B&C8FMB51
£80.08 · 49% less, betterFs67 Hz −12%, better
Qts0.28 +12%, worse
Vas20.7 L +95%, worse
BL11.3 T·m –
Xmax5.5 mm −8%
Sensitivity95.1 dB +0.5
8-inch LF driver · 8NW series · 51 mm voice coil · 200 W
B&C 8NW51 4Ω
70–3000 Hz
No price for delivery to the UK
- Fs
- 76Hz
- Xmax
- 6mm
- SPL
- 95dB
- Pe
- 200W
- BL
- 11.2T·m
- Vd
- 132cm³
- Qts
- 0.25
- Vas
- 11L
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 87c600025dde…Medium confidence5,325 selected pixels of 5,325 - Trace datasheet-response-trace-poc/v2
free-air impedance
Impedance response
240 plotted pointsSource file SHA-256 87c600025dde…Medium confidence3,789 selected pixels of 3,789
Published graphs
B&C 8NW51 is an 8-inch 4 ohm LF driver rated at 200 W RMS. The validated T/S data includes Fs 76 Hz, Qts 0.25, Vas 10.6 L, Xmax 6 mm, sensitivity 94.6 dB, plus 132 cm³ Vd and 292 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 £157.53.
The published T/S values agree with each other
Thiele/Small
- Fs
- 76Hz
- Qts
- 0.25
- Qes
- 0.26
- Qms
- 5.3
- Vas
- 10.6L
- Re
- 2.5Ω
- Le
- 0.20mH
Motor and cone
- BL
- 11.2T·m
- Sd
- 220cm²
- Mms
- 27g
- Xmax
- 6mm
- Vd †
- 132cm³
- Voice coil
- 51mm
- Flux density
- 1.30T
Power and response
- Sensitivity †
- 94.6dB
- Manufacturer sensitivity
- 97dB
- Power
- 200W
- Nominal power
- 200W
- Impedance
- 4Ω
- Min. impedance
- 3.7Ω
- Range
- 70–3000Hz
- EBP †
- 292 · Leans vented
Size and mounting
- Diameter
- 225mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Depth
- 100mm
- Weight
- 3.0kg
Sensitivity shows 94.6 dB, calculated from the T/S values. B&C publishes 97.0 dB, 2.4 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 11.2T·m
- Fs
- 76Hz
- Le
- 0.20mH
- Re
- 2.5Ω
- Sd
- 220cm²
- Mms
- 27g
- Qes
- 0.26
- Qms
- 5.3
- Qts
- 0.25
- SPL
- 94.6dB
- Vas
- 10.6L
- Xmax
- 6mm
- Power
- 200W
- Impedance
- 4Ω
- Flux density
- 1.30T
- Sensitivity
- 97dB
- Low limit
- 70Hz
- Nominal power
- 200W
- Calculated sensitivity †
- 94.6dB
- High limit
- 3000Hz
- Manufacturer sensitivity
- 97dB
- Min. impedance
- 3.7Ω
- Voice coil
- 51mm
- Weight
- 3.0kg
- Diameter
- 225mm
- Depth
- 100mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Bl
- 11.2 Tm
- Fs
- 76 Hz
- Le
- 0.2 mH
- Re
- 2.5 Ω
- Sd
- 220 cm² (34.1 in²)
- Ebp
- 292 Hz
- Mms
- 27 g
- Qes
- 0.26
- Qms
- 5.3
- Qts
- 0.25
- Vas
- 10.6 dm³ (0.37 ft³)
- Η0
- 1.76 %
- Cone
- RCK008NW514
- Xmax
- 6 mm
- Xvar
- 5 mm
- Depth
- 100 mm (4 in)
- Spider
- Single
- Cone shape
- Exponential
- Net weight
- 3.05 kg (6.72 lb)
- Pole design
- T-Pole
- Sensitivity
- 97 dB
- Flux density
- 1.3 T
- Shipping box
- 255x255x150 mm (10.04x10.04x5.91 in)
- Winding depth
- 16 mm (0.65 in)
- Shipping units
- 1 pcs
- Surround shape
- Double Roll
- Former material
- Glass Fibre
- Frequency range
- 70 Hz - 3000 Hz
- Magnet material
- Neodymium Ring
- Shipping weight
- 3.5 kg (7.72 lb)
- Nominal diameter
- 200 mm (8 in)
- Overall diameter
- 225 mm (8.8 in)
- Winding material
- Copper
- Minimum impedance
- 3.7 Ω
- Nominal impedance
- 4 Ω
- Magnetic gap depth
- 10 mm (0.4 in)
- Voice coil diameter
- 51 mm (2 in)
- Bolt circle diameter
- 210 mm (8.3 in)
- Woofer cone treatment
- TWP Waterproof Both Sides
- Baffle cutout diameter
- 187 mm (7.4 in)
- Nominal power handling
- 200 W
- Continuous power handling
- 400 W
- Flange and gasket thickness
- 11 mm (0.4 in)
- Air volume occupied by driver
- 1.1 dm³ (0.04 ft³)
02
Compare
Same-size drivers, compared with the 8NW51. Clear differences are green when better and red when worse.
This driver8NW51
Best price
£157.53
Fs
76 Hz
Qts
0.25
Vas
10.6 L
BL
11.2 T·m
Xmax
6 mm
Sensitivity
94.6 dB
Power
200 W
Beyma8WR300
£91.09 · 42% less, betterFs65 Hz −14%, better
Qts0.27 +8%
Vas15 L +42%, worse
BL15.5 T·m +38%, better
Xmax6 mm –
Sensitivity93.6 dB −1
B&C8MBX51
£113.58 · 28% less, betterFs60 Hz −21%, better
Qts0.29 +16%, worse
Vas23 L +117%, worse
BL11.4 T·m –
Xmax6 mm –
Sensitivity94.1 dB −0.5
B&C8NDL64
£121.96 · 23% less, betterFs80 Hz +5%
Qts0.25 –
Vas9.6 L −9%
BL17.5 T·m +56%, better
Xmax4.5 mm −25%, worse
Sensitivity95 dB –
CelestionNTR08-2011D
£125.00 · 21% less, betterFs85 Hz +12%, worse
Qts0.44 +74%, worse
Vas10.3 L –
BL12.0 T·m +7%
Xmax6 mm –
Sensitivity92.7 dB −1.9
£133.54 · 15% less, better
Fs20 Hz −74%, better
Qts0.24 −4%
Vas108 L +919%, worse
BL11.4 T·m –
Xmax7 mm +17%, better
Sensitivity87.2 dB −7.4, worse
Eighteen Sound8NW650
£138.53 · 12% less, betterFs62 Hz −18%, better
Qts0.25 –
Vas19.0 L +79%, worse
BL19.1 T·m +71%, better
Xmax5.5 mm −8%
Sensitivity94.4 dB –
Eighteen Sound8NTLW2000
£138.90 · 12% less, betterFs74 Hz –
Qts0.26 +4%
Vas11.3 L +7%
BL22.4 T·m +100%, better
Xmax4.4 mm −27%, worse
Sensitivity94.3 dB –
LavoceWAN082.02
£148.73 · 6% less, betterFs80 Hz +5%
Qts0.23 −8%
Vas9.0 L −15%, better
BL17.8 T·m +59%, better
Xmax5.8 mm −3%
Sensitivity94.7 dB –
RCFMB8N251
£150.76 · 4% lessFs68 Hz −11%, better
Qts0.25 –
Vas13 L +23%, worse
BL15.2 T·m +36%, better
Xmax5 mm −17%, worse
Sensitivity94 dB −0.6
Sica8 K 3 PL
£160.07 · 2% moreFs68 Hz −10%, better
Qts0.25 –
Vas12.2 L +15%, worse
BL16.1 T·m +44%, better
Xmax5 mm −17%, worse
Sensitivity93.6 dB −1
Eighteen Sound8NTLS2000
£187.77 · 19% more, worseFs43 Hz −43%, better
Qts0.24 −4%
Vas30 L +183%, worse
BL11.1 T·m –
Xmax7.4 mm +23%, better
Sensitivity92 dB −2.6, worse
Eighteen Sound8NMB750
£216.82 · 38% more, worseFs88 Hz +16%, worse
Qts0.27 +8%
Vas6.9 L −35%, better
BL18.7 T·m +67%, better
Xmax6.1 mm –
Sensitivity94.3 dB –
B&C8CXN51
£225.53 · 43% more, worseFs68 Hz −11%, better
Qts0.27 +8%
Vas17 L +60%, worse
BL12.6 T·m +13%, better
Xmax6 mm –
Sensitivity94.7 dB –
Beyma8CX300ND
£321.98 · 104% more, worseFs61 Hz −20%, better
Qts0.29 +16%, worse
Vas23 L +117%, worse
BL12 T·m +7%
Xmax6 mm –
Sensitivity94.4 dB –
AccutonC173-6-096
£846.91 · 438% more, worseFs50 Hz −34%, better
Qts0.22 −12%, better
Vas17.0 L +60%, worse
BL11.4 T·m –
Xmax5 mm −17%, worse
Sensitivity91.5 dB −3.1, worse
AccutonS220-6-222
£912.25 · 479% more, worseFs25 Hz −67%, better
Qts0.26 +4%
Vas89.7 L +746%, worse
BL10.9 T·m –
Xmax5.3 mm −13%, worse
Sensitivity89.2 dB −5.4, worse
AccutonC220-6-222
£1,016.30 · 545% more, worseFs30 Hz −61%, better
Qts0.26 +4%
Vas74 L +598%, worse
BL11.7 T·m +4%
Xmax6 mm –
Sensitivity90.5 dB −4.1, worse
Oberton8NB201
No current priceFs71 Hz −7%
Qts0.24 –
Vas12.5 L +18%, worse
BL14.4 T·m +29%, better
Xmax5.3 mm −13%, worse
Sensitivity94.4 dB –
Oberton8NMB250V4
No current priceFs82 Hz +8%
Qts0.26 +3%
Vas10.9 L –
BL14.3 T·m +27%, better
Xmax4.5 mm −25%, worse
Sensitivity95.5 dB +0.9
B&C8CLA64
No current priceFs71 Hz −7%
Qts0.24 −4%
Vas12.5 L +18%, worse
BL16.4 T·m +46%, better
Xmax5.3 mm −12%, worse
Sensitivity94.6 dB –
No photo
PHL Audio2730
No current priceFs42 Hz −45%, better
Qts0.26 +4%
Vas34.1 L +222%, worse
BL12.6 T·m +13%, better
Xmax7 mm +17%, better
Sensitivity91.7 dB −2.9, worse
KartesianLOM185_VKI
No current priceFs40 Hz −47%, better
Qts0.25 –
Vas29 L +174%, worse
BL10.4 T·m −7%
Xmax8 mm +33%, better
Sensitivity90.6 dB −4, worse
LavoceWAF082.01
No current priceFs76 Hz –
Qts0.21 −16%, better
Vas10.2 L −4%
BL17.9 T·m +60%, better
Xmax5.8 mm −3%
Sensitivity95.1 dB +0.5
WavecorWF182BD14
No current priceFs36 Hz −53%, better
Qts0.25 –
Vas23 L +117%, worse
BL6.9 T·m −38%, worse
Xmax5.5 mm −8%
Sensitivity88.2 dB −6.4, worse
WavecorWF182BD04
No current priceFs34 Hz −56%, better
Qts0.25 –
Vas32.4 L +206%, worse
BL6.8 T·m −40%, worse
Xmax5.5 mm −8%
Sensitivity88.9 dB −5.7, worse
LavoceCAN082.00K
No current priceFs72 Hz −5%
Qts0.27 +8%
Vas15.1 L +42%, worse
BL13.2 T·m +17%, better
Xmax6.7 mm +12%, better
Sensitivity94.8 dB –
CelestionNTR08-2009D
No current priceFs71 Hz −6%
Qts0.21 −16%, better
Vas11.7 L +10%
BL18.0 T·m +61%, better
Xmax6.5 mm +8%
Sensitivity94.6 dB –
HiViSS8IIN
No current priceFs29 Hz −62%, better
Qts0.27 +8%
Vas80.1 L +656%, worse
BL10.6 T·m −5%
Xmax5 mm −17%, worse
Sensitivity90.3 dB −4.3, worse
CelestionCNX0820
No current priceFs95 Hz +24%, worse
Qts0.40 +58%, worse
Vas9.9 L −7%
BL12.0 T·m +7%
Xmax6 mm –
Sensitivity94.7 dB –
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
None of the shops we track lists delivery to the UK at checkout.