
BL30 T·m –
Xmax12.2 mm −13%, worse
Sensitivity96.7 dB +1.3
Eighteen Sound21LW2600
£425.60 · 5% less, betterFs27 Hz −4%
Qts0.33 −11%, better
Vas333 L −14%, better
BL32.5 T·m +7%
Xmax14.6 mm +4%
Sensitivity94.9 dB −0.5
CelestionTSQ2145
£445.00 · Same priceFs30 Hz +7%
Qts0.34 −7%
Vas253.8 L −34%, better
BL33.8 T·m +11%, better
Xmax15 mm +7%
Sensitivity94.8 dB −0.6
Eighteen Sound21NLW4100
£456.79 · 2% moreFs36 Hz +29%, worse
Qts0.46 +24%, worse
Vas210 L −45%, better
BL29.4 T·m −4%
Xmax15.2 mm +9%
Sensitivity95 dB –
B&C21SW115
£458.85 · 2% moreFs30 Hz +7%
Qts0.37 –
Vas318 L −17%, better
BL30.1 T·m –
Xmax14 mm –
Sensitivity95.5 dB –
Beyma21LEX1600ND
£475.00 · 6% more, worseFs30 Hz +7%
Qts0.29 −22%, better
Vas305 L −21%, better
BL36.6 T·m +20%, better
Xmax14 mm –
Sensitivity96.4 dB +1
RCFLF21N451
£475.00 · 6% more, worseFs30 Hz +7%
Qts0.26 −30%, better
Vas375 L –
BL34.5 T·m +13%, better
Xmax13 mm −7%
Sensitivity97.8 dB +2.4, better
B&C21DS115
£475.59 · 6% more, worseFs34 Hz +21%, worse
Qts0.27 −27%, better
Vas204 L −47%, better
BL39.3 T·m +29%, better
Xmax16.5 mm +18%, better
Sensitivity96.6 dB +1.2
Beyma21QLEX1600FE
£493.97 · 10% more, worseFs30 Hz +7%
Qts0.28 −24%, better
Vas309 L −20%, better
BL36.4 T·m +19%, better
Xmax13 mm −7%
Sensitivity96.5 dB +1.1
B&C21SW152
£537.55 · 20% more, worseFs32 Hz +14%, worse
Qts0.36 –
Vas200 L −48%, better
BL39 T·m +28%, better
Xmax15 mm +7%
Sensitivity94.4 dB −1
Eighteen Sound21LW1400
£543.74 · 21% more, worseFs28 Hz –
Qts0.24 −35%, better
Vas385 L –
BL33.5 T·m +10%
Xmax9.5 mm −32%, worse
Sensitivity97.5 dB +2.1, better
Eighteen Sound21NLW9001
£549.89 · 23% more, worseFs32 Hz +14%, worse
Qts0.31 −16%, better
Vas244 L −37%, better
BL37 T·m +21%, better
Xmax14 mm –
Sensitivity95.7 dB –
No photo
Precision DevicesPD.2155-1N
£555.00 · 24% more, worseFs33 Hz +18%, worse
Qts0.36 –
Vas241 L −37%, better
BL30 T·m –
Xmax14 mm –
Sensitivity95.7 dB –
Eighteen Sound21NTLW5000
£595.00 · 33% more, worseFs31 Hz +11%, worse
Qts0.36 –
Vas270 L −30%, better
BL32 T·m +5%
Xmax17.5 mm +25%, better
Sensitivity95.3 dB –
Eighteen Sound21NLW4000
£608.33 · 36% more, worseFs29 Hz +4%
Qts0.37 –
Vas305 L −21%, better
BL30 T·m –
Xmax15 mm +7%
Sensitivity94.9 dB −0.5
Eighteen Sound21NLW9601
£623.80 · 39% more, worseFs37 Hz +32%, worse
Qts0.29 −22%, better
Vas175 L −55%, better
BL43 T·m +41%, better
Xmax14 mm –
Sensitivity96.6 dB +1.2
No photo
Precision DevicesPD.2160-1N
£799.00 · 78% more, worseFs35 Hz +25%, worse
Qts0.30 −19%, better
Vas177 L −54%, better
BL43 T·m +41%, better
Xmax16 mm +14%, better
Sensitivity95.9 dB +0.5
EminenceNSW6021-124
£916.36 · 104% more, worseFs31 Hz +10%
Qts0.32 −14%, better
Vas224.6 L −42%, better
BL30.5 T·m –
Xmax21 mm +50%, better
Sensitivity95 dB –
Eighteen Sound21LW2500
No current priceFs29 Hz +4%
Qts0.37 –
Vas305 L −21%, better
BL30 T·m –
Xmax14 mm –
Sensitivity94.9 dB −0.5
No current price
Fs33 Hz +18%, worse
Qts0.36 –
Vas241 L −37%, better
BL30 T·m –
Xmax14 mm –
Sensitivity95.7 dB –
P.AudioSD21-125XB
No current priceFs35 Hz +25%, worse
Qts0.38 –
Vas345.6 L −10%, better
BL30.4 T·m –
Xmax11.3 mm −20%, worse
Sensitivity97.7 dB +2.3, better
No current price
Fs35 Hz +25%, worse
Qts0.34 −8%
Vas266 L −31%, better
BL31.3 T·m –
Xmax14 mm –
Sensitivity97.1 dB +1.7
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +25%, worse
Qts0.34 −8%
Vas266 L −31%, better
BL31.3 T·m –
Xmax14 mm –
Sensitivity97.1 dB +1.7
Eighteen Sound21NLW5300
No current priceFs31 Hz +11%, worse
Qts0.32 −14%, better
Vas325 L −16%, better
BL31 T·m –
Xmax15.3 mm +9%
Sensitivity96.6 dB +1.2
Eighteen Sound21NLW9601C
No current priceFs38 Hz +36%, worse
Qts0.29 −22%, better
Vas140 L −64%, better
BL33.2 T·m +9%
Xmax14 mm –
Sensitivity96 dB +0.6
CelestionNTR21-5010JD
No current priceFs32 Hz +15%, worse
Qts0.32 −14%, better
Vas276.7 L −28%, better
BL33.9 T·m +11%, better
Xmax9 mm −36%, worse
Sensitivity96.4 dB +1
B&C21SW150
No current priceFs29 Hz +4%
Qts0.26 −30%, better
Vas254 L −34%, better
BL32.6 T·m +7%
Xmax15 mm +7%
Sensitivity95.6 dB –
Sica21 S 4 PL
No current priceFs35 Hz +24%, worse
Qts0.30 −19%, better
Vas255 L −34%, better
BL36.1 T·m +18%, better
Xmax5.2 mm −63%, worse
Sensitivity97.4 dB +2, better
Eighteen Sound21ID
No current priceFs38 Hz +36%, worse
Qts0.23 −38%, better
Vas143 L −63%, better
BL25.2 T·m −17%, worse
Xmax14 mm –
Sensitivity97.2 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
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Blue Aran | £448.61, the lowest price | 2 in stock | Visit shop at Blue Aran | |
Audio Video Parts Import VAT and duty may apply | £377.48 | Special order | Visit shop at Audio Video Parts |
Best price over time
Tracked since 1 Apr
Recent changes
- 12 SepBlue Aran£389.00 → £448.61Up 15% from £389.00