Dayton AudioTCP115-4
£12.09 · 77% less, betterFs54 Hz –
Qts0.35 –
Vas3.1 L −28%, better
BL5.2 T·m +30%, better
Xmax4 mm −20%, worse
Sensitivity82.8 dB −2, worse
4-inch LF driver · SB12 series · 25 mm voice coil · 30 W
SB Acoustics SB12PACR25-4-COAX 4Ω
4 Ω
£57.77
SteadyLean Audio · 2 in stock · All 4 offers
- Fs
- 55Hz
- Xmax
- 5mm
- SPL
- 85dB
- Pe
- 30W
- BL
- 4T·m
- Vd
- 23cm³
- Qts
- 0.35
- Vas
- 4L
Published graphs
SB Acoustics SB12PACR25-4-COAX is a 4-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 55 Hz, Qts 0.35, Vas 4.3 L, Xmax 5 mm, sensitivity 84.8 dB, plus 23 cm³ Vd and 145 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 £53.19.
The published T/S values agree with each other
Thiele/Small
- Fs
- 55Hz
- Qts
- 0.35
- Qes
- 0.38
- Qms
- 4.8
- Vas
- 4.3L
- Re
- 3.1Ω
- Le
- 0.25mH
Motor and cone
- BL
- 4T·m
- Sd
- 45cm²
- Mms
- 6g
- Xmax
- 5mm
- Vd †
- 23cm³
- Voice coil
- 25mm
- Flux density
- 1.03T
Power and response
- Sensitivity †
- 84.8dB
- Manufacturer sensitivity
- 87.5dB
- Power
- 30W
- Impedance
- 4Ω
- EBP †
- 145 · Leans vented
Size and mounting
- Weight
- 0.9kg
Other published values
- Cms
- 1.49mm/N
Sensitivity shows 84.8 dB, calculated from the T/S values. SB Acoustics publishes 87.5 dB, 2.7 dB apart.
Excursion and motor values come from the LF section; the frequency range spans every section.
† Calculated by bits from the published values
What this validation status means
Components and manufacturer details
LF · Primary · 4″
- BL
- 4T·m
- Fs
- 55Hz
- Le
- 0.25mH
- Re
- 3.1Ω
- Sd
- 45cm²
- Cms
- 1.49mm/N
- Mms
- 6g
- Qes
- 0.38
- Qms
- 4.8
- Qts
- 0.35
- SPL
- 84.8dB
- Vas
- 4.3L
- Xmax
- 5mm
- Power
- 30W
- Impedance
- 4Ω
- Flux density
- 1.03T
- Sensitivity
- 87.5dB
- Calculated sensitivity †
- 84.8dB
- Manufacturer sensitivity
- 87.5dB
- Voice coil
- 25mm
- Weight
- 0.9kg
02
Compare
Same-size drivers, compared with the SB12PACR25-4-COAX. Clear differences are green when better and red when worse.
This driverSB12PACR25-4-COAX
Best price
£53.19
Fs
55 Hz
Qts
0.35
Vas
4.3 L
BL
4 T·m
Xmax
5 mm
Sensitivity
84.8 dB
Power
30 W
FaitalPRO5FE100
£21.36 · 60% less, betterFs65 Hz +18%, worse
Qts0.33 −6%
Vas6.1 L +42%, worse
BL6 T·m +50%, better
Xmax5.2 mm +4%
Sensitivity88.8 dB +4, better
SB AcousticsSB12PFC25-4
£22.25 · 58% less, betterFs58 Hz +5%
Qts0.43 +23%, worse
Vas5.2 L +21%, worse
BL3.5 T·m −13%, worse
Xmax5 mm –
Sensitivity85.2 dB –
FaitalPRO5FE120
£24.31 · 54% less, betterFs65 Hz +18%, worse
Qts0.38 +9%
Vas5 L +16%, worse
BL5.9 T·m +48%, better
Xmax5.2 mm +4%
Sensitivity87.4 dB +2.6, better
CIAREHW100
£27.97 · 47% less, betterFs70 Hz +27%, worse
Qts0.31 −11%, better
Vas4.3 L –
BL5.6 T·m +40%, better
Xmax4.3 mm −14%, worse
Sensitivity88 dB +3.2, better
CIAREPWA5.38
£37.58 · 29% less, betterFs78 Hz +42%, worse
Qts0.37 +6%
Vas4.5 L +5%
BL8.9 T·m +123%, better
Xmax3.9 mm −22%, worse
Sensitivity89.2 dB +4.4, better
Dayton AudioRS125-4
£37.81 · 29% less, betterFs57 Hz +4%
Qts0.37 +6%
Vas5.3 L +23%, worse
BL3.6 T·m −9%
Xmax4 mm −20%, worse
Sensitivity85.5 dB +0.7
Dayton AudioRS125-8
£37.81 · 29% less, betterFs59 Hz +8%
Qts0.34 –
Vas4.8 L +11%, worse
BL5.7 T·m +42%, better
Xmax4 mm −20%, worse
Sensitivity85.8 dB +1
SB AcousticsSB12PFCR25-4-COAX
£41.40 · 22% less, betterFs58 Hz +5%
Qts0.33 −6%
Vas4.8 L +12%, worse
BL3.8 T·m −5%
Xmax5 mm –
Sensitivity86.2 dB +1.4
SB AcousticsSB12NRXF25-4
£45.28 · 15% less, betterFs61 Hz +11%, worse
Qts0.48 +37%, worse
Vas4.1 L −5%
BL3.6 T·m −10%
Xmax5 mm –
Sensitivity84.5 dB –
SB AcousticsSB12MNRX2-25-4
£47.06 · 12% less, betterFs64 Hz +15%, worse
Qts0.32 −9%
Vas5.3 L +23%, worse
BL3.9 T·m –
Xmax4.4 mm −12%, worse
Sensitivity87.9 dB +3.1, better
WavecorWF118WA07
£47.66 · 10% less, betterFs56 Hz –
Qts0.36 –
Vas4.9 L +14%, worse
BL4.5 T·m +13%, better
Xmax4 mm −20%, worse
Sensitivity85.6 dB +0.8
SB AcousticsSB12PFC25-4-COAX
£48.27 · 9% less, betterFs58 Hz +5%
Qts0.33 −6%
Vas4.8 L +12%, worse
BL3.8 T·m −5%
Xmax5 mm –
Sensitivity86.2 dB +1.4
SB AcousticsSB12MNRX25-4
£52.93 · Same priceFs58 Hz +5%
Qts0.37 +6%
Vas5.5 L +28%, worse
BL3.7 T·m −7%
Xmax2.3 mm −55%, worse
Sensitivity86.1 dB +1.3
FaitalPRO5PR160
£66.11 · 24% more, worseFs90 Hz +64%, worse
Qts0.31 −11%, better
Vas3.7 L −14%, better
BL9.6 T·m +140%, better
Xmax5.1 mm –
Sensitivity91.2 dB +6.4, better
SB AcousticsSB15NAC30-8
£70.31 · 32% more, worseFs36 Hz −35%, better
Qts0.37 +6%
Vas17.7 L +312%, worse
BL5.9 T·m +48%, better
Xmax5 mm –
Sensitivity85.1 dB –
WavecorWF118WA01
£77.39 · 45% more, worseFs64 Hz +16%, worse
Qts0.36 –
Vas4.3 L –
BL4.6 T·m +15%, better
Xmax3 mm −40%, worse
Sensitivity86.8 dB +2, better
B&C5NDL38
£82.22 · 55% more, worseFs80 Hz +45%, worse
Qts0.36 –
Vas4.3 L –
BL9.2 T·m +130%, better
Xmax3.5 mm −30%, worse
Sensitivity89.8 dB +5, better
WavecorSW118WA01
£85.78 · 61% more, worseFs58 Hz +5%
Qts0.39 +11%, worse
Vas3.3 L −23%, better
BL4.7 T·m +18%, better
Xmax4 mm −20%, worse
Sensitivity84 dB −0.8
WavecorWF120BD11
£88.50 · 66% more, worseFs58 Hz +5%
Qts0.39 +11%, worse
Vas3.8 L −12%, better
BL4.2 T·m +5%
Xmax3 mm −40%, worse
Sensitivity84.7 dB –
BMS5CN160
£179.77 · 238% more, worseFs100 Hz +82%, worse
Qts0.36 –
Vas2.1 L −51%, better
BL10 T·m +150%, better
Xmax5 mm –
Sensitivity89.1 dB +4.3, better
Tang BandW5-1880
£211.90 · 298% more, worseFs48 Hz −13%, better
Qts0.32 −9%
Vas26.5 L +516%, worse
BL5.5 T·m +37%, better
Xmax5 mm –
Sensitivity90.9 dB +6.1, better
MorelTSCW 636
£436.51 · 721% more, worseFs43 Hz −22%, better
Qts0.36 –
Vas13.3 L +209%, worse
BL7.9 T·m +98%, better
Xmax5 mm –
Sensitivity86.4 dB +1.6
WavecorWF120BD04
No current priceFs62 Hz +12%, worse
Qts0.37 +6%
Vas4.3 L –
BL4.5 T·m +13%, better
Xmax4 mm −20%, worse
Sensitivity86 dB +1.2
WavecorWF120BD12
No current priceFs57 Hz –
Qts0.38 +9%
Vas3.9 L −9%
BL4.2 T·m +5%
Xmax3 mm −40%, worse
Sensitivity84.5 dB –
CIAREHWL100
No current priceFs70 Hz +27%, worse
Qts0.31 −11%, better
Vas4.3 L –
BL5.6 T·m +40%, better
Xmax4.3 mm −14%, worse
Sensitivity88 dB +3.2, better
Tang BandW3-2052S
No current priceFs50 Hz −9%
Qts0.34 –
Vas0.9 L −79%, better
BL6.8 T·m +69%, better
Xmax5 mm –
Sensitivity76.7 dB −8.1, worse
E J JordanEIKONA
No current priceFs43 Hz −22%, better
Qts0.35 –
Vas11.0 L +156%, worse
BL6.5 T·m +64%, better
Xmax5 mm –
Sensitivity85.3 dB +0.5
Tang BandW3-1750SB
No current priceFs50 Hz −9%
Qts0.37 +6%
Vas1.7 L −61%, better
BL8.0 T·m +100%, better
Xmax5 mm –
Sensitivity79.3 dB −5.5, worse
WavecorWF120BD06
No current priceFs48 Hz −13%, better
Qts0.40 +14%, worse
Vas6.2 L +44%, worse
BL4.1 T·m –
Xmax4 mm −20%, worse
Sensitivity84.2 dB −0.6
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.7 out of 53 ratings · Checked 12 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 |
|---|---|---|---|---|
Lean Audio | £57.77, the lowest price | 2 in stock | Visit shop at Lean Audio | |
Willys-Hifi | £64.92 | 12% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
RumoH Import VAT and duty may apply | £53.19 | Stock not listed | Visit shop at RumoH | |
SoundImports Import VAT and duty may apply | £58.02 | 0.4% above the lowest price | 6 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£66.95 → £64.92Down 3.0% from £66.95
- 11 AugWillys-Hifi£64.95 → £66.95Up 3.1% from £64.95
- 4 AugWillys-Hifi£62.95 → £64.95Up 3.2% from £62.95