- Net volume
- 14L
- Tuning
- 73Hz
B&C gives the volume and tuning; the port is sized for the driver when you open it.
8-inch LF driver · 8PS series · 51 mm voice coil · 200 W
B&C 8PS21 8Ω
8 Ω · 70–3000 Hz
£102.78
SteadyJP Leisure · In stock · All 8 offers
- Fs
- 73Hz
- Xmax
- 5mm
- SPL
- 94dB
- Pe
- 200W
- BL
- 12.6T·m
- Vd
- 110cm³
- Qts
- 0.33
- Vas
- 14L
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 74a9734f33e2…Medium confidence8,710 selected pixels of 9,376 - Trace datasheet-response-trace-poc/v2
free-air impedance
Impedance response
240 plotted pointsSource file SHA-256 74a9734f33e2…Medium confidence5,529 selected pixels of 6,647
Published graphs
B&C 8PS21 is an 8-inch 8 ohm LF driver rated at 200 W RMS. The validated T/S data includes Fs 73 Hz, Qts 0.33, Vas 14 L, Xmax 5 mm, sensitivity 93.8 dB, plus 110 cm³ Vd and 203 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 £80.83.
The published T/S values agree with each other
Thiele/Small
- Fs
- 73Hz
- Qts
- 0.33
- Qes
- 0.36
- Qms
- 4.2
- Vas
- 14L
- Re
- 5.4Ω
- Le
- 0.50mH
Motor and cone
- BL
- 12.6T·m
- Sd
- 220cm²
- Mms
- 23g
- Xmax
- 5mm
- Vd †
- 110cm³
- Voice coil
- 51mm
- Flux density
- 1.10T
Power and response
- Sensitivity †
- 93.8dB
- Manufacturer sensitivity
- 94dB
- Power
- 200W
- Nominal power
- 200W
- Impedance
- 8Ω
- Min. impedance
- 7Ω
- Range
- 70–3000Hz
- EBP †
- 203 · Leans vented
Size and mounting
- Diameter
- 225mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Depth
- 91mm
- Weight
- 3.3kg
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 12.6T·m
- Fs
- 73Hz
- Le
- 0.50mH
- Re
- 5.4Ω
- Sd
- 220cm²
- Mms
- 23g
- Qes
- 0.36
- Qms
- 4.2
- Qts
- 0.33
- SPL
- 93.8dB
- Vas
- 14L
- Xmax
- 5mm
- Power
- 200W
- Impedance
- 8Ω
- Flux density
- 1.10T
- Sensitivity
- 94dB
- Low limit
- 70Hz
- Nominal power
- 200W
- Calculated sensitivity †
- 93.8dB
- High limit
- 3000Hz
- Manufacturer sensitivity
- 94dB
- Min. impedance
- 7Ω
- Voice coil
- 51mm
- Weight
- 3.3kg
- Diameter
- 225mm
- Depth
- 91mm
- Cutout
- 187mm
- Bolt circle
- 210mm
- Bl
- 12.6 Tm
- Fs
- 73 Hz
- Le
- 0.5 mH
- Re
- 5.4 Ω
- Sd
- 220 cm² (34.1 in²)
- Ebp
- 203 Hz
- Mms
- 23 g
- Qes
- 0.36
- Qms
- 4.2
- Qts
- 0.33
- Vas
- 14 dm³ (0.49 ft³)
- Η0
- 1.5 %
- Cone
- RCK008PS218
- Xmax
- 5 mm
- Xvar
- 4 mm
- Depth
- 91 mm (3.6 in)
- Spider
- Single
- Cone shape
- Exponential
- Net weight
- 3.3 kg (7.28 lb)
- Pole design
- T-Pole
- Sensitivity
- 94 dB
- Flux density
- 1.1 T
- Shipping box
- 255x255x150 mm (10.04x10.04x5.91 in)
- Winding depth
- 16 mm (0.62 in)
- Shipping units
- 1 pcs
- Surround shape
- Double Roll
- Former material
- Kapton
- Frequency range
- 70 Hz - 3000 Hz
- Magnet material
- Ferrite
- Shipping weight
- 3.75 kg (8.27 lb)
- Nominal diameter
- 200 mm (8 in)
- Overall diameter
- 225 mm (8.8 in)
- Winding material
- Copper
- Minimum impedance
- 7 Ω
- Nominal impedance
- 8 Ω
- Magnetic gap depth
- 8 mm (0.31 in)
- Recommended tuning
- 73 Hz
- Voice coil diameter
- 51 mm (2 in)
- Bolt circle diameter
- 210 mm (8.3 in)
- Recommended enclosure
- 14 dm³ (0.49 ft³)
- Woofer cone treatment
- None
- 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
- 1.2 dm³ (0.04 ft³)
B&C’s suggested box
From B&C’s 8PS21 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 8PS21. Clear differences are green when better and red when worse.
This driver8PS21
Best price
£80.83
Fs
73 Hz
Qts
0.33
Vas
14 L
BL
12.6 T·m
Xmax
5 mm
Sensitivity
93.8 dB
Power
200 W
LavoceWSF081.82
£51.97 · 36% less, betterFs79 Hz +8%
Qts0.38 +15%, worse
Vas14.3 L –
BL11.3 T·m −11%, worse
Xmax4.6 mm −8%
Sensitivity94.2 dB –
CelestionTRUVOX 0820
£59.51 · 26% less, betterFs74 Hz –
Qts0.39 +18%, worse
Vas17.3 L +23%, worse
BL11.5 T·m −9%
Xmax5 mm –
Sensitivity94.3 dB +0.5
PRV Audio8MR600X-4
£67.72 · 16% less, betterFs77 Hz +6%
Qts0.34 +3%
Vas19.6 L +40%, worse
BL8.9 T·m −29%, worse
Xmax5.1 mm –
Sensitivity96 dB +2.2, better
CIAREFXI8
£68.59 · 15% less, betterFs81 Hz +11%, worse
Qts0.29 −12%, better
Vas13 L −7%
BL13.3 T·m +6%
Xmax4.5 mm −10%, worse
Sensitivity95.4 dB +1.6
Sica8 S 2.5 CP
£81.40 · Same priceFs54 Hz −26%, better
Qts0.33 –
Vas18.6 L +33%, worse
BL11.9 T·m −6%
Xmax5 mm –
Sensitivity91 dB −2.8, worse
CIARENDI8
£104.66 · 29% more, worseFs81 Hz +11%, worse
Qts0.33 –
Vas13 L −7%
BL12.8 T·m –
Xmax4.5 mm −10%, worse
Sensitivity94.9 dB +1.1
Sica8 FE 2 CP
£106.06 · 31% more, worseFs67 Hz −8%
Qts0.32 −3%
Vas16.9 L +21%, worse
BL12.3 T·m –
Xmax4.5 mm −10%, worse
Sensitivity93.4 dB –
WavecorSW178WA01
£122.32 · 51% more, worseFs38 Hz −48%, better
Qts0.36 +11%, worse
Vas12.2 L −13%, better
BL12 T·m −5%
Xmax5 mm –
Sensitivity84.6 dB −9.2, worse
LavoceWAN082.01
£128.77 · 59% more, worseFs85 Hz +16%, worse
Qts0.32 −3%
Vas9 L −36%, better
BL14.4 T·m +15%, better
Xmax5.8 mm +16%, better
Sensitivity94 dB –
SB AudienceROSSO-8CX250
£135.00 · 67% more, worseFs70 Hz −4%
Qts0.32 −3%
Vas15.8 L +13%, worse
BL11.4 T·m −10%
Xmax5.4 mm +8%
Sensitivity93.7 dB –
BMS8S215
£137.66 · 70% more, worseFs88 Hz +20%, worse
Qts0.31 −6%
Vas11.0 L −21%, better
BL13.6 T·m +8%
Xmax4.3 mm −15%, worse
Sensitivity95.6 dB +1.8
B&C8CX21
£151.61 · 88% more, worseFs74 Hz –
Qts0.36 +9%
Vas15 L +7%
BL11.5 T·m −9%
Xmax5.5 mm +10%, better
Sensitivity94 dB –
B&C8FCX51
£178.00 · 120% more, worseFs69 Hz −5%
Qts0.34 +3%
Vas16 L +14%, worse
BL11.5 T·m −9%
Xmax6 mm +20%, better
Sensitivity93.7 dB –
FaitalPRO8HX200
£252.95 · 213% more, worseFs76 Hz +4%
Qts0.30 −9%
Vas13.1 L −6%
BL13.8 T·m +10%
Xmax4.9 mm –
Sensitivity94.7 dB +0.9
Eighteen Sound8CX650
£344.69 · 326% more, worseFs65 Hz −11%, better
Qts0.35 +6%
Vas16.6 L +19%, worse
BL12 T·m −5%
Xmax6 mm +20%, better
Sensitivity92.9 dB −0.9
No photo
PHL Audio2440
No current priceFs77 Hz +5%
Qts0.31 −6%
Vas13.1 L −6%
BL12.8 T·m –
Xmax5 mm –
Sensitivity94.5 dB +0.7
No photo
PHL Audio2420
No current priceFs72 Hz –
Qts0.33 –
Vas13.3 L −5%
BL12.9 T·m –
Xmax5.5 mm +10%, better
Sensitivity93.3 dB −0.5
JensenBS8N250A-8
No current priceFs59 Hz −19%, better
Qts0.37 +12%, worse
Vas14.9 L +6%
BL12.8 T·m –
Xmax5 mm –
Sensitivity91 dB −2.8, worse
Sica8 CX 2.5 PL P
No current priceFs74 Hz –
Qts0.28 −15%, better
Vas16.2 L +16%, worse
BL12.3 T·m –
Xmax5 mm –
Sensitivity95.1 dB +1.3
JensenBP8150-8
No current priceFs75 Hz –
Qts0.33 –
Vas13.1 L −6%
BL13.3 T·m +5%
Xmax3.1 mm −38%, worse
Sensitivity93.8 dB –
CIARECMI200
No current priceFs80 Hz +10%
Qts0.34 +3%
Vas12 L −14%, better
BL9.6 T·m −24%, worse
Xmax4.5 mm −10%, worse
Sensitivity94.4 dB +0.6
B&C8CXN64
No current priceFs71 Hz –
Qts0.33 –
Vas10.5 L −25%, better
BL15.5 T·m +23%, better
Xmax5.5 mm +10%, better
Sensitivity92.3 dB −1.5
Oberton8MB201
No current priceFs68 Hz −7%
Qts0.31 −5%
Vas14.7 L +5%
BL12.5 T·m –
Xmax7 mm +40%, better
Sensitivity93.4 dB –
LavoceCAF082.00K
No current priceFs72 Hz –
Qts0.34 +3%
Vas15.1 L +8%
BL11.7 T·m −8%
Xmax6.7 mm +34%, better
Sensitivity93.7 dB –
HiViC8N
No current priceFs38 Hz −48%, better
Qts0.32 −3%
Vas47.8 L +241%, worse
BL10.7 T·m −15%, worse
Xmax4.9 mm –
Sensitivity90.7 dB −3.1, worse
HiViE8N
No current priceFs35 Hz −52%, better
Qts0.33 –
Vas52.5 L +275%, worse
BL10.4 T·m −17%, worse
Xmax4.9 mm –
Sensitivity89.9 dB −3.9, worse
Tang BandW8-1363SB
No current priceFs30 Hz −59%, better
Qts0.32 −3%
Vas15.4 L +10%
BL13.9 T·m +11%, better
Xmax12 mm +140%, better
Sensitivity82.8 dB −11, worse
Tang BandW8-740M
No current priceFs30 Hz −59%, better
Qts0.34 +3%
Vas14.7 L +5%
BL14.3 T·m +14%, better
Xmax12 mm +140%, better
Sensitivity82.3 dB −11.5, worse
Sica8 N 2.5 PL
No current priceFs77 Hz +5%
Qts0.30 −9%
Vas13.7 L –
BL12.9 T·m –
Xmax3.5 mm −30%, worse
Sensitivity94.8 dB +1
Sica8 L 2 SL
No current priceFs64 Hz −12%, better
Qts0.32 −3%
Vas18.2 L +30%, worse
BL12.3 T·m –
Xmax3.5 mm −30%, worse
Sensitivity93.3 dB −0.5
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express5.0 out of 54 ratings · Checked 7 Oct 2026Read reviews on Parts Express
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 | £102.78, the lowest price | In stock | Visit shop at JP Leisure | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £102.78 | In stock | Visit shop at JP Leisure | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £102.78 | In stock | Visit shop at JP Leisure | |
JP Leisure | £102.78 | In stock | Visit shop at JP Leisure | |
Blue Aran | £104.76 | 1.9% above the lowest price | 7 in stock | Visit shop at Blue Aran |
Blue Aran 3-5 months | £104.76 | 1.9% above the lowest price | Usually available in 3-5 months | Visit shop at Blue Aran |
Parts Express Import VAT and duty may apply | £122.21 | 19% above the lowest price | 8 in stock | Visit shop at Parts Express |
Best price over time
Tracked since 1 Apr
Recent changes
- 23 JunJP Leisure£93.53 → £102.78Up 9.9% from £93.53
- 23 JunJP Leisure£93.56 → £102.78Up 9.9% from £93.56
- 23 JunBlue Aran£104.82 → £104.76Down 0.1% from £104.82