Dayton AudioPSS555-8
£194.48 · 59% less, betterFs28 Hz −8%
Qts0.33 +27%, worse
Vas444 L +18%, worse
BL29.7 T·m −14%, worse
Xmax11 mm −15%, worse
Sensitivity96.4 dB −1.4
21-inch LF driver · 114 mm voice coil · 1,500 W
RCF LF21N451 8Ω
8 Ω · 30–1000 Hz
£475.00
28%Blue Aran · 1 in stock · All 4 offers
- Fs
- 30Hz
- Xmax
- 13mm
- SPL
- 98dB
- Pe
- 1500W
- BL
- 34.5T·m
- Vd
- 2210cm³
- Qts
- 0.26
- Vas
- 375L
RCF LF21N451 is a 21-inch 8 ohm LF driver rated at 1500 W RMS. The validated T/S data includes Fs 30 Hz, Qts 0.26, Vas 375 L, Xmax 13 mm, sensitivity 97.8 dB, plus 2210 cm³ Vd and 111 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 £475.00.
The published T/S values agree with each other
Thiele/Small
- Fs
- 30Hz
- Qts
- 0.26
- Qes
- 0.27
- Qms
- 6.1
- Vas
- 375L
- Re
- 5.6Ω
- Le
- 3mH
Motor and cone
- BL
- 34.5T·m
- Sd
- 1700cm²
- Mms
- 315g
- Xmax
- 13mm
- Vd †
- 2210cm³
- Voice coil
- 114mm
Power and response
- Sensitivity †
- 97.8dB
- Manufacturer sensitivity
- 98.5dB
- Power
- 1500W
- Impedance
- 8Ω
- Min. impedance
- 7.1Ω
- Range
- 30–1000Hz
- EBP †
- 111 · Leans vented
Size and mounting
- Diameter
- 547mm
- Cutout
- 512mm
- Bolt circle
- 527mm
- Weight
- 10.9kg
Other published values
- Xmech
- 58
- Power Program
- 3000
† Calculated by bits from the published values
What this validation status means
Everything else RCF lists
LF · Primary · 21″
- BL
- 34.5T·m
- Fs
- 30Hz
- Le
- 3mH
- Re
- 5.6Ω
- Sd
- 1700cm²
- Mms
- 315g
- Qes
- 0.27
- Qms
- 6.1
- Qts
- 0.26
- SPL
- 97.8dB
- Vas
- 375L
- Xmax
- 13mm
- Xmech
- 58
- Power
- 1500W
- Impedance
- 8Ω
- Sensitivity
- 98.5dB
- Low limit
- 30Hz
- Power Program
- 3000
- Calculated sensitivity †
- 97.8dB
- High limit
- 1000Hz
- Manufacturer sensitivity
- 98.5dB
- Min. impedance
- 7.1Ω
- Voice coil
- 114mm
- Weight
- 10.9kg
- Diameter
- 547mm
- Cutout
- 512mm
- Bolt circle
- 527mm
02
Compare
Same-size drivers, compared with the LF21N451. Clear differences are green when better and red when worse.
This driverLF21N451
Best price
£475.00
Fs
30 Hz
Qts
0.26
Vas
375 L
BL
34.5 T·m
Xmax
13 mm
Sensitivity
97.8 dB
Power
1500 W
SB AudienceNERO-21SW1100D
£343.60 · 28% less, betterFs32 Hz +7%
Qts0.34 +31%, worse
Vas312.6 L −17%, better
BL30 T·m −13%, worse
Xmax12.2 mm −6%
Sensitivity96.7 dB −1.1
Eighteen Sound21LW2600
£425.60 · 10% less, betterFs27 Hz −10%, better
Qts0.33 +27%, worse
Vas333 L −11%, better
BL32.5 T·m −6%
Xmax14.6 mm +12%, better
Sensitivity94.9 dB −2.9, worse
CelestionTSQ2145
£445.00 · 6% less, betterFs30 Hz –
Qts0.34 +32%, worse
Vas253.8 L −32%, better
BL33.8 T·m –
Xmax15 mm +15%, better
Sensitivity94.8 dB −3, worse
RCFLF21X451
£448.61 · 6% less, betterFs28 Hz −7%
Qts0.37 +42%, worse
Vas385 L –
BL30.5 T·m −12%, worse
Xmax14 mm +8%
Sensitivity95.4 dB −2.4, worse
Dayton AudioHTS545HE-4
£448.82 · 6% less, betterFs26 Hz −12%, better
Qts0.28 +8%
Vas179 L −52%, better
BL38.2 T·m +11%, better
Xmax21 mm +62%, better
Sensitivity92.5 dB −5.3, worse
B&C21SW115
£458.85 · 3% lessFs30 Hz –
Qts0.37 +42%, worse
Vas318 L −15%, better
BL30.1 T·m −13%, worse
Xmax14 mm +8%
Sensitivity95.5 dB −2.3, worse
Beyma21LEX1600ND
£475.00 · Same priceFs30 Hz –
Qts0.29 +12%, worse
Vas305 L −19%, better
BL36.6 T·m +6%
Xmax14 mm +8%
Sensitivity96.4 dB −1.4
B&C21DS115
£475.59 · Same priceFs34 Hz +13%, worse
Qts0.27 +4%
Vas204 L −46%, better
BL39.3 T·m +14%, better
Xmax16.5 mm +27%, better
Sensitivity96.6 dB −1.2
Beyma21QLEX1600FE
£493.97 · 4% moreFs30 Hz –
Qts0.28 +8%
Vas309 L −18%, better
BL36.4 T·m +6%
Xmax13 mm –
Sensitivity96.5 dB −1.3
Eighteen Sound21LW1400
£543.74 · 14% more, worseFs28 Hz −7%
Qts0.24 −8%
Vas385 L –
BL33.5 T·m –
Xmax9.5 mm −27%, worse
Sensitivity97.5 dB –
Eighteen Sound21NLW9001
£549.89 · 16% more, worseFs32 Hz +7%
Qts0.31 +19%, worse
Vas244 L −35%, better
BL37 T·m +7%
Xmax14 mm +8%
Sensitivity95.7 dB −2.1, worse
No photo
Precision DevicesPD.2155-1N
£555.00 · 17% more, worseFs33 Hz +10%, worse
Qts0.36 +38%, worse
Vas241 L −36%, better
BL30 T·m −13%, worse
Xmax14 mm +8%
Sensitivity95.7 dB −2.1, worse
B&C21SW152
£585.00 · 23% more, worseFs32 Hz +7%
Qts0.30 +15%, worse
Vas200 L −47%, better
BL32.5 T·m −6%
Xmax15 mm +15%, better
Sensitivity95.3 dB −2.5, worse
Eighteen Sound21NLW4000
£608.33 · 28% more, worseFs29 Hz −3%
Qts0.37 +42%, worse
Vas305 L −19%, better
BL30 T·m −13%, worse
Xmax15 mm +15%, better
Sensitivity94.9 dB −2.9, worse
Eighteen Sound21NLW9601
£623.80 · 31% more, worseFs37 Hz +23%, worse
Qts0.29 +12%, worse
Vas175 L −53%, better
BL43 T·m +25%, better
Xmax14 mm +8%
Sensitivity96.6 dB −1.2
No photo
Precision DevicesPD.2160-1N
£799.00 · 68% more, worseFs35 Hz +17%, worse
Qts0.30 +15%, worse
Vas177 L −53%, better
BL43 T·m +25%, better
Xmax16 mm +23%, better
Sensitivity95.9 dB −1.9
FaitalPRO21XL3000
£899.00 · 89% more, worseFs30 Hz –
Qts0.25 −4%
Vas284.6 L −24%, better
BL43 T·m +25%, better
Xmax17.7 mm +36%, better
Sensitivity96.9 dB −0.9
B&C21SW150
No current priceFs29 Hz −3%
Qts0.26 –
Vas254 L −32%, better
BL32.6 T·m −6%
Xmax15 mm +15%, better
Sensitivity95.6 dB −2.2, worse
Dayton AudioPSS545HE-4
No current priceFs29 Hz −4%
Qts0.27 +4%
Vas212.2 L −43%, better
BL35.5 T·m –
Xmax21 mm +62%, better
Sensitivity94.6 dB −3.2, worse
Eighteen Sound21NLW9601C
No current priceFs38 Hz +27%, worse
Qts0.29 +12%, worse
Vas140 L −63%, better
BL33.2 T·m −4%
Xmax14 mm +8%
Sensitivity96 dB −1.8
Sica21 S 4 PL
No current priceFs35 Hz +15%, worse
Qts0.30 +15%, worse
Vas255 L −32%, better
BL36.1 T·m +5%
Xmax5.2 mm −60%, worse
Sensitivity97.4 dB –
Eighteen Sound21NLW5300
No current priceFs31 Hz +3%
Qts0.32 +23%, worse
Vas325 L −13%, better
BL31 T·m −10%, worse
Xmax15.3 mm +18%, better
Sensitivity96.6 dB −1.2
Eighteen Sound21ID
No current priceFs38 Hz +27%, worse
Qts0.23 −12%, better
Vas143 L −62%, better
BL25.2 T·m −27%, worse
Xmax14 mm +8%
Sensitivity97.2 dB −0.6
No current price
Fs35 Hz +17%, worse
Qts0.34 +30%, worse
Vas266 L −29%, better
BL31.3 T·m −9%
Xmax14 mm +8%
Sensitivity97.1 dB −0.7
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +17%, worse
Qts0.34 +30%, worse
Vas266 L −29%, better
BL31.3 T·m −9%
Xmax14 mm +8%
Sensitivity97.1 dB −0.7
P.AudioSD21-125XB
No current priceFs35 Hz +17%, worse
Qts0.38 +46%, worse
Vas345.6 L −8%
BL30.4 T·m −12%, worse
Xmax11.3 mm −13%, worse
Sensitivity97.7 dB –
Eighteen Sound21LW2500
No current priceFs29 Hz −3%
Qts0.37 +42%, worse
Vas305 L −19%, better
BL30 T·m −13%, worse
Xmax14 mm +8%
Sensitivity94.9 dB −2.9, worse
CelestionNTR21-5010JD
No current priceFs32 Hz +7%
Qts0.32 +23%, worse
Vas276.7 L −26%, better
BL33.9 T·m –
Xmax9 mm −31%, worse
Sensitivity96.4 dB −1.4
No current price
Fs33 Hz +10%, worse
Qts0.36 +38%, worse
Vas241 L −36%, better
BL30 T·m −13%, worse
Xmax14 mm +8%
Sensitivity95.7 dB −2.1, worse
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 | £475.00, the lowest price | 1 in stock | Visit shop at Blue Aran | |
Lean Business | £371.37 | Out of stock | Visit shop at Lean Business | |
Audio Video Parts Import VAT and duty may apply | £423.74 | Special order | Visit shop at Audio Video Parts |
Best price over time
Tracked since 1 Apr