B&C gives the tuning only; the port is yours to size.
12-inch LF driver · 12SW series · 115 mm voice coil · 1,700 W
B&C 12SW115 8Ω
40–1500 Hz
- Fs
- 38Hz
- Xmax
- 13.5mm
- SPL
- 91dB
- Pe
- 1700W
- BL
- 30.3T·m
- Vd
- 705cm³
- Qts
- 0.25
- Vas
- 34L
Published graphs
B&C 12SW115 is a 12-inch 8 ohm LF driver rated at 1700 W RMS. The validated T/S data includes Fs 38 Hz, Qts 0.25, Vas 34 L, Xmax 13.5 mm, sensitivity 90.6 dB, plus 705 cm³ Vd and 146 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 £369.80.
The published T/S values agree with each other
Thiele/Small
- Fs
- 38Hz
- Qts
- 0.25
- Qes
- 0.26
- Qms
- 9.3
- Vas
- 34L
- Re
- 5.1Ω
- Le
- 1.90mH
Motor and cone
- BL
- 30.3T·m
- Sd
- 522cm²
- Mms
- 198g
- Xmax
- 13.5mm
- Vd †
- 705cm³
- Voice coil
- 115mm
- Flux density
- 1.12T
Power and response
- Sensitivity †
- 90.6dB
- Manufacturer sensitivity
- 92.5dB
- Power
- 1700W
- Nominal power
- 1700W
- Impedance
- 8Ω
- Min. impedance
- 6.5Ω
- Range
- 40–1500Hz
- EBP †
- 146 · Leans vented
Size and mounting
- Diameter
- 315mm
- Cutout
- 283mm
- Bolt circle
- 298mm
- Depth
- 167mm
- Weight
- 10.4kg
Sensitivity shows 90.6 dB, calculated from the T/S values. B&C publishes 92.5 dB, 1.9 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 30.3T·m
- Fs
- 38Hz
- Le
- 1.90mH
- Re
- 5.1Ω
- Sd
- 522cm²
- Mms
- 198g
- Qes
- 0.26
- Qms
- 9.3
- Qts
- 0.25
- SPL
- 90.6dB
- Vas
- 34L
- Xmax
- 13.5mm
- Power
- 1700W
- Impedance
- 8Ω
- Flux density
- 1.12T
- Sensitivity
- 92.5dB
- Low limit
- 40Hz
- Nominal power
- 1700W
- Calculated sensitivity †
- 90.6dB
- High limit
- 1500Hz
- Manufacturer sensitivity
- 92.5dB
- Min. impedance
- 6.5Ω
- Voice coil
- 115mm
- Weight
- 10.4kg
- Diameter
- 315mm
- Depth
- 167mm
- Cutout
- 283mm
- Bolt circle
- 298mm
- Bl
- 30.3 Tm
- Fs
- 38 Hz
- Le
- 1.9 mH
- Re
- 5.1 Ω
- Sd
- 522 cm² (80.91 in²)
- Ebp
- 146 Hz
- Mms
- 198 g
- Qes
- 0.26
- Qms
- 9.3
- Qts
- 0.25
- Vas
- 34 dm³ (1.2 ft³)
- Η0
- 0.7 %
- Xmax
- 13.5 mm
- Xvar
- 10.9 mm
- Depth
- 167 mm (6.6 in)
- Spider
- Double Silicone
- Cone shape
- Radial
- Net weight
- 10.4 kg (22.93 lb)
- Pole design
- T-Pole
- Sensitivity
- 92.5 dB
- Flux density
- 1.12 T
- Winding depth
- 34 mm (1.35 in)
- Shipping units
- 1 pcs
- Surround shape
- Triple Roll
- Former material
- Glass Fibre
- Frequency range
- 40 Hz - 1500 Hz
- Magnet material
- Neodymium Inside Slug
- Nominal diameter
- 320 mm (12 in)
- Overall diameter
- 315 mm (12.4 in)
- Winding material
- Copper
- Minimum impedance
- 6.5 Ω
- Nominal impedance
- 8 Ω
- Magnetic gap depth
- 14 mm (0.55 in)
- Recommended loading
- Vented Box
- Voice coil diameter
- 115 mm (4.5 in)
- Bolt circle diameter
- 298 mm (11.73 in)
- Woofer cone treatment
- TWP Waterproof Both Sides
- Baffle cutout diameter
- 283 mm (11.1 in)
- Nominal power handling
- 1700 W
- Continuous power handling
- 3400 W
- Flange and gasket thickness
- 12 mm (0.5 in)
- Air volume occupied by driver
- 3.4 dm³ (0.12 ft³)
B&C’s suggested box
From B&C’s 12SW115 page
Open the 12SW115 in 00 Simulator
03
Compare
Same-size drivers, compared with the 12SW115. Clear differences are green when better and red when worse.
This driver12SW115
Best price
£369.80
Fs
38 Hz
Qts
0.25
Vas
34 L
BL
30.3 T·m
Xmax
13.5 mm
Sensitivity
90.6 dB
Power
1700 W
B&C12CLA76
£153.30 · 59% less, betterFs52 Hz +37%, worse
Qts0.25 –
Vas56 L +65%, worse
BL20.2 T·m −33%, worse
Xmax5.3 mm −61%, worse
Sensitivity96.8 dB +6.2, better
FaitalPRO12FH500
£180.28 · 51% less, betterFs45 Hz +18%, worse
Qts0.25 –
Vas87.3 L +157%, worse
BL17.5 T·m −42%, worse
Xmax7.5 mm −44%, worse
Sensitivity96.9 dB +6.3, better
RCFMB12X351
£187.93 · 49% less, betterFs55 Hz +45%, worse
Qts0.26 +4%
Vas46 L +35%, worse
BL22.5 T·m −26%, worse
Xmax7 mm −48%, worse
Sensitivity96.6 dB +6, better
PRV Audio12MR2000X
£189.23 · 49% less, betterFs65 Hz +70%, worse
Qts0.28 +12%, worse
Vas39.6 L +16%, worse
BL23.2 T·m −23%, worse
Xmax6.6 mm −51%, worse
Sensitivity97.9 dB +7.3, better
B&C12PS100
£189.73 · 49% less, betterFs44 Hz +16%, worse
Qts0.27 +8%
Vas47 L +38%, worse
BL22.5 T·m −26%, worse
Xmax8 mm −41%, worse
Sensitivity93.4 dB +2.8, better
B&C12TBX100
£201.58 · 45% less, betterFs42 Hz +11%, worse
Qts0.26 +4%
Vas37.5 L +10%, worse
BL25.5 T·m −16%, worse
Xmax9 mm −33%, worse
Sensitivity92.2 dB +1.6
Beyma12LEX1000FE
£203.18 · 45% less, betterFs49 Hz +29%, worse
Qts0.30 +20%, worse
Vas38.4 L +13%, worse
BL24.6 T·m −19%, worse
Xmax11 mm −19%, worse
Sensitivity93.5 dB +2.9, better
BMS12S330
£204.98 · 45% less, betterFs29 Hz −25%, better
Qts0.24 −4%
Vas85.5 L +151%, worse
BL23 T·m −24%, worse
Xmax8 mm −41%, worse
Sensitivity91.1 dB +0.5
BMS12S305
£213.05 · 42% less, betterFs35 Hz −8%
Qts0.27 +6%
Vas82 L +141%, worse
BL20.1 T·m −34%, worse
Xmax11 mm −19%, worse
Sensitivity93 dB +2.4, better
Beyma12MC700ND
£217.96 · 41% less, betterFs51 Hz +34%, worse
Qts0.24 −4%
Vas58 L +71%, worse
BL21.6 T·m −29%, worse
Xmax7 mm −48%, worse
Sensitivity96.7 dB +6.1, better
FaitalPRO12HP1020
£235.45 · 36% less, betterFs55 Hz +45%, worse
Qts0.27 +8%
Vas38.6 L +14%, worse
BL24.3 T·m −20%, worse
Xmax9 mm −33%, worse
Sensitivity95.6 dB +5, better
B&C12NBX100
£244.77 · 34% less, betterFs41 Hz +8%
Qts0.22 −12%, better
Vas51 L +50%, worse
BL25.6 T·m −16%, worse
Xmax10 mm −26%, worse
Sensitivity93.7 dB +3.1, better
FaitalPRO12FX600
£247.20 · 33% less, betterFs48 Hz +26%, worse
Qts0.24 −4%
Vas44.4 L +31%, worse
BL25.3 T·m −17%, worse
Xmax9.9 mm −27%, worse
Sensitivity95 dB +4.4, better
BMS12N620
£247.26 · 33% less, betterFs45 Hz +18%, worse
Qts0.25 –
Vas72.7 L +114%, worse
BL20.6 T·m −32%, worse
Xmax5.5 mm −59%, worse
Sensitivity96 dB +5.4, better
FaitalPRO12HP1030
£249.85 · 32% less, betterFs45 Hz +18%, worse
Qts0.30 +20%, worse
Vas35.9 L +6%
BL24.3 T·m −20%, worse
Xmax12.4 mm −8%
Sensitivity92.3 dB +1.7
B&C12NW100
£252.39 · 32% less, betterFs42 Hz +11%, worse
Qts0.20 −20%, better
Vas44 L +29%, worse
BL28 T·m −8%
Xmax9 mm −33%, worse
Sensitivity93.9 dB +3.3, better
FaitalPRO12RS1066
£253.24 · 32% less, betterFs42 Hz +11%, worse
Qts0.33 +32%, worse
Vas31.5 L −7%
BL24.8 T·m −18%, worse
Xmax12.4 mm −8%
Sensitivity90.4 dB –
FaitalPRO12HP1060
£260.09 · 30% less, betterFs45 Hz +18%, worse
Qts0.28 +12%, worse
Vas36.9 L +9%
BL24.8 T·m −18%, worse
Xmax12.4 mm −8%
Sensitivity92.7 dB +2.1, better
BMS12N802
£271.01 · 27% less, betterFs43 Hz +13%, worse
Qts0.24 −4%
Vas65 L +91%, worse
BL22.3 T·m −27%, worse
Xmax4.5 mm −67%, worse
Sensitivity95.2 dB +4.6, better
Beyma12P1000ND
£305.27 · 17% less, betterFs47 Hz +24%, worse
Qts0.26 +4%
Vas49 L +44%, worse
BL23.5 T·m −22%, worse
Xmax8 mm −41%, worse
Sensitivity94.8 dB +4.2, better
Eighteen Sound12NLW9410
£335.39 · 9% less, betterFs42 Hz +11%, worse
Qts0.26 +4%
Vas55 L +62%, worse
BL21.7 T·m −28%, worse
Xmax11 mm −19%, worse
Sensitivity93.8 dB +3.2, better
Beyma12CXA400FE
£337.46 · 9% less, betterFs42 Hz +11%, worse
Qts0.25 –
Vas94 L +176%, worse
BL19.8 T·m −35%, worse
Xmax6 mm −56%, worse
Sensitivity96.3 dB +5.7, better
Sica12 S 4 PL
£337.94 · 9% less, betterFs40 Hz +6%
Qts0.25 –
Vas57 L +68%, worse
BL23.5 T·m −22%, worse
Xmax7.5 mm −44%, worse
Sensitivity93.6 dB +3, better
Beyma12CXA400ND
£349.99 · 5% less, betterFs45 Hz +18%, worse
Qts0.25 –
Vas88.5 L +160%, worse
BL21.4 T·m −29%, worse
Xmax6 mm −56%, worse
Sensitivity96.9 dB +6.3, better
Beyma12LEX1300ND
£360.37 · 3% lessFs45 Hz +18%, worse
Qts0.24 −4%
Vas43 L +26%, worse
BL26.4 T·m −13%, worse
Xmax11 mm −19%, worse
Sensitivity94 dB +3.4, better
Sica12 K 4 PL
No current priceFs49 Hz +28%, worse
Qts0.25 –
Vas47.4 L +39%, worse
BL22.9 T·m −25%, worse
Xmax7 mm −48%, worse
Sensitivity95 dB +4.4, better
Acoustic EleganceTD12H-8
No current priceFs27 Hz −30%, better
Qts0.23 −8%
Vas160 L +371%, worse
BL19.7 T·m −35%, worse
Xmax14 mm +4%
Sensitivity92.9 dB +2.3, better
Acoustic EleganceTD12H-4
No current priceFs27 Hz −30%, better
Qts0.23 −8%
Vas160 L +371%, worse
BL14.4 T·m −52%, worse
Xmax14 mm +4%
Sensitivity92.9 dB +2.3, better
Sica12 PFS 4
No current priceFs39 Hz –
Qts0.26 +4%
Vas55.6 L +64%, worse
BL23.9 T·m −21%, worse
Xmax9 mm −33%, worse
Sensitivity92.9 dB +2.3, better
Audio Technology12 D 77 25 10 KAP
No current priceFs19 Hz −50%, better
Qts0.25 –
Vas340 L +900%, worse
BL14 T·m −54%, worse
Xmax8.6 mm −36%, worse
Sensitivity91.6 dB +1
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Thomann4.0 out of 51 rating · Checked 9 Oct 2026Read reviews on Thomann
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
JP Leisure | £369.80, the lowest price | In stock | Visit shop at JP Leisure | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £369.80 | In stock | Visit shop at JP Leisure | |
Thomann | £384.00 | 3.8% above the lowest price | In stock | Visit shop at Thomann |
Blue Aran 5-7 weeks | £414.55 | 12% above the lowest price | 17 in stock | Visit shop at Blue Aran |
Audio Video Parts Import VAT and duty may apply | £309.12 | Special order | Visit shop at Audio Video Parts |
Best price over time
Tracked since 1 Apr
Recent changes
- 4 OctThomann£389.00 → £384.00Down 1.3% from £389.00
- 26 SepThomann£387.00 → £389.00Up 0.5% from £387.00
- 18 SepThomann£388.00 → £387.00Down 0.3% from £388.00