- 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 16Ω
65–4000 Hz
£133.96
18%JP Leisure · In stock · All 5 offers
- Fs
- 68Hz
- Xmax
- 6mm
- SPL
- 94dB
- Pe
- 200W
- BL
- 13.7T·m
- Vd
- 132cm³
- Qts
- 0.38
- Vas
- 22L
Published graphs
B&C 8MBX51 is an 8-inch 16 ohm LF driver rated at 200 W RMS. The validated T/S data includes Fs 68 Hz, Qts 0.38, Vas 22 L, Xmax 6 mm, sensitivity 94.1 dB, plus 132 cm³ Vd and 158 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 £133.96.
The published T/S values agree with each other
Thiele/Small
- Fs
- 68Hz
- Qts
- 0.38
- Qes
- 0.43
- Qms
- 3.3
- Vas
- 22L
- Re
- 10.2Ω
- Le
- 0.65mH
Motor and cone
- BL
- 13.7T·m
- Sd
- 220cm²
- Mms
- 18g
- Xmax
- 6mm
- Vd †
- 132cm³
- Voice coil
- 51mm
- Flux density
- 1.30T
Power and response
- Sensitivity †
- 94.1dB
- Manufacturer sensitivity
- 97dB
- Power
- 200W
- Nominal power
- 200W
- Impedance
- 16Ω
- Min. impedance
- 11.2Ω
- Range
- 65–4000Hz
- EBP †
- 158 · 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 97.0 dB, 2.9 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 13.7T·m
- Fs
- 68Hz
- Le
- 0.65mH
- Re
- 10.2Ω
- Sd
- 220cm²
- Mms
- 18g
- Qes
- 0.43
- Qms
- 3.3
- Qts
- 0.38
- SPL
- 94.1dB
- Vas
- 22L
- Xmax
- 6mm
- Power
- 200W
- Impedance
- 16Ω
- Flux density
- 1.30T
- Sensitivity
- 97dB
- Low limit
- 65Hz
- Nominal power
- 200W
- Calculated sensitivity †
- 94.1dB
- High limit
- 4000Hz
- Manufacturer sensitivity
- 97dB
- Min. impedance
- 11.2Ω
- Voice coil
- 51mm
- Weight
- 1.8kg
- Diameter
- 225mm
- Depth
- 93mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Bl
- 13.7 Tm
- Fs
- 68 Hz
- Le
- 0.65 mH
- Re
- 10.2 Ω
- Sd
- 220 cm² (34.1 in²)
- Ebp
- 158 Hz
- Mms
- 18.4 g
- Qes
- 0.43
- Qms
- 3.3
- Qts
- 0.38
- Vas
- 22 dm³ (0.78 ft³)
- Η0
- 1.5 %
- Cone
- RCK008MBX5116
- Xmax
- 6 mm
- Xvar
- 5.5 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
- 97 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
- 65 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
- 11.2 Ω
- Nominal impedance
- 16 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
£133.96
Fs
68 Hz
Qts
0.38
Vas
22 L
BL
13.7 T·m
Xmax
6 mm
Sensitivity
94.1 dB
Power
200 W
Dayton AudioSIG180-4
£41.13 · 69% less, betterFs41 Hz −40%, better
Qts0.38 –
Vas23.2 L +5%
BL6.6 T·m −52%, worse
Xmax5 mm −17%, worse
Sensitivity87.8 dB −6.3, worse
FaneSOVEREIGN 8-225
£49.00 · 63% less, betterFs62 Hz −9%
Qts0.38 –
Vas22 L –
BL11 T·m −20%, worse
Xmax5.5 mm −8%
Sensitivity93 dB −1.1
CelestionTRUVOX 0820
£59.70 · 55% less, betterFs74 Hz +9%
Qts0.39 –
Vas17.3 L −22%, better
BL11.5 T·m −16%, worse
Xmax5 mm −17%, worse
Sensitivity94.3 dB –
MonacorSP-8/150PRO
£59.78 · 55% less, betterFs56 Hz −18%, better
Qts0.32 −16%, better
Vas22 L –
BL12.0 T·m −13%, worse
Xmax6 mm –
Sensitivity91.8 dB −2.3, worse
Dayton AudioRS180P-8
£59.83 · 55% less, betterFs46 Hz −33%, better
Qts0.34 −11%, better
Vas22 L –
BL7.2 T·m −48%, worse
Xmax6 mm –
Sensitivity88.8 dB −5.3, worse
LavoceWAF082.00
£71.42 · 47% less, betterFs78 Hz +15%, worse
Qts0.37 –
Vas11.9 L −46%, better
BL12.5 T·m −9%
Xmax6.3 mm +5%
Sensitivity93.4 dB −0.7
CIAREPWA8.50
£77.03 · 42% less, betterFs74 Hz +9%
Qts0.38 –
Vas12 L −45%, better
BL12.7 T·m −7%
Xmax6.8 mm +13%, better
Sensitivity92.8 dB −1.3
Dayton AudioRS180S-8
£78.62 · 41% less, betterFs38 Hz −45%, better
Qts0.36 −5%
Vas23 L +5%
BL7.3 T·m −47%, worse
Xmax6 mm –
Sensitivity86 dB −8.1, worse
SB AudienceBIANCO-8MWN150
£81.76 · 39% less, betterFs74 Hz +9%
Qts0.38 –
Vas9.9 L −55%, better
BL16.5 T·m +20%, better
Xmax6.0 mm –
Sensitivity92 dB −2.1, worse
CelestionCF0820BMB
£85.00 · 37% less, betterFs51 Hz −26%, better
Qts0.37 −4%
Vas22.4 L –
BL11.9 T·m −13%, worse
Xmax7.3 mm +21%, better
Sensitivity90.7 dB −3.4, worse
PRV Audio8MR600X
£94.57 · 29% less, betterFs77 Hz +13%, worse
Qts0.40 +5%
Vas20.0 L −9%
BL10.5 T·m −23%, worse
Xmax5.3 mm −13%, worse
Sensitivity95.3 dB +1.2
B&C8FMB51
£96.76 · 28% less, betterFs68 Hz –
Qts0.39 –
Vas20.5 L −7%
BL13.7 T·m –
Xmax5.5 mm −8%
Sensitivity93.8 dB –
B&C8FG51
£99.64 · 26% less, betterFs49 Hz −28%, better
Qts0.32 −16%, better
Vas20 L −9%
BL12.9 T·m −6%
Xmax6.5 mm +8%
Sensitivity90.4 dB −3.7, worse
Eighteen Sound8NMB420
£99.97 · 25% less, betterFs66 Hz –
Qts0.41 +8%
Vas24.5 L +12%, worse
BL12 T·m −12%, worse
Xmax5.8 mm −3%
Sensitivity93.8 dB –
Beyma8G40
£100.07 · 25% less, betterFs70 Hz –
Qts0.36 −5%
Vas17 L −23%, better
BL12.2 T·m −11%, worse
Xmax6.5 mm +8%
Sensitivity93.9 dB –
B&C8BG51
£110.00 · 18% less, betterFs52 Hz −24%, better
Qts0.40 +5%
Vas18 L −18%, better
BL11.8 T·m −14%, worse
Xmax6.5 mm +8%
Sensitivity89.8 dB −4.3, worse
B&C8CX21
£151.61 · 13% more, worseFs74 Hz +9%
Qts0.36 −5%
Vas15 L −32%, better
BL11.5 T·m −16%, worse
Xmax5.5 mm −8%
Sensitivity94 dB –
SB AudienceNERO-8MWN400D
£152.56 · 14% more, worseFs63 Hz −7%
Qts0.38 –
Vas13.9 L −37%, better
BL11.9 T·m −13%, worse
Xmax6.7 mm +12%, better
Sensitivity91.3 dB −2.8, worse
B&C8FCX51
£186.30 · 39% more, worseFs69 Hz –
Qts0.34 −11%, better
Vas16 L −27%, better
BL11.5 T·m −16%, worse
Xmax6 mm –
Sensitivity93.7 dB –
Eighteen Sound8CX650
£344.69 · 157% more, worseFs65 Hz −4%
Qts0.35 −8%
Vas16.6 L −25%, better
BL12 T·m −12%, worse
Xmax6 mm –
Sensitivity92.9 dB −1.2
No current price
Fs62 Hz −9%
Qts0.38 –
Vas22 L –
BL11 T·m −20%, worse
Xmax5.5 mm −8%
Sensitivity93 dB −1.1
Eighteen Sound8MB400
No current priceFs64 Hz −6%
Qts0.38 –
Vas23.9 L +9%
BL9.3 T·m −32%, worse
Xmax5.8 mm −3%
Sensitivity93.7 dB –
BMS8N519
No current priceFs75 Hz +10%, worse
Qts0.37 –
Vas10.9 L −50%, better
BL13.8 T·m –
Xmax6.3 mm +5%
Sensitivity92.5 dB −1.6
CelestionCNX0820
No current priceFs95 Hz +39%, worse
Qts0.40 +4%
Vas9.9 L −55%, better
BL12.0 T·m −12%, worse
Xmax6 mm –
Sensitivity94.7 dB +0.6
JensenBS8N250A-8
No current priceFs59 Hz −13%, better
Qts0.37 –
Vas14.9 L −32%, better
BL12.8 T·m −6%
Xmax5 mm −17%, worse
Sensitivity91 dB −3.1, worse
BMS8S219
No current priceFs82 Hz +21%, worse
Qts0.41 +8%
Vas9.7 L −56%, better
BL13.3 T·m –
Xmax6.3 mm +5%
Sensitivity92.8 dB −1.3
LavoceFBASS08-18
No current priceFs53 Hz −22%, better
Qts0.40 +5%
Vas23.6 L +7%
BL11.4 T·m −17%, worse
Xmax4.5 mm −25%, worse
Sensitivity91.2 dB −2.9, worse
Beyma8CFX260ND
No current priceFs100 Hz +47%, worse
Qts0.35 −8%
Vas8 L −64%, better
BL13.5 T·m –
Xmax6 mm –
Sensitivity95.4 dB +1.3
CIAREHSG200
No current priceFs39 Hz −43%, better
Qts0.36 −5%
Vas19 L −14%, better
BL14.9 T·m +9%
Xmax7.5 mm +25%, better
Sensitivity86.6 dB −7.5, worse
KartesianWOM200_VPA-S
No current priceFs53 Hz −22%, better
Qts0.35 −7%
Vas20.9 L −5%
BL11.8 T·m −14%, worse
Xmax6 mm –
Sensitivity92 dB −2.1, 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 |
|---|---|---|---|---|
JP Leisure | £133.96, the lowest price | In stock | Visit shop at JP Leisure | |
Blue Aran 4-6 weeks | £113.58 | Usually available in 4-6 weeks | Visit shop at Blue Aran | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £133.96 | In stock | Visit shop at JP Leisure |
Best price over time
Tracked since 1 Apr
Recent changes
- 23 JunJP Leisure£129.77 → £133.96Up 3.2% from £129.77
- 5 JunBlue Aran£131.63 → £113.58Down 14% from £131.63