- Net volume
- 19L
- Tuning
- 63Hz
B&C gives the volume and tuning; the port is sized for the driver when you open it.
8-inch LF driver · 8MBX series · 51 mm voice coil · 200 W
B&C 8MBX51 8Ω
60–4000 Hz
£113.58
SteadyBlue Aran · 8 in stock · All 6 offers
- Fs
- 60Hz
- Xmax
- 6mm
- SPL
- 94dB
- Pe
- 200W
- BL
- 11.4T·m
- Vd
- 132cm³
- Qts
- 0.29
- Vas
- 23L
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 5d73fea3dbc9…Medium confidence4,348 selected pixels of 4,397 - Trace datasheet-response-trace-poc/v2
free-air impedance
Impedance response
240 plotted pointsSource file SHA-256 5d73fea3dbc9…Medium confidence3,760 selected pixels of 3,760
Published graphs
B&C 8MBX51 is an 8-inch 8 ohm LF driver rated at 200 W RMS. The validated T/S data includes Fs 60 Hz, Qts 0.29, Vas 23 L, Xmax 6 mm, sensitivity 94.1 dB, plus 132 cm³ Vd and 194 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 £113.58.
The published T/S values agree with each other
Thiele/Small
- Fs
- 60Hz
- Qts
- 0.29
- Qes
- 0.31
- Qms
- 5.6
- Vas
- 23L
- Re
- 4.9Ω
- Le
- 0.40mH
Motor and cone
- BL
- 11.4T·m
- Sd
- 220cm²
- Mms
- 20g
- Xmax
- 6mm
- Vd †
- 132cm³
- Voice coil
- 51mm
- Flux density
- 1.30T
Power and response
- Sensitivity †
- 94.1dB
- Manufacturer sensitivity
- 96.5dB
- Power
- 200W
- Nominal power
- 200W
- Impedance
- 8Ω
- Min. impedance
- 5.9Ω
- Range
- 60–4000Hz
- EBP †
- 194 · Leans vented
Size and mounting
- Diameter
- 225mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Depth
- 93mm
- Weight
- 1.8kg
Sensitivity shows 94.1 dB, calculated from the T/S values. B&C publishes 96.5 dB, 2.4 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 11.4T·m
- Fs
- 60Hz
- Le
- 0.40mH
- Re
- 4.9Ω
- Sd
- 220cm²
- Mms
- 20g
- Qes
- 0.31
- Qms
- 5.6
- Qts
- 0.29
- SPL
- 94.1dB
- Vas
- 23L
- Xmax
- 6mm
- Power
- 200W
- Impedance
- 8Ω
- Flux density
- 1.30T
- Sensitivity
- 96.5dB
- Low limit
- 60Hz
- Nominal power
- 200W
- Calculated sensitivity †
- 94.1dB
- High limit
- 4000Hz
- Manufacturer sensitivity
- 96.5dB
- Min. impedance
- 5.9Ω
- Voice coil
- 51mm
- Weight
- 1.8kg
- Diameter
- 225mm
- Depth
- 93mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Bl
- 11.4 Tm
- Fs
- 60 Hz
- Le
- 0.4 mH
- Re
- 4.9 Ω
- Sd
- 220 cm² (34.1 in²)
- Ebp
- 194 Hz
- Mms
- 20 g
- Qes
- 0.31
- Qms
- 5.6
- Qts
- 0.29
- Vas
- 23 dm³ (0.81 ft³)
- Η0
- 1.7 %
- Cone
- RCK008MBX518
- Xmax
- 6 mm
- Xvar
- 8 mm
- Depth
- 93 mm (3.66 in)
- Spider
- Single
- Cone shape
- Curvilinear
- Net weight
- 1.8 kg (3.97 lb)
- Pole design
- T-Pole
- Sensitivity
- 96.5 dB
- Flux density
- 1.3 T
- Shipping box
- 255x255x150 mm (10.04x10.04x5.91 in)
- Winding depth
- 15 mm (0.59 in)
- Shipping units
- 1 pcs
- Surround shape
- Triple Roll
- Former material
- Glass Fibre
- Frequency range
- 60 Hz - 4000 Hz
- Magnet material
- Neodymium Ring
- Shipping weight
- 2.25 kg (4.96 lb)
- Nominal diameter
- 200 mm (8 in)
- Overall diameter
- 225 mm (8.86 in)
- Winding material
- Aluminium
- Minimum impedance
- 5.9 Ω
- Nominal impedance
- 8 Ω
- Magnetic gap depth
- 7 mm (0.28 in)
- Recommended tuning
- 63 Hz
- Voice coil diameter
- 51 mm (2 in)
- Bolt circle diameter
- 210 mm (8.27 in)
- Recommended enclosure
- 19 dm³ (0.67 ft³)
- Woofer cone treatment
- Waterproof Impregnated Cone
- Baffle cutout diameter
- 187 mm (7.36 in)
- Nominal power handling
- 200 W
- Continuous power handling
- 400 W
- Flange and gasket thickness
- 9 mm (0.35 in)
- Air volume occupied by driver
- 1.1 dm³ (0.04 ft³)
B&C’s suggested box
From B&C’s 8MBX51 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 8MBX51. Clear differences are green when better and red when worse.
This driver8MBX51
Best price
£113.58
Fs
60 Hz
Qts
0.29
Vas
23 L
BL
11.4 T·m
Xmax
6 mm
Sensitivity
94.1 dB
Power
200 W
Sica8 D 1.5 CS
£58.57 · 48% less, betterFs62 Hz +3%
Qts0.30 +3%
Vas25.5 L +11%, worse
BL11.2 T·m –
Xmax2.5 mm −58%, worse
Sensitivity94.4 dB –
MonacorSP-8/150PRO
£60.60 · 47% less, betterFs56 Hz −7%
Qts0.32 +10%, worse
Vas22 L −4%
BL12.0 T·m +5%
Xmax6 mm –
Sensitivity91.8 dB −2.3, worse
Beyma8WRS300
£75.85 · 33% less, betterFs65 Hz +8%
Qts0.28 −3%
Vas15 L −35%, better
BL15.2 T·m +33%, better
Xmax6 mm –
Sensitivity93.4 dB −0.7
Beyma8P300FE
£79.99 · 30% less, betterFs53 Hz −12%, better
Qts0.31 +7%
Vas24.8 L +8%
BL11.6 T·m –
Xmax6 mm –
Sensitivity92.7 dB −1.4
B&C8FMB51
£80.08 · 29% less, betterFs67 Hz +12%, worse
Qts0.28 −3%
Vas20.7 L −10%, better
BL11.3 T·m –
Xmax5.5 mm −8%
Sensitivity95.1 dB +1
EminenceBETA 8CX
£95.86 · 16% less, betterFs62 Hz +3%
Qts0.29 –
Vas21.4 L −7%
BL11.2 T·m –
Xmax3.2 mm −47%, worse
Sensitivity94.2 dB –
B&C8FG51
£95.92 · 16% less, betterFs49 Hz −18%, better
Qts0.32 +10%, worse
Vas20 L −13%, better
BL12.9 T·m +13%, better
Xmax6.5 mm +8%
Sensitivity90.4 dB −3.7, worse
FaitalPRO8PR210
£100.24 · 12% less, betterFs65 Hz +8%
Qts0.29 –
Vas15.4 L −33%, better
BL13.5 T·m +18%, better
Xmax6.9 mm +15%, better
Sensitivity93.2 dB −0.9
FaitalPRO8RS350
£111.65 · 2% lessFs42 Hz −30%, better
Qts0.30 +3%
Vas23.7 L +3%
BL13.9 T·m +22%, better
Xmax7.4 mm +23%, better
Sensitivity89.6 dB −4.5, worse
Eighteen Sound8NMB420
£120.21 · 6% more, worseFs61 Hz –
Qts0.28 −3%
Vas33 L +43%, worse
BL10 T·m −12%, worse
Xmax5.8 mm −3%
Sensitivity95.9 dB +1.8
MonacorSPH-225C
£130.72 · 15% more, worseFs39 Hz −35%, better
Qts0.30 +3%
Vas24 L +4%
BL13.2 T·m +16%, better
Xmax6 mm –
Sensitivity88.6 dB −5.5, worse
SB AudienceROSSO-8CX250
£135.00 · 19% more, worseFs70 Hz +17%, worse
Qts0.32 +10%, worse
Vas15.8 L −31%, better
BL11.4 T·m –
Xmax5.4 mm −10%
Sensitivity93.7 dB –
B&C8FCX51
£178.00 · 57% more, worseFs69 Hz +15%, worse
Qts0.34 +17%, worse
Vas16 L −30%, better
BL11.5 T·m –
Xmax6 mm –
Sensitivity93.7 dB –
WavecorWF182BD03
£193.28 · 70% more, worseFs39 Hz −35%, better
Qts0.29 –
Vas24.4 L +6%
BL6.8 T·m −41%, worse
Xmax5.5 mm −8%
Sensitivity88.9 dB −5.2, worse
WavecorWF182BD08
£193.28 · 70% more, worseFs33 Hz −44%, better
Qts0.29 –
Vas32.4 L +41%, worse
BL8.5 T·m −25%, worse
Xmax5.5 mm −8%
Sensitivity88.1 dB −6, worse
WavecorWF182BD16
£194.38 · 71% more, worseFs37 Hz −38%, better
Qts0.30 +3%
Vas23 L –
BL8.5 T·m −25%, worse
Xmax5.5 mm −8%
Sensitivity87.8 dB −6.3, worse
B&C8CXN51
£225.53 · 99% more, worseFs68 Hz +13%, worse
Qts0.27 −7%
Vas17 L −26%, better
BL12.6 T·m +11%, better
Xmax6 mm –
Sensitivity94.7 dB +0.6
FaitalPRO8HX230
£236.82 · 109% more, worseFs70 Hz +17%, worse
Qts0.29 –
Vas14.7 L −36%, better
BL15 T·m +32%, better
Xmax6.2 mm –
Sensitivity94.1 dB –
FaitalPRO8HX240
£282.66 · 149% more, worseFs70 Hz +17%, worse
Qts0.30 +3%
Vas12.9 L −44%, better
BL13.8 T·m +21%, better
Xmax6.2 mm –
Sensitivity93.6 dB −0.5
Beyma8CX300ND
£321.98 · 183% more, worseFs61 Hz –
Qts0.29 –
Vas23 L –
BL12 T·m +5%
Xmax6 mm –
Sensitivity94.4 dB –
Eighteen Sound8CX650
£344.69 · 203% more, worseFs65 Hz +8%
Qts0.35 +21%, worse
Vas16.6 L −28%, better
BL12 T·m +5%
Xmax6 mm –
Sensitivity92.9 dB −1.2
AccutonC220-6-222
£1,018.55 · 797% more, worseFs30 Hz −51%, better
Qts0.26 −10%, better
Vas74 L +222%, worse
BL11.7 T·m –
Xmax6 mm –
Sensitivity90.5 dB −3.6, worse
Sica8 CX 2.5 PL P
No current priceFs74 Hz +23%, worse
Qts0.28 −3%
Vas16.2 L −30%, better
BL12.3 T·m +8%
Xmax5 mm −17%, worse
Sensitivity95.1 dB +1
CelestionTN0820
No current priceFs62 Hz +3%
Qts0.28 –
Vas21.9 L −5%
BL11.8 T·m +3%
Xmax2 mm −67%, worse
Sensitivity93.8 dB –
CIAREHSG200
No current priceFs38 Hz −37%, better
Qts0.31 +7%
Vas19 L −17%, better
BL11.8 T·m +4%
Xmax7.5 mm +25%, better
Sensitivity87 dB −7.1, worse
CIAREHSG200-4
No current priceFs38 Hz −37%, better
Qts0.31 +7%
Vas19 L −17%, better
BL11.8 T·m +4%
Xmax7.5 mm +25%, better
Sensitivity87 dB −7.1, worse
WavecorWF182BD15
No current priceFs39 Hz −35%, better
Qts0.32 +10%, worse
Vas20.8 L −10%
BL8.5 T·m −25%, worse
Xmax5.5 mm −8%
Sensitivity87.8 dB −6.3, worse
LavoceCAN082.00K
No current priceFs72 Hz +20%, worse
Qts0.27 −7%
Vas15.1 L −34%, better
BL13.2 T·m +15%, better
Xmax6.7 mm +12%, better
Sensitivity94.8 dB +0.7
PRV Audio8MB700FT
No current priceFs72 Hz +20%, worse
Qts0.31 +7%
Vas20 L −13%, better
BL12.3 T·m +7%
Xmax3.5 mm −42%, worse
Sensitivity95.6 dB +1.5
Tang BandW8-740P
No current priceFs30 Hz −50%, better
Qts0.28 −3%
Vas20.0 L −13%, better
BL13.7 T·m +20%, better
Xmax12.1 mm +102%, better
Sensitivity84.4 dB −9.7, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Blue Aran | £113.58, the lowest price | 8 in stock | Visit shop at Blue Aran | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £133.96 | 18% above the lowest price | In stock | Visit shop at JP Leisure |
JP Leisure | £133.96 | 18% above the lowest price | In stock | Visit shop at JP Leisure |
Parts Express Import VAT and duty may apply | £162.43 | 43% above the lowest price | 2 in stock | Visit shop at Parts Express |
Best price over time
Tracked since 1 Apr
Recent changes
- 23 JunJP Leisure£132.17 → £133.96Up 1.4% from £132.17
- 5 JunBlue Aran£134.32 → £113.58Down 15% from £134.32