- Net volume
- 200L
- Tuning
- 40Hz
B&C gives the volume and tuning; the port is sized for the driver when you open it.
21-inch LF driver · 21IPAL series · 153 mm voice coil · 2,500 W
B&C 21IPAL 1Ω
1 Ω · 37–1000 Hz
£863.28
SteadyBlue Aran · 2 in stock · All 3 offers
- Fs
- 37Hz
- Xmax
- 22mm
- SPL
- 98dB
- Pe
- 2500W
- BL
- 19.1T·m
- Vd
- 3696cm³
- Qts
- 0.21
- Vas
- 155L
Published graphs
B&C 21IPAL is a 21-inch 1 ohm LF driver rated at 2500 W RMS. The validated T/S data includes Fs 37 Hz, Qts 0.21, Vas 155 L, Xmax 22 mm, sensitivity 97.6 dB, plus 3696 cm³ Vd and 168 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 £863.28.
The published T/S values agree with each other
Thiele/Small
- Fs
- 37Hz
- Qts
- 0.21
- Qes
- 0.22
- Qms
- 4.9
- Vas
- 155L
- Re
- 0.7Ω
- Le
- 0.50mH
Motor and cone
- BL
- 19.1T·m
- Sd
- 1680cm²
- Mms
- 487g
- Xmax
- 22mm
- Vd †
- 3696cm³
- Voice coil
- 153mm
- Flux density
- 1.35T
Power and response
- Sensitivity †
- 97.6dB
- Manufacturer sensitivity
- 99dB
- Power
- 2500W
- Nominal power
- 2500W
- Impedance
- 1Ω
- Min. impedance
- 1.1Ω
- Range
- 37–1000Hz
- EBP †
- 168 · Leans vented
Size and mounting
- Diameter
- 547mm
- Cutout
- 508mm
- Bolt circle
- 527mm
- Depth
- 269mm
- Weight
- 23kg
Sensitivity shows 97.6 dB, calculated from the T/S values. B&C publishes 99.0 dB, 1.4 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 19.1T·m
- Fs
- 37Hz
- Le
- 0.50mH
- Re
- 0.7Ω
- Sd
- 1680cm²
- Mms
- 487g
- Qes
- 0.22
- Qms
- 4.9
- Qts
- 0.21
- SPL
- 97.6dB
- Vas
- 155L
- Xmax
- 22mm
- Power
- 2500W
- Impedance
- 1Ω
- Flux density
- 1.35T
- Sensitivity
- 99dB
- Low limit
- 37Hz
- Nominal power
- 2500W
- Calculated sensitivity †
- 97.6dB
- High limit
- 1000Hz
- Manufacturer sensitivity
- 99dB
- Min. impedance
- 1.1Ω
- Voice coil
- 153mm
- Weight
- 23kg
- Diameter
- 547mm
- Depth
- 269mm
- Cutout
- 508mm
- Bolt circle
- 527mm
- Bl
- 19.1 Tm
- Fs
- 37 Hz
- Le
- 0.5 mH
- Re
- 0.7 Ω
- Sd
- 1680 cm² (260.4 in²)
- Ebp
- 168 Hz
- Mms
- 487 g
- Qes
- 0.22
- Qms
- 4.9
- Qts
- 0.21
- Vas
- 155 dm³ (5.47 ft³)
- Η0
- 3.2 %
- Cone
- RCK21IPAL
- Xmax
- 22 mm
- Xvar
- 15 mm
- Depth
- 269 mm (10.59 in)
- Spider
- Double Silicone
- Cone shape
- Radial
- Net weight
- 23 kg (50.71 lb)
- Pole design
- T-Pole
- Sensitivity
- 99 dB
- Flux density
- 1.35 T
- Shipping box
- 570x570x320 mm (22.44x22.44x12.60 in)
- Winding depth
- 48 mm (1.9 in)
- Shipping units
- 1 pcs
- Surround shape
- Triple Roll
- Former material
- Glass Fibre
- Frequency range
- 37 Hz - 1000 Hz
- Magnet material
- Neodymium Inside Slug
- Shipping weight
- 25.3 kg (55.78 lb)
- Nominal diameter
- 530 mm (21 in)
- Overall diameter
- 547 mm (21.5 in)
- Winding material
- Aluminium
- Minimum impedance
- 1.1 Ω
- Nominal impedance
- 1 Ω
- Magnetic gap depth
- 18 mm (0.7 in)
- Recommended tuning
- 40 Hz
- Voice coil diameter
- 153 mm (6 in)
- Bolt circle diameter
- 527 mm (20.7 in)
- Recommended enclosure
- 200 dm³ (7.06 ft³)
- Woofer cone treatment
- TWP Waterproof Both Sides
- Baffle cutout diameter
- 508 mm (20 in)
- Nominal power handling
- 2500 W
- Continuous power handling
- 5000 W
- Flange and gasket thickness
- 13 mm (0.51 in)
- Air volume occupied by driver
- 16 dm³ (0.56 ft³)
02
Designs
Cabinets for the 21IPAL: a suggested box from B&C and plans builders have published.
All 21IPAL designsHow we find designs03
Compare
Same-size drivers, compared with the 21IPAL. Clear differences are green when better and red when worse.
This driver21IPAL
Best price
£863.28
Fs
37 Hz
Qts
0.21
Vas
155 L
BL
19.1 T·m
Xmax
22 mm
Sensitivity
97.6 dB
Power
2500 W
SB AudienceROSSO-21SW800
£423.44 · 51% less, betterFs38 Hz –
Qts0.76 +262%, worse
Vas224.4 L +45%, worse
BL24.1 T·m +26%, better
Xmax11.4 mm −48%, worse
Sensitivity93.9 dB −3.7, worse
Beyma21QLEX1600FE
£425.00 · 51% less, betterFs30 Hz −19%, better
Qts0.28 +33%, worse
Vas309 L +99%, worse
BL36.4 T·m +91%, better
Xmax13 mm −41%, worse
Sensitivity96.5 dB −1.1
Dayton AudioHTS545HE-4
£454.29 · 47% less, betterFs26 Hz −29%, better
Qts0.28 +33%, worse
Vas179 L +15%, worse
BL38.2 T·m +100%, better
Xmax21 mm −5%
Sensitivity92.5 dB −5.1, worse
RCFLF21N451
£475.00 · 45% less, betterFs30 Hz −19%, better
Qts0.26 +24%, worse
Vas375 L +142%, worse
BL34.5 T·m +81%, better
Xmax13 mm −41%, worse
Sensitivity97.8 dB –
Beyma21LEX1600ND
£475.00 · 45% less, betterFs30 Hz −19%, better
Qts0.29 +38%, worse
Vas305 L +97%, worse
BL36.6 T·m +92%, better
Xmax14 mm −36%, worse
Sensitivity96.4 dB −1.2
LavoceSAN214.50
£481.92 · 44% less, betterFs33 Hz −11%, better
Qts0.28 +33%, worse
Vas218.3 L +41%, worse
BL39.6 T·m +107%, better
Xmax15.4 mm −30%, worse
Sensitivity96.4 dB −1.2
B&C21SW115
£481.92 · 44% less, betterFs33 Hz −11%, better
Qts0.36 +71%, worse
Vas278 L +79%, worse
BL24.8 T·m +30%, better
Xmax14 mm −36%, worse
Sensitivity96.3 dB −1.3
B&C21DS115
£490.39 · 43% less, betterFs32 Hz −14%, better
Qts0.21 –
Vas219 L +41%, worse
BL28.6 T·m +50%, better
Xmax15 mm −32%, worse
Sensitivity97.2 dB –
Eighteen Sound21NLW4100
£512.25 · 41% less, betterFs34 Hz −8%
Qts0.40 +90%, worse
Vas219 L +41%, worse
BL22.8 T·m +19%, better
Xmax15.2 mm −31%, worse
Sensitivity95.1 dB −2.5, worse
Eighteen Sound21LW1400
£550.00 · 36% less, betterFs28 Hz −24%, better
Qts0.24 +14%, worse
Vas385 L +148%, worse
BL33.5 T·m +75%, better
Xmax9.5 mm −57%, worse
Sensitivity97.5 dB –
B&C21SW152
£585.00 · 32% less, betterFs32 Hz −14%, better
Qts0.30 +43%, worse
Vas200 L +29%, worse
BL32.5 T·m +70%, better
Xmax15 mm −32%, worse
Sensitivity95.3 dB −2.3, worse
Eighteen Sound21NLW9001
£594.65 · 31% less, betterFs31 Hz −16%, better
Qts0.34 +62%, worse
Vas272 L +75%, worse
BL23.8 T·m +25%, better
Xmax14 mm −36%, worse
Sensitivity95.4 dB −2.2, worse
Eighteen Sound21NTLW5000
£595.00 · 31% less, betterFs30 Hz −19%, better
Qts0.32 +52%, worse
Vas300 L +94%, worse
BL25 T·m +31%, better
Xmax17.5 mm −20%, worse
Sensitivity95.9 dB −1.7
Eighteen Sound21NLW9601
£630.98 · 27% less, betterFs37 Hz –
Qts0.29 +38%, worse
Vas175 L +13%, worse
BL43 T·m +125%, better
Xmax14 mm −36%, worse
Sensitivity96.6 dB −1
EminenceNSW6021-6
£800.00 · 7% less, betterFs29 Hz −22%, better
Qts0.31 +48%, worse
Vas224.6 L +45%, worse
BL33.8 T·m +77%, better
Xmax21 mm −5%
Sensitivity94.5 dB −3.1, worse
No photo
Precision DevicesPD.2160-1N
£811.00 · 6% less, betterFs35 Hz −5%
Qts0.30 +43%, worse
Vas177 L +14%, worse
BL43 T·m +125%, better
Xmax16 mm −27%, worse
Sensitivity95.9 dB −1.7
FaitalPRO21XL3000
£888.46 · 3% moreFs32 Hz −14%, better
Qts0.22 +5%
Vas223.5 L +44%, worse
BL35.5 T·m +86%, better
Xmax17.7 mm −20%, worse
Sensitivity97.3 dB –
EminenceNSW6021-124
£927.53 · 7% more, worseFs31 Hz −17%, better
Qts0.32 +52%, worse
Vas224.6 L +45%, worse
BL30.5 T·m +60%, better
Xmax21 mm −5%
Sensitivity95 dB −2.6, worse
Eighteen Sound21ID
No current priceFs38 Hz –
Qts0.23 +10%
Vas143 L −8%
BL25.2 T·m +32%, better
Xmax14 mm −36%, worse
Sensitivity97.2 dB –
Dayton AudioPSS545HE-4
No current priceFs29 Hz −22%, better
Qts0.27 +29%, worse
Vas212.2 L +37%, worse
BL35.5 T·m +86%, better
Xmax21 mm −5%
Sensitivity94.6 dB −3, worse
CelestionTSQ2160
No current priceFs30 Hz −19%, better
Qts0.26 +22%, worse
Vas234.8 L +51%, worse
BL43.1 T·m +126%, better
Xmax18.8 mm −15%, worse
Sensitivity95.8 dB −1.8
Eighteen Sound21NLW9601C
No current priceFs38 Hz –
Qts0.29 +38%, worse
Vas140 L −10%
BL33.2 T·m +74%, better
Xmax14 mm −36%, worse
Sensitivity96 dB −1.6
Eighteen Sound21LW2600
No current priceFs27 Hz −27%, better
Qts0.29 +38%, worse
Vas332 L +114%, worse
BL24.9 T·m +30%, better
Xmax14.6 mm −34%, worse
Sensitivity95.6 dB −2, worse
No current price
Fs33 Hz −11%, better
Qts0.36 +71%, worse
Vas241 L +55%, worse
BL30 T·m +57%, better
Xmax14 mm −36%, worse
Sensitivity95.7 dB −1.9
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz −11%, better
Qts0.36 +71%, worse
Vas241 L +55%, worse
BL30 T·m +57%, better
Xmax14 mm −36%, worse
Sensitivity95.7 dB −1.9
BishopSoundBWN21/4
No current priceFs29 Hz −22%, better
Qts0.42 +99%, worse
Vas244.2 L +58%, worse
BL32.6 T·m +71%, better
Xmax15 mm −32%, worse
Sensitivity93.2 dB −4.4, worse
BishopSoundBWN21/8
No current priceFs29 Hz −22%, better
Qts0.42 +99%, worse
Vas244.2 L +58%, worse
BL32.6 T·m +71%, better
Xmax15 mm −32%, worse
Sensitivity93.2 dB −4.4, worse
Eighteen Sound21NLW5300
No current priceFs31 Hz −16%, better
Qts0.32 +52%, worse
Vas325 L +110%, worse
BL31 T·m +62%, better
Xmax15.3 mm −30%, worse
Sensitivity96.6 dB −1
No current price
Fs35 Hz −5%
Qts0.34 +61%, worse
Vas266 L +72%, worse
BL31.3 T·m +64%, better
Xmax14 mm −36%, worse
Sensitivity97.1 dB −0.5
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz −5%
Qts0.34 +61%, worse
Vas266 L +72%, worse
BL31.3 T·m +64%, better
Xmax14 mm −36%, worse
Sensitivity97.1 dB −0.5
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 | £863.28, the lowest price | 2 in stock | Visit shop at Blue Aran | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £1,019.10 | 18% above the lowest price | In stock | Visit shop at JP Leisure |
JP Leisure | £1,019.10 | 18% above the lowest price | In stock | Visit shop at JP Leisure |
Best price over time
Tracked since 1 Apr
Recent changes
- 23 JunJP Leisure£1,015.85 → £1,019.10Up 0.3% from £1,015.85
- 5 JunBlue Aran£750.00 → £863.28Up 15% from £750.00