FaitalPRO5FE105
£21.90 · Same priceFs65 Hz +12%, worse
Qts0.45 +5%
Vas5.7 L +10%
BL6.9 T·m +97%, better
Xmax5.3 mm +7%
Sensitivity87.2 dB +2, better
4-inch LF driver · SB12 series · 25 mm voice coil · 30 W
SB Acoustics SB12PFCR25-4 4Ω
4 Ω
£26.02
5.3%Willys-Hifi · All 4 offers
- Fs
- 58Hz
- Xmax
- 4.9mm
- SPL
- 85dB
- Pe
- 30W
- BL
- 3.5T·m
- Vd
- 25cm³
- Qts
- 0.43
- Vas
- 5L
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/v1
30 degrees
Frequency response
240 plotted pointsMedium confidence1,632 selected pixels of 2,962 - Trace datasheet-response-trace-poc/v1
60 degrees
Frequency response
240 plotted pointsMedium confidence1,172 selected pixels of 2,664
Published graphs
SB Acoustics SB12PFCR25-4 is a 4-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 58 Hz, Qts 0.43, Vas 5.2 L, Xmax 4.9 mm, sensitivity 85.2 dB, plus 25 cm³ Vd and 118 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 £21.73.
The published T/S values agree with each other
Thiele/Small
- Fs
- 58Hz
- Qts
- 0.43
- Qes
- 0.49
- Qms
- 3.4
- Vas
- 5.2L
- Re
- 3.1Ω
- Le
- 0.26mH
Motor and cone
- BL
- 3.5T·m
- Sd
- 50cm²
- Mms
- 5g
- Xmax
- 4.9mm
- Vd †
- 25cm³
- Voice coil
- 25mm
- Flux density
- 0.84T
Power and response
- Sensitivity †
- 85.2dB
- Manufacturer sensitivity
- 87.5dB
- Power
- 30W
- Impedance
- 4Ω
- EBP †
- 118 · Leans vented
Size and mounting
- Weight
- 0.7kg
Other published values
- Cms
- 1.42mm/N
Sensitivity shows 85.2 dB, calculated from the T/S values. SB Acoustics publishes 87.5 dB, 2.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else SB Acoustics lists
LF · Primary · 4″
- BL
- 3.5T·m
- Fs
- 58Hz
- Le
- 0.26mH
- Re
- 3.1Ω
- Sd
- 50cm²
- Cms
- 1.42mm/N
- Mms
- 5g
- Qes
- 0.49
- Qms
- 3.4
- Qts
- 0.43
- SPL
- 85.2dB
- Vas
- 5.2L
- Xmax
- 4.9mm
- Power
- 30W
- Impedance
- 4Ω
- Flux density
- 0.84T
- Sensitivity
- 87.5dB
- Calculated sensitivity †
- 85.2dB
- Manufacturer sensitivity
- 87.5dB
- Voice coil
- 25mm
- Weight
- 0.7kg
02
Compare
Same-size drivers, compared with the SB12PFCR25-4. Clear differences are green when better and red when worse.
This driverSB12PFCR25-4
Best price
£21.73
Fs
58 Hz
Qts
0.43
Vas
5.2 L
BL
3.5 T·m
Xmax
4.9 mm
Sensitivity
85.2 dB
Power
30 W
SB AcousticsSB12PFC25-4
£21.98 · 1% moreFs58 Hz –
Qts0.43 –
Vas5.2 L –
BL3.5 T·m –
Xmax5 mm –
Sensitivity85.2 dB –
SB AcousticsSB12PFCR25-8
£21.98 · 1% moreFs59 Hz –
Qts0.48 +12%, worse
Vas5.3 L –
BL4.6 T·m +31%, better
Xmax5 mm –
Sensitivity85 dB –
FaitalPRO5FE125
£28.89 · 33% more, worseFs65 Hz +12%, worse
Qts0.48 +12%, worse
Vas5.4 L +4%
BL6.9 T·m +97%, better
Xmax5.3 mm +7%
Sensitivity86.7 dB +1.5
Dayton AudioDS135-8
£29.91 · 38% more, worseFs53 Hz −9%
Qts0.39 −9%
Vas7.3 L +40%, worse
BL6.2 T·m +78%, better
Xmax4.8 mm –
Sensitivity85.4 dB –
VisatonW 100 S
£30.10 · 39% more, worseFs65 Hz +12%, worse
Qts0.46 +7%
Vas4.5 L −14%, better
BL3.7 T·m +6%
Xmax2 mm −59%, worse
Sensitivity85.6 dB –
CIAREHW131
£30.98 · 43% more, worseFs68 Hz +17%, worse
Qts0.39 −9%
Vas5.6 L +8%
BL7.0 T·m +101%, better
Xmax4.4 mm −10%, worse
Sensitivity87.9 dB +2.7, better
Dayton AudioRS125-4
£37.39 · 72% more, worseFs57 Hz –
Qts0.37 −14%, better
Vas5.3 L –
BL3.6 T·m +4%
Xmax4 mm −18%, worse
Sensitivity85.5 dB –
Dayton AudioRS125P-4
£37.39 · 72% more, worseFs70 Hz +21%, worse
Qts0.48 +12%, worse
Vas4.0 L −23%, better
BL3.5 T·m –
Xmax4 mm −18%, worse
Sensitivity85.8 dB +0.6
SB AcousticsSB12PFCR25-4-COAX
£41.40 · 91% more, worseFs58 Hz –
Qts0.33 −23%, better
Vas4.8 L −8%
BL3.8 T·m +9%
Xmax5 mm –
Sensitivity86.2 dB +1
SB AcousticsSB12NRXF25-4
£45.28 · 108% more, worseFs61 Hz +5%
Qts0.48 +12%, worse
Vas4.1 L −21%, better
BL3.6 T·m –
Xmax5 mm –
Sensitivity84.5 dB −0.7
SB AcousticsSB12NRXF25-8
£45.28 · 108% more, worseFs63 Hz +9%
Qts0.42 –
Vas4.2 L −19%, better
BL5.5 T·m +57%, better
Xmax5 mm –
Sensitivity85.6 dB –
SB AcousticsSB12NRX25-4
£46.34 · 113% more, worseFs55 Hz −5%
Qts0.40 −7%
Vas5.6 L +8%
BL3.6 T·m –
Xmax5 mm –
Sensitivity85.1 dB –
WavecorWF118WA08
£47.13 · 117% more, worseFs58 Hz –
Qts0.42 –
Vas4.9 L −6%
BL5.8 T·m +66%, better
Xmax4 mm −18%, worse
Sensitivity85.3 dB –
Tang BandW4-1052SDF
£47.37 · 118% more, worseFs70 Hz +21%, worse
Qts0.42 –
Vas5.2 L –
BL4.1 T·m +17%, better
Xmax2.6 mm −47%, worse
Sensitivity87.9 dB +2.7, better
SB AcousticsSB12PFC25-4-COAX
£47.68 · 119% more, worseFs58 Hz –
Qts0.33 −23%, better
Vas4.8 L −8%
BL3.8 T·m +9%
Xmax5 mm –
Sensitivity86.2 dB +1
SB AcousticsSB12NRX25-8
£51.87 · 139% more, worseFs57 Hz –
Qts0.37 −14%, better
Vas5.3 L –
BL5.4 T·m +54%, better
Xmax5 mm –
Sensitivity85.8 dB +0.6
SB AcousticsSB12MNRX25-4
£52.29 · 141% more, worseFs58 Hz –
Qts0.37 −14%, better
Vas5.5 L +6%
BL3.7 T·m +6%
Xmax2.3 mm −54%, worse
Sensitivity86.1 dB +0.9
SB AcousticsSB12PACR25-4-COAX
£52.54 · 142% more, worseFs55 Hz −5%
Qts0.35 −19%, better
Vas4.3 L −17%, better
BL4 T·m +14%, better
Xmax5 mm –
Sensitivity84.8 dB –
WavecorWF120BD05
£81.54 · 275% more, worseFs52 Hz −10%, better
Qts0.43 –
Vas5.3 L –
BL4.1 T·m +17%, better
Xmax4 mm −18%, worse
Sensitivity84.2 dB −1
Tang BandW4-1720
£82.28 · 279% more, worseFs60 Hz +3%
Qts0.42 –
Vas5.9 L +14%, worse
BL3.8 T·m +9%
Xmax5 mm –
Sensitivity86 dB +0.8
WavecorWF120BD08
£120.66 · 455% more, worseFs63 Hz +9%
Qts0.45 +5%
Vas4.3 L −18%, better
BL5.5 T·m +57%, better
Xmax4 mm −18%, worse
Sensitivity85.4 dB –
FaitalPRO5HX140
£133.13 · 513% more, worseFs100 Hz +72%, worse
Qts0.41 −5%
Vas3.4 L −35%, better
BL8 T·m +129%, better
Xmax5.1 mm +4%
Sensitivity90.8 dB +5.6, better
Tang BandW4-1879
£209.33 · 863% more, worseFs55 Hz −5%
Qts0.43 –
Vas9.1 L +75%, worse
BL4.2 T·m +20%, better
Xmax5 mm –
Sensitivity86.8 dB +1.6
WavecorSW084OM01
No current priceFs74 Hz +28%, worse
Qts0.44 –
Vas1.7 L −67%, better
BL3.6 T·m –
Xmax4.5 mm −8%
Sensitivity83.8 dB −1.4
BMS5S117
No current priceFs95 Hz +64%, worse
Qts0.42 –
Vas3.3 L −38%, better
BL11.3 T·m +223%, better
Xmax5 mm –
Sensitivity89.6 dB +4.4, better
Tang BandW4-1052SD
No current priceFs70 Hz +21%, worse
Qts0.44 –
Vas7.6 L +46%, worse
BL3.4 T·m –
Xmax3.4 mm −31%, worse
Sensitivity89.3 dB +4.1, better
BMS5C150
No current priceFs99 Hz +71%, worse
Qts0.43 –
Vas2.4 L −54%, better
BL11.4 T·m +226%, better
Xmax5 mm –
Sensitivity88.9 dB +3.7, better
WavecorWF120BD06
No current priceFs48 Hz −17%, better
Qts0.40 −7%
Vas6.2 L +19%, worse
BL4.1 T·m +17%, better
Xmax4 mm −18%, worse
Sensitivity84.2 dB −1
Beyma5CX200FE
No current priceFs82 Hz +41%, worse
Qts0.41 −5%
Vas5.3 L –
BL7.4 T·m +111%, better
Xmax5.7 mm +16%, better
Sensitivity90.4 dB +5.2, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports5.0 out of 54 ratings · Checked 25 Oct 2026Read reviews on SoundImports
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Willys-Hifi | £26.02, the lowest price | Stock not listed | Visit shop at Willys-Hifi | |
Lean Audio | £19.19 | Back order | Visit shop at Lean Audio | |
SoundImports Import VAT and duty may apply | £21.73 | 14 in stock | Visit shop at SoundImports | |
RumoH Import VAT and duty may apply | £21.98 | In stock | Visit shop at RumoH |
Best price over time
Tracked since 1 Apr
Recent changes
- 22 OctWillys-Hifi£24.70 → £26.02Up 5.3% from £24.70
- 1 OctWillys-Hifi£25.95 → £24.70Down 4.8% from £25.95
- 4 AugWillys-Hifi£24.95 → £25.95Up 4.0% from £24.95