- Net volume
- 40L
- Tuning
- 50Hz
B&C gives the volume and tuning; the port is sized for the driver when you open it.
12-inch LF driver · 12NBX series · 100 mm voice coil · 1,000 W
B&C 12NBX100 8Ω
40–1500 Hz
- Fs
- 41Hz
- Xmax
- 10mm
- SPL
- 94dB
- Pe
- 1000W
- BL
- 25.6T·m
- Vd
- 531cm³
- Qts
- 0.22
- Vas
- 51L
Manufacturer response and impedance data, with source and trace details below. The left and right arrow keys read every shown curve at a frequency, a twelfth of an octave at a time, or an octave with Shift. Escape clears the reading.
Curve provenanceInspect 2 traces
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v2
free-air SPL
Frequency response
240 plotted pointsSource file SHA-256 fe90ee1b80db…Medium confidence7,804 selected pixels of 9,592 - Trace datasheet-response-trace-poc/v2
free-air impedance
Impedance response
240 plotted pointsSource file SHA-256 fe90ee1b80db…Medium confidence5,207 selected pixels of 5,901
Published graphs
B&C 12NBX100 is a 12-inch 8 ohm LF driver rated at 1000 W RMS. The validated T/S data includes Fs 41 Hz, Qts 0.22, Vas 51 L, Xmax 10 mm, sensitivity 93.7 dB, plus 531 cm³ Vd and 171 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 £246.00.
The published T/S values agree with each other
Thiele/Small
- Fs
- 41Hz
- Qts
- 0.22
- Qes
- 0.24
- Qms
- 3.9
- Vas
- 51L
- Re
- 5.1Ω
- Le
- 1.90mH
Motor and cone
- BL
- 25.6T·m
- Sd
- 531cm²
- Mms
- 117g
- Xmax
- 10mm
- Vd †
- 531cm³
- Voice coil
- 100mm
- Flux density
- 1.10T
Power and response
- Sensitivity †
- 93.7dB
- Manufacturer sensitivity
- 96dB
- Power
- 1000W
- Nominal power
- 1000W
- Impedance
- 8Ω
- Min. impedance
- 6.5Ω
- Range
- 40–1500Hz
- EBP †
- 171 · Leans vented
Size and mounting
- Diameter
- 320mm
- Cutout
- 280mm
- Bolt circle
- 300mm
- Depth
- 143mm
- Weight
- 8.3kg
Sensitivity shows 93.7 dB, calculated from the T/S values. B&C publishes 96.0 dB, 2.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 25.6T·m
- Fs
- 41Hz
- Le
- 1.90mH
- Re
- 5.1Ω
- Sd
- 531cm²
- Mms
- 117g
- Qes
- 0.24
- Qms
- 3.9
- Qts
- 0.22
- SPL
- 93.7dB
- Vas
- 51L
- Xmax
- 10mm
- Power
- 1000W
- Impedance
- 8Ω
- Flux density
- 1.10T
- Sensitivity
- 96dB
- Low limit
- 40Hz
- Nominal power
- 1000W
- Calculated sensitivity †
- 93.7dB
- High limit
- 1500Hz
- Manufacturer sensitivity
- 96dB
- Min. impedance
- 6.5Ω
- Voice coil
- 100mm
- Weight
- 8.3kg
- Diameter
- 320mm
- Depth
- 143mm
- Cutout
- 280mm
- Bolt circle
- 300mm
- Bl
- 25.6 Tm
- Fs
- 41 Hz
- Le
- 1.9 mH
- Re
- 5.1 Ω
- Sd
- 531 cm² (82 in²)
- Ebp
- 171 Hz
- Mms
- 117 g
- Qes
- 0.24
- Qms
- 3.9
- Qts
- 0.22
- Vas
- 51 dm³ (1.8 ft³)
- Η0
- 1.45 %
- Cone
- RCK12NBX1008
- Xmax
- 10 mm
- Xvar
- 10 mm
- Depth
- 143 mm (5.63 in)
- Spider
- Double Silicone
- Cone shape
- Exponential
- Net weight
- 8.25 kg (18.19 lb)
- Pole design
- T-Pole
- Sensitivity
- 96 dB
- Flux density
- 1.1 T
- Shipping box
- 360x360x200 mm (14.17x14.17x7.87 in)
- Winding depth
- 25 mm (1 in)
- Shipping units
- 1 pcs
- Surround shape
- Triple Roll
- Former material
- Glass Fibre
- Frequency range
- 40 Hz - 1500 Hz
- Magnet material
- Neodymium Inside Slug
- Shipping weight
- 9.15 kg (20.17 lb)
- Nominal diameter
- 320 mm (12 in)
- Overall diameter
- 320 mm (12.6 in)
- Winding material
- Copper
- Minimum impedance
- 6.5 Ω
- Nominal impedance
- 8 Ω
- Magnetic gap depth
- 11 mm (0.43 in)
- Recommended tuning
- 50 Hz
- Voice coil diameter
- 100 mm (4 in)
- Bolt circle diameter
- 300 mm (11.8 in)
- Recommended enclosure
- 40 dm³ (1.41 ft³)
- Woofer cone treatment
- TWP Waterproof Both Sides
- Baffle cutout diameter
- 280 mm (11 in)
- Nominal power handling
- 1000 W
- Continuous power handling
- 2000 W
- Flange and gasket thickness
- 12 mm (0.47 in)
- Air volume occupied by driver
- 4 dm³ (0.14 ft³)
B&C’s suggested box
From B&C’s 12NBX100 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 12NBX100. Clear differences are green when better and red when worse.
This driver12NBX100
Best price
£246.00
Fs
41 Hz
Qts
0.22
Vas
51 L
BL
25.6 T·m
Xmax
10 mm
Sensitivity
93.7 dB
Power
1000 W
B&C12CL76
£126.59 · 49% less, betterFs48 Hz +17%, worse
Qts0.21 −5%
Vas59 L +16%, worse
BL22.4 T·m −13%, worse
Xmax6 mm −40%, worse
Sensitivity96.8 dB +3.1, better
Beyma12MI100
£154.28 · 37% less, betterFs58 Hz +41%, worse
Qts0.22 –
Vas64 L +25%, worse
BL21.6 T·m −16%, worse
Xmax3 mm −70%, worse
Sensitivity99.4 dB +5.7, better
Precision DevicesPD.121/2
£169.00 · 31% less, betterFs53 Hz +30%, worse
Qts0.23 +5%
Vas66.6 L +31%, worse
BL21.5 T·m −16%, worse
Xmax2.7 mm −73%, worse
Sensitivity98.4 dB +4.7, better
Beyma12P80FE
£175.00 · 29% less, betterFs48 Hz +17%, worse
Qts0.21 −5%
Vas61 L +20%, worse
BL23 T·m −10%, worse
Xmax7.5 mm −25%, worse
Sensitivity96.9 dB +3.2, better
Dayton Audio12LF400-8
£195.19 · 21% less, betterFs28 Hz −32%, better
Qts0.21 −5%
Vas147.8 L +190%, worse
BL21.8 T·m −15%, worse
Xmax9.3 mm −8%
Sensitivity93.7 dB –
B&C12TBX100
£202.02 · 18% less, betterFs42 Hz –
Qts0.26 +18%, worse
Vas37.5 L −26%, better
BL25.5 T·m –
Xmax9 mm −10%, worse
Sensitivity92.2 dB −1.5
Beyma12MC700ND
£217.96 · 11% less, betterFs51 Hz +24%, worse
Qts0.24 +9%
Vas58 L +14%, worse
BL21.6 T·m −16%, worse
Xmax7 mm −30%, worse
Sensitivity96.7 dB +3, better
RCFMB12N351
£225.00 · 9% less, betterFs55 Hz +34%, worse
Qts0.20 −9%
Vas61 L +20%, worse
BL22.5 T·m −12%, worse
Xmax6 mm −40%, worse
Sensitivity98.9 dB +5.2, better
BMS12C262
£228.36 · 7% less, betterFs47 Hz +15%, worse
Qts0.24 +9%
Vas60.6 L +19%, worse
BL20.6 T·m −20%, worse
Xmax2.5 mm −75%, worse
Sensitivity96.1 dB +2.4, better
FaitalPRO12HP1020
£235.97 · 4% lessFs55 Hz +34%, worse
Qts0.27 +23%, worse
Vas38.6 L −24%, better
BL24.3 T·m −5%
Xmax9 mm −10%, worse
Sensitivity95.6 dB +1.9
FaitalPRO12FX600
£247.20 · Same priceFs48 Hz +17%, worse
Qts0.24 +9%
Vas44.4 L −13%, better
BL25.3 T·m –
Xmax9.9 mm –
Sensitivity95 dB +1.3
B&C12NW100
£252.95 · 3% moreFs42 Hz –
Qts0.20 −9%
Vas44 L −14%, better
BL28 T·m +9%
Xmax9 mm −10%, worse
Sensitivity93.9 dB –
BMS12N802
£271.01 · 10% more, worseFs43 Hz +5%
Qts0.24 +9%
Vas65 L +27%, worse
BL22.3 T·m −13%, worse
Xmax4.5 mm −55%, worse
Sensitivity95.2 dB +1.5
BMS12C362
£287.08 · 17% more, worseFs46 Hz +12%, worse
Qts0.20 −9%
Vas60.6 L +19%, worse
BL23.2 T·m −9%
Xmax4.5 mm −55%, worse
Sensitivity96.7 dB +3, better
Beyma12P1000ND
£305.27 · 24% more, worseFs47 Hz +15%, worse
Qts0.26 +18%, worse
Vas49 L −4%
BL23.5 T·m −8%
Xmax8 mm −20%, worse
Sensitivity94.8 dB +1.1
Eighteen Sound12NLW9410
£336.13 · 37% more, worseFs42 Hz –
Qts0.26 +18%, worse
Vas55 L +8%
BL21.7 T·m −15%, worse
Xmax11 mm +10%, better
Sensitivity93.8 dB –
Beyma12LEX1300ND
£360.37 · 46% more, worseFs45 Hz +10%
Qts0.24 +9%
Vas43 L −16%, better
BL26.4 T·m +3%
Xmax11 mm +10%, better
Sensitivity94 dB –
Sica12 S 4 PL
£407.39 · 66% more, worseFs40 Hz –
Qts0.25 +14%, worse
Vas57 L +12%, worse
BL23.5 T·m −8%
Xmax7.5 mm −25%, worse
Sensitivity93.6 dB –
B&C12CXN88
£465.46 · 89% more, worseFs50 Hz +22%, worse
Qts0.22 –
Vas59 L +16%, worse
BL20.9 T·m −18%, worse
Xmax10.5 mm +5%
Sensitivity97.1 dB +3.4, better
Sica12 PFS 4
No current priceFs39 Hz −5%
Qts0.26 +18%, worse
Vas55.6 L +9%
BL23.9 T·m −7%
Xmax9 mm −10%, worse
Sensitivity92.9 dB −0.8
Sica12 F 4 CP
No current priceFs46 Hz +12%, worse
Qts0.20 −9%
Vas52 L –
BL26.0 T·m –
Xmax6 mm −40%, worse
Sensitivity95.8 dB +2.1, better
RCFCX12N351
No current priceFs58 Hz +41%, worse
Qts0.20 −9%
Vas47 L −8%
BL25 T·m –
Xmax6 mm −40%, worse
Sensitivity98.4 dB +4.7, better
No photo
PHL Audio4310NDU
No current priceFs43 Hz +5%
Qts0.27 +23%, worse
Vas56.7 L +11%, worse
BL22 T·m −14%, worse
Xmax10 mm –
Sensitivity94.1 dB –
Precision DevicesPD.124NR1-LR
No current priceFs45 Hz +10%
Qts0.23 –
Vas78 L +53%, worse
BL22 T·m −14%, worse
Xmax8.5 mm −15%, worse
Sensitivity96.9 dB +3.2, better
RCFMB12N405
No current priceFs52 Hz +27%, worse
Qts0.20 −9%
Vas53 L +4%
BL23.5 T·m −8%
Xmax7 mm −30%, worse
Sensitivity97.5 dB +3.8, better
RCFLF12P903
No current priceFs47 Hz +15%, worse
Qts0.23 +5%
Vas65 L +27%, worse
BL22.1 T·m −14%, worse
Xmax7 mm −30%, worse
Sensitivity96.5 dB +2.8, better
No photo
PHL Audio4330NDU
No current priceFs36 Hz −12%, better
Qts0.22 –
Vas82.6 L +62%, worse
BL22 T·m −14%, worse
Xmax8 mm −20%, worse
Sensitivity94.3 dB +0.6
Sica12 K 4 PL
No current priceFs49 Hz +18%, worse
Qts0.25 +14%, worse
Vas47.4 L −7%
BL22.9 T·m −11%, worse
Xmax7 mm −30%, worse
Sensitivity95 dB +1.3
No photo
PHL Audio4071-1
No current priceFs47 Hz +15%, worse
Qts0.24 +9%
Vas57.8 L +13%, worse
BL20.6 T·m −20%, worse
Xmax6.5 mm −35%, worse
Sensitivity95.7 dB +2, better
Sica12 PNS 4
No current priceFs42 Hz –
Qts0.31 +41%, worse
Vas50.2 L –
BL22.3 T·m −13%, worse
Xmax9.5 mm −5%
Sensitivity92.6 dB −1.1
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Thomann5.0 out of 53 ratings · Checked 7 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 |
|---|---|---|---|---|
Thomann | £246.00, the lowest price | In stock | Visit shop at Thomann | |
Blue Aran | £247.00 | 0.4% above the lowest price | 2 in stock | Visit shop at Blue Aran |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £252.08 | 2.5% above the lowest price | In stock | Visit shop at JP Leisure |
JP Leisure | £252.08 | 2.5% above the lowest price | In stock | Visit shop at JP Leisure |
Audio Video Parts Import VAT and duty may apply | £218.91 | Special order | Visit shop at Audio Video Parts | |
Parts Express Import VAT and duty may apply | £319.89 | 30% above the lowest price | 4 in stock | Visit shop at Parts Express |
Best price over time
Tracked since 1 Apr
Recent changes
- 4 OctThomann£249.00 → £246.00Down 1.2% from £249.00
- 26 SepThomann£248.00 → £249.00Up 0.4% from £248.00
- 18 SepThomann£249.00 → £248.00Down 0.4% from £249.00