- Net volume
- 190L
- Tuning
- 33Hz
B&C gives the volume and tuning; the port is sized for the driver when you open it.
21-inch LF driver · 21SW series · 153 mm voice coil · 2,000 W
B&C 21SW152 4Ω
30–1000 Hz
£585.00
SteadyBlue Aran · 2 in stock · All 8 offers
- Fs
- 32Hz
- Xmax
- 15mm
- SPL
- 95dB
- Pe
- 2000W
- BL
- 32.5T·m
- Vd
- 2520cm³
- Qts
- 0.30
- Vas
- 200L
Published graphs
B&C 21SW152 is a 21-inch 4 ohm LF driver rated at 2000 W RMS. The validated T/S data includes Fs 32 Hz, Qts 0.30, Vas 200 L, Xmax 15 mm, sensitivity 95.3 dB, plus 2520 cm³ Vd and 103 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 £585.00.
The published T/S values agree with each other
Thiele/Small
- Fs
- 32Hz
- Qts
- 0.30
- Qes
- 0.31
- Qms
- 7
- Vas
- 200L
- Re
- 3.3Ω
- Le
- 1.50mH
Motor and cone
- BL
- 32.5T·m
- Sd
- 1680cm²
- Mms
- 460g
- Xmax
- 15mm
- Vd †
- 2520cm³
- Voice coil
- 153mm
- Flux density
- 1.20T
Power and response
- Sensitivity †
- 95.3dB
- Manufacturer sensitivity
- 96dB
- Power
- 2000W
- Nominal power
- 2000W
- Impedance
- 4Ω
- Min. impedance
- 4.2Ω
- Range
- 30–1000Hz
- EBP †
- 103 · Leans vented
Size and mounting
- Diameter
- 547mm
- Cutout
- 508mm
- Bolt circle
- 527mm
- Depth
- 261mm
- Weight
- 18.5kg
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 32.5T·m
- Fs
- 32Hz
- Le
- 1.50mH
- Re
- 3.3Ω
- Sd
- 1680cm²
- Mms
- 460g
- Qes
- 0.31
- Qms
- 7
- Qts
- 0.30
- SPL
- 95.3dB
- Vas
- 200L
- Xmax
- 15mm
- Power
- 2000W
- Impedance
- 4Ω
- Flux density
- 1.20T
- Sensitivity
- 96dB
- Low limit
- 30Hz
- Nominal power
- 2000W
- Calculated sensitivity †
- 95.3dB
- High limit
- 1000Hz
- Manufacturer sensitivity
- 96dB
- Min. impedance
- 4.2Ω
- Voice coil
- 153mm
- Weight
- 18.5kg
- Diameter
- 547mm
- Depth
- 261mm
- Cutout
- 508mm
- Bolt circle
- 527mm
- Bl
- 32.5 Tm
- Fs
- 32 Hz
- Le
- 1.5 mH
- Re
- 3.3 Ω
- Sd
- 1680 cm² (260.4 in²)
- Ebp
- 103 Hz
- Mms
- 460 g
- Qes
- 0.31
- Qms
- 7
- Qts
- 0.3
- Vas
- 200 dm³ (7 ft³)
- Η0
- 2.2 %
- Cone
- RCK21SW1524
- Xmax
- 15 mm
- Xvar
- 16 mm
- Depth
- 261 mm (10.3 in)
- Spider
- Double Silicone
- Cone shape
- Radial
- Net weight
- 18.5 kg (40.7 lb)
- Pole design
- T-Pole
- Sensitivity
- 96 dB
- Flux density
- 1.2 T
- Shipping box
- 570x570x320 mm (22.44x22.44x12.60 in)
- Winding depth
- 30 mm (1.18 in)
- Shipping units
- 1 pcs
- Surround shape
- Triple Roll
- Former material
- Glass Fibre
- Frequency range
- 30 Hz - 1000 Hz
- Magnet material
- Neodymium Inside Slug
- Shipping weight
- 20.8 kg (45.86 lb)
- Nominal diameter
- 530 mm (21 in)
- Overall diameter
- 547 mm (21.5 in)
- Winding material
- Copper
- Minimum impedance
- 4.2 Ω
- Nominal impedance
- 4 Ω
- Magnetic gap depth
- 12 mm (0.5 in)
- Recommended tuning
- 33 Hz
- Voice coil diameter
- 153 mm (6 in)
- Bolt circle diameter
- 527 mm (20.7 in)
- Recommended enclosure
- 190 dm³ (6.71 ft³)
- Woofer cone treatment
- TWP Waterproof Both Sides
- Baffle cutout diameter
- 508 mm (20 in)
- Nominal power handling
- 2000 W
- Continuous power handling
- 4000 W
- Flange and gasket thickness
- 16 mm (0.63 in)
- Air volume occupied by driver
- 16 dm³ (0.56 ft³)
02
Designs
Cabinets for the 21SW152: a suggested box from B&C and plans builders have published.
All 21SW152 designsHow we find designs03
Compare
Same-size drivers, compared with the 21SW152. Clear differences are green when better and red when worse.
This driver21SW152
Best price
£585.00
Fs
32 Hz
Qts
0.30
Vas
200 L
BL
32.5 T·m
Xmax
15 mm
Sensitivity
95.3 dB
Power
2000 W
Dayton AudioPSS555-8
£196.85 · 66% less, betterFs28 Hz −14%, better
Qts0.33 +10%, worse
Vas444 L +122%, worse
BL29.7 T·m −9%
Xmax11 mm −27%, worse
Sensitivity96.4 dB +1.1
SB AudienceNERO-21SW1100D
£343.60 · 41% less, betterFs32 Hz –
Qts0.34 +13%, worse
Vas312.6 L +56%, worse
BL30 T·m −8%
Xmax12.2 mm −19%, worse
Sensitivity96.7 dB +1.4
Beyma21QLEX1600FE
£425.00 · 27% less, betterFs30 Hz −6%
Qts0.28 −7%
Vas309 L +55%, worse
BL36.4 T·m +12%, better
Xmax13 mm −13%, worse
Sensitivity96.5 dB +1.2
CelestionTSQ2145
£445.00 · 24% less, betterFs30 Hz −6%
Qts0.34 +15%, worse
Vas253.8 L +27%, worse
BL33.8 T·m +4%
Xmax15 mm –
Sensitivity94.8 dB −0.5
Dayton AudioHTS545HE-4
£454.29 · 22% less, betterFs26 Hz −18%, better
Qts0.28 −7%
Vas179 L −11%, better
BL38.2 T·m +18%, better
Xmax21 mm +40%, better
Sensitivity92.5 dB −2.8, worse
Beyma21LEX1600ND
£475.00 · 19% less, betterFs30 Hz −6%
Qts0.29 −3%
Vas305 L +53%, worse
BL36.6 T·m +13%, better
Xmax14 mm −7%
Sensitivity96.4 dB +1.1
RCFLF21N451
£475.00 · 19% less, betterFs30 Hz −6%
Qts0.26 −13%, better
Vas375 L +88%, worse
BL34.5 T·m +6%
Xmax13 mm −13%, worse
Sensitivity97.8 dB +2.5, better
LavoceSAN214.50
£481.92 · 18% less, betterFs33 Hz +3%
Qts0.28 −7%
Vas218.3 L +9%
BL39.6 T·m +22%, better
Xmax15.4 mm –
Sensitivity96.4 dB +1.1
B&C21SW115
£481.92 · 18% less, betterFs33 Hz +3%
Qts0.36 +20%, worse
Vas278 L +39%, worse
BL24.8 T·m −24%, worse
Xmax14 mm −7%
Sensitivity96.3 dB +1
B&C21DS115
£490.39 · 16% less, betterFs32 Hz –
Qts0.21 −30%, better
Vas219 L +10%
BL28.6 T·m −12%, worse
Xmax15 mm –
Sensitivity97.2 dB +1.9
Eighteen Sound21NLW9001
£594.65 · 2% moreFs31 Hz −3%
Qts0.34 +13%, worse
Vas272 L +36%, worse
BL23.8 T·m −27%, worse
Xmax14 mm −7%
Sensitivity95.4 dB –
Eighteen Sound21NTLW5000
£595.00 · 2% moreFs30 Hz −6%
Qts0.32 +7%
Vas300 L +50%, worse
BL25 T·m −23%, worse
Xmax17.5 mm +17%, better
Sensitivity95.9 dB +0.6
Eighteen Sound21NLW9601
£600.74 · 3% moreFs41 Hz +28%, worse
Qts0.32 +7%
Vas123 L −39%, better
BL32.7 T·m –
Xmax14 mm −7%
Sensitivity96.1 dB +0.8
EminenceNSW6021-6
£800.00 · 37% more, worseFs29 Hz −9%
Qts0.31 +3%
Vas224.6 L +12%, worse
BL33.8 T·m +4%
Xmax21 mm +40%, better
Sensitivity94.5 dB −0.8
No photo
Precision DevicesPD.2160-1N
£811.00 · 39% more, worseFs35 Hz +9%
Qts0.30 –
Vas177 L −12%, better
BL43 T·m +32%, better
Xmax16 mm +7%
Sensitivity95.9 dB +0.6
FaitalPRO21XL3000
£888.46 · 52% more, worseFs32 Hz –
Qts0.22 −27%, better
Vas223.5 L +12%, worse
BL35.5 T·m +9%
Xmax17.7 mm +18%, better
Sensitivity97.3 dB +2, better
EminenceNSW6021-124
£927.53 · 59% more, worseFs31 Hz −4%
Qts0.32 +7%
Vas224.6 L +12%, worse
BL30.5 T·m −6%
Xmax21 mm +40%, better
Sensitivity95 dB –
Eighteen Sound21NLW9601C
No current priceFs38 Hz +19%, worse
Qts0.29 −3%
Vas140 L −30%, better
BL33.2 T·m –
Xmax14 mm −7%
Sensitivity96 dB +0.7
Eighteen Sound21NLW5300
No current priceFs31 Hz −3%
Qts0.32 +7%
Vas325 L +63%, worse
BL31 T·m −5%
Xmax15.3 mm –
Sensitivity96.6 dB +1.3
No current price
Fs35 Hz +9%
Qts0.34 +13%, worse
Vas266 L +33%, worse
BL31.3 T·m −4%
Xmax14 mm −7%
Sensitivity97.1 dB +1.8
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +9%
Qts0.34 +13%, worse
Vas266 L +33%, worse
BL31.3 T·m −4%
Xmax14 mm −7%
Sensitivity97.1 dB +1.8
Sica21 S 4 PL
No current priceFs35 Hz +8%
Qts0.30 –
Vas255 L +28%, worse
BL36.1 T·m +11%, better
Xmax5.2 mm −65%, worse
Sensitivity97.4 dB +2.1, better
Dayton AudioPSS545HE-4
No current priceFs29 Hz −10%
Qts0.27 −10%
Vas212.2 L +6%
BL35.5 T·m +9%
Xmax21 mm +40%, better
Sensitivity94.6 dB −0.7
Eighteen Sound21LW2600
No current priceFs27 Hz −16%, better
Qts0.29 −3%
Vas332 L +66%, worse
BL24.9 T·m −23%, worse
Xmax14.6 mm –
Sensitivity95.6 dB –
No current price
Fs33 Hz +3%
Qts0.36 +20%, worse
Vas241 L +21%, worse
BL30 T·m −8%
Xmax14 mm −7%
Sensitivity95.7 dB –
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz +3%
Qts0.36 +20%, worse
Vas241 L +21%, worse
BL30 T·m −8%
Xmax14 mm −7%
Sensitivity95.7 dB –
CelestionNTR21-5010JD
No current priceFs32 Hz –
Qts0.32 +7%
Vas276.7 L +38%, worse
BL33.9 T·m +4%
Xmax9 mm −40%, worse
Sensitivity96.4 dB +1.1
BishopSoundBWN21/4
No current priceFs29 Hz −9%
Qts0.42 +39%, worse
Vas244.2 L +22%, worse
BL32.6 T·m –
Xmax15 mm –
Sensitivity93.2 dB −2.1, worse
BishopSoundBWN21/8
No current priceFs29 Hz −9%
Qts0.42 +39%, worse
Vas244.2 L +22%, worse
BL32.6 T·m –
Xmax15 mm –
Sensitivity93.2 dB −2.1, worse
Eighteen Sound21ID
No current priceFs38 Hz +19%, worse
Qts0.23 −23%, better
Vas143 L −28%, better
BL25.2 T·m −22%, worse
Xmax14 mm −7%
Sensitivity97.2 dB +1.9
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express5.0 out of 57 ratings · Checked 9 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 |
|---|---|---|---|---|
Blue Aran | £585.00, the lowest price | 2 in stock | Visit shop at Blue Aran | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £587.03 | 0.3% above the lowest price | In stock | Visit shop at JP Leisure |
JP Leisure | £587.03 | 0.3% above the lowest price | In stock | Visit shop at JP Leisure |
Audio Video Parts Import VAT and duty may apply | £507.11 | Special order | Visit shop at Audio Video Parts | |
Parts Express Import VAT and duty may apply | £744.20 | 27% above the lowest price | 8 in stock | Visit shop at Parts Express |
Best price over time
Tracked since 1 Apr
Recent changes
- 17 JulBlue Aran£595.00 → £585.00Down 1.7% from £595.00
- 23 JunJP Leisure£656.00 → £587.03Down 11% from £656.00
- 5 JunBlue Aran£499.00 → £595.00Up 19% from £499.00