- 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 · 150 mm voice coil · 1,500 W
B&C 21SW150 4Ω
4 Ω · 30–1000 Hz
No current price
- Fs
- 29Hz
- Xmax
- 15mm
- SPL
- 96dB
- Pe
- 1500W
- BL
- 32.6T·m
- Vd
- 2520cm³
- Qts
- 0.26
- Vas
- 254L
Published graphs
B&C 21SW150 is a 21-inch 4 ohm LF driver rated at 1500 W RMS. The validated T/S data includes Fs 29 Hz, Qts 0.26, Vas 254 L, Xmax 15 mm, sensitivity 95.6 dB, plus 2520 cm³ Vd and 107 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
- 29Hz
- Qts
- 0.26
- Qes
- 0.27
- Qms
- 8.1
- Vas
- 254L
- Re
- 3Ω
- Le
- 1.30mH
Motor and cone
- BL
- 32.6T·m
- Sd
- 1680cm²
- Mms
- 494g
- Xmax
- 15mm
- Vd †
- 2520cm³
- Voice coil
- 150mm
- Flux density
- 1.20T
Power and response
- Sensitivity †
- 95.6dB
- Manufacturer sensitivity
- 95dB
- Power
- 1500W
- Nominal power
- 1500W
- Impedance
- 4Ω
- Min. impedance
- 4Ω
- Range
- 30–1000Hz
- EBP †
- 107 · Leans vented
Size and mounting
- Diameter
- 547mm
- Cutout
- 508mm
- Bolt circle
- 527mm
- Depth
- 250mm
- Weight
- 18kg
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 32.6T·m
- Fs
- 29Hz
- Le
- 1.30mH
- Re
- 3Ω
- Sd
- 1680cm²
- Mms
- 494g
- Qes
- 0.27
- Qms
- 8.1
- Qts
- 0.26
- SPL
- 95.6dB
- Vas
- 254L
- Xmax
- 15mm
- Power
- 1500W
- Impedance
- 4Ω
- Flux density
- 1.20T
- Sensitivity
- 95dB
- Low limit
- 30Hz
- Nominal power
- 1500W
- Calculated sensitivity †
- 95.6dB
- High limit
- 1000Hz
- Manufacturer sensitivity
- 95dB
- Min. impedance
- 4Ω
- Voice coil
- 150mm
- Weight
- 18kg
- Diameter
- 547mm
- Depth
- 250mm
- Cutout
- 508mm
- Bolt circle
- 527mm
- Bl
- 32.6 Tm
- Fs
- 29 Hz
- Le
- 1.3 mH
- Re
- 3 Ω
- Sd
- 1680 cm² (260.4 in²)
- Ebp
- 107 Hz
- Mms
- 494 g
- Qes
- 0.27
- Qms
- 8.1
- Qts
- 0.26
- Vas
- 254 dm³ (8.9 ft³)
- Η0
- 2 %
- Cone
- RCK21SW1504
- Xmax
- 15 mm
- Xvar
- 16 mm
- Depth
- 250 mm (8.2 in)
- Spider
- Double Silicone
- Cone shape
- Radial
- Net weight
- 18 kg (40 lb)
- Pole design
- T-Pole
- Sensitivity
- 95 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 Ring
- Shipping weight
- 20.3 kg (44.75 lb)
- Nominal diameter
- 530 mm (21 in)
- Overall diameter
- 547 mm (21.5 in)
- Winding material
- Copper
- Minimum impedance
- 4 Ω
- Nominal impedance
- 4 Ω
- Magnetic gap depth
- 12 mm (0.5 in)
- Recommended tuning
- 33 Hz
- Voice coil diameter
- 150 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
- 1500 W
- Continuous power handling
- 3000 W
- Flange and gasket thickness
- 16 mm (0.62 in)
B&C’s suggested box
From B&C’s 21SW150 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 21SW150. Clear differences are green when better and red when worse.
This driver21SW150
Best price
–
Fs
29 Hz
Qts
0.26
Vas
254 L
BL
32.6 T·m
Xmax
15 mm
Sensitivity
95.6 dB
Power
1500 W
Beyma21QLEX1600FE
£425.00Fs30 Hz +3%
Qts0.28 +8%
Vas309 L +22%, worse
BL36.4 T·m +12%, better
Xmax13 mm −13%, worse
Sensitivity96.5 dB +0.9
CelestionTSQ2145
£445.00Fs30 Hz +3%
Qts0.34 +32%, worse
Vas253.8 L –
BL33.8 T·m +4%
Xmax15 mm –
Sensitivity94.8 dB −0.8
Dayton AudioHTS545HE-4
£453.33Fs26 Hz −9%
Qts0.28 +8%
Vas179 L −30%, better
BL38.2 T·m +17%, better
Xmax21 mm +40%, better
Sensitivity92.5 dB −3.1, worse
RCFLF21N451
£475.00Fs30 Hz +3%
Qts0.26 –
Vas375 L +48%, worse
BL34.5 T·m +6%
Xmax13 mm −13%, worse
Sensitivity97.8 dB +2.2, better
Beyma21LEX1600ND
£475.00Fs30 Hz +3%
Qts0.29 +12%, worse
Vas305 L +20%, worse
BL36.6 T·m +12%, better
Xmax14 mm −7%
Sensitivity96.4 dB +0.8
LavoceSAN214.50
£480.70Fs33 Hz +14%, worse
Qts0.28 +8%
Vas218.3 L −14%, better
BL39.6 T·m +22%, better
Xmax15.4 mm –
Sensitivity96.4 dB +0.8
B&C21DS115
£489.14Fs32 Hz +10%, worse
Qts0.21 −19%, better
Vas219 L −14%, better
BL28.6 T·m −12%, worse
Xmax15 mm –
Sensitivity97.2 dB +1.6
Eighteen Sound21LW1400
£548.61Fs28 Hz −3%
Qts0.24 −8%
Vas385 L +52%, worse
BL33.5 T·m –
Xmax9.5 mm −37%, worse
Sensitivity97.5 dB +1.9
Eighteen Sound21NLW9001
£554.81Fs32 Hz +10%, worse
Qts0.31 +19%, worse
Vas244 L −4%
BL37 T·m +13%, better
Xmax14 mm −7%
Sensitivity95.7 dB –
B&C21SW152
£585.00Fs32 Hz +10%, worse
Qts0.30 +15%, worse
Vas200 L −21%, better
BL32.5 T·m –
Xmax15 mm –
Sensitivity95.3 dB –
Eighteen Sound21NLW9601
£599.21Fs41 Hz +41%, worse
Qts0.32 +23%, worse
Vas123 L −52%, better
BL32.7 T·m –
Xmax14 mm −7%
Sensitivity96.1 dB +0.5
EminenceNSW6021-6
£800.00Fs29 Hz –
Qts0.31 +19%, worse
Vas224.6 L −12%, better
BL33.8 T·m +4%
Xmax21 mm +40%, better
Sensitivity94.5 dB −1.1
No photo
Precision DevicesPD.2160-1N
£811.00Fs35 Hz +21%, worse
Qts0.30 +15%, worse
Vas177 L −30%, better
BL43 T·m +32%, better
Xmax16 mm +7%
Sensitivity95.9 dB –
FaitalPRO21XL3000
£886.20Fs32 Hz +10%, worse
Qts0.22 −15%, better
Vas223.5 L −12%, better
BL35.5 T·m +9%
Xmax17.7 mm +18%, better
Sensitivity97.3 dB +1.7
EminenceNSW6021-124
£925.57Fs31 Hz +6%
Qts0.32 +23%, worse
Vas224.6 L −12%, better
BL30.5 T·m −6%
Xmax21 mm +40%, better
Sensitivity95 dB −0.6
Dayton AudioPSS545HE-4
No current priceFs29 Hz –
Qts0.27 +4%
Vas212.2 L −16%, better
BL35.5 T·m +9%
Xmax21 mm +40%, better
Sensitivity94.6 dB −1
Eighteen Sound21NLW9601C
No current priceFs38 Hz +31%, worse
Qts0.29 +12%, worse
Vas140 L −45%, better
BL33.2 T·m –
Xmax14 mm −7%
Sensitivity96 dB –
Eighteen Sound21LW2600
No current priceFs27 Hz −7%
Qts0.29 +12%, worse
Vas332 L +31%, worse
BL24.9 T·m −24%, worse
Xmax14.6 mm –
Sensitivity95.6 dB –
CelestionTSQ2160
No current priceFs30 Hz +3%
Qts0.26 –
Vas234.8 L −8%
BL43.1 T·m +32%, better
Xmax18.8 mm +25%, better
Sensitivity95.8 dB –
BishopSoundBWN21/4
No current priceFs29 Hz –
Qts0.42 +61%, worse
Vas244.2 L −4%
BL32.6 T·m –
Xmax15 mm –
Sensitivity93.2 dB −2.4, worse
BishopSoundBWN21/8
No current priceFs29 Hz –
Qts0.42 +61%, worse
Vas244.2 L −4%
BL32.6 T·m –
Xmax15 mm –
Sensitivity93.2 dB −2.4, worse
No current price
Fs35 Hz +21%, worse
Qts0.34 +30%, worse
Vas266 L +5%
BL31.3 T·m −4%
Xmax14 mm −7%
Sensitivity97.1 dB +1.5
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +21%, worse
Qts0.34 +30%, worse
Vas266 L +5%
BL31.3 T·m −4%
Xmax14 mm −7%
Sensitivity97.1 dB +1.5
Eighteen Sound21NLW5300
No current priceFs31 Hz +7%
Qts0.32 +23%, worse
Vas325 L +28%, worse
BL31 T·m −5%
Xmax15.3 mm –
Sensitivity96.6 dB +1
Sica21 S 4 PL
No current priceFs35 Hz +19%, worse
Qts0.30 +15%, worse
Vas255 L –
BL36.1 T·m +11%, better
Xmax5.2 mm −65%, worse
Sensitivity97.4 dB +1.8
Eighteen Sound21ID
No current priceFs38 Hz +31%, worse
Qts0.23 −12%, better
Vas143 L −44%, better
BL25.2 T·m −23%, worse
Xmax14 mm −7%
Sensitivity97.2 dB +1.6
No current price
Fs33 Hz +14%, worse
Qts0.36 +38%, worse
Vas241 L −5%
BL30 T·m −8%
Xmax14 mm −7%
Sensitivity95.7 dB –
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz +14%, worse
Qts0.36 +38%, worse
Vas241 L −5%
BL30 T·m −8%
Xmax14 mm −7%
Sensitivity95.7 dB –
Eighteen Sound21LW2500
No current priceFs29 Hz –
Qts0.37 +42%, worse
Vas305 L +20%, worse
BL30 T·m −8%
Xmax14 mm −7%
Sensitivity94.9 dB −0.7
CelestionNTR21-5010JD
No current priceFs32 Hz +11%, worse
Qts0.32 +23%, worse
Vas276.7 L +9%
BL33.9 T·m +4%
Xmax9 mm −40%, worse
Sensitivity96.4 dB +0.8
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
No current price found. Pricing may appear after the next vendor refresh.