PeerlessSDS-P830855
£14.18 · 69% less, betterFs66 Hz +8%
Qts0.48 –
Vas3.3 L −20%, better
BL5.2 T·m +46%, better
Xmax5.0 mm –
Sensitivity84.4 dB –
4-inch LF driver · SB12 series · 25 mm voice coil · 30 W
SB Acoustics SB12NRXF25-4 4Ω
4 Ω
- Fs
- 61Hz
- Xmax
- 5mm
- SPL
- 85dB
- Pe
- 30W
- BL
- 3.6T·m
- Vd
- 25cm³
- Qts
- 0.48
- Vas
- 4L
Published graphs
SB Acoustics SB12NRXF25-4 is a 4-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 61 Hz, Qts 0.48, Vas 4.1 L, Xmax 5 mm, sensitivity 84.5 dB, plus 25 cm³ Vd and 115 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 £45.28.
The published T/S values agree with each other
Thiele/Small
- Fs
- 61Hz
- Qts
- 0.48
- Qes
- 0.53
- Qms
- 5.3
- Vas
- 4.1L
- Re
- 3.1Ω
- Le
- 0.27mH
Motor and cone
- BL
- 3.6T·m
- Sd
- 50cm²
- Mms
- 6g
- Xmax
- 5mm
- Vd †
- 25cm³
- Voice coil
- 25mm
- Flux density
- 0.84T
Power and response
- Sensitivity †
- 84.5dB
- Manufacturer sensitivity
- 87dB
- Power
- 30W
- Impedance
- 4Ω
- EBP †
- 115 · Leans vented
Size and mounting
- Weight
- 0.75kg
Other published values
- Cms
- 1.17mm/N
Sensitivity shows 84.5 dB, calculated from the T/S values. SB Acoustics publishes 87.0 dB, 2.5 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else SB Acoustics lists
LF · Primary · 4″
- BL
- 3.6T·m
- Fs
- 61Hz
- Le
- 0.27mH
- Re
- 3.1Ω
- Sd
- 50cm²
- Cms
- 1.17mm/N
- Mms
- 6g
- Qes
- 0.53
- Qms
- 5.3
- Qts
- 0.48
- SPL
- 84.5dB
- Vas
- 4.1L
- Xmax
- 5mm
- Power
- 30W
- Impedance
- 4Ω
- Flux density
- 0.84T
- Sensitivity
- 87dB
- Calculated sensitivity †
- 84.5dB
- Manufacturer sensitivity
- 87dB
- Voice coil
- 25mm
- Weight
- 0.75kg
02
Compare
Same-size drivers, compared with the SB12NRXF25-4. Clear differences are green when better and red when worse.
This driverSB12NRXF25-4
Best price
£45.28
Fs
61 Hz
Qts
0.48
Vas
4.1 L
BL
3.6 T·m
Xmax
5 mm
Sensitivity
84.5 dB
Power
30 W
Dayton AudioND91-8
£21.16 · 53% less, betterFs71 Hz +16%, worse
Qts0.47 –
Vas1.5 L −63%, better
BL5.6 T·m +56%, better
Xmax5.1 mm –
Sensitivity82.1 dB −2.4, worse
SB AcousticsSB12PFCR25-4
£22.00 · 51% less, betterFs58 Hz −5%
Qts0.43 −10%, better
Vas5.2 L +27%, worse
BL3.5 T·m –
Xmax9.8 mm +96%, better
Sensitivity85.2 dB +0.7
SB AcousticsSB12PFC25-4
£22.25 · 51% less, betterFs58 Hz −5%
Qts0.43 −10%, better
Vas5.2 L +27%, worse
BL3.5 T·m –
Xmax5 mm –
Sensitivity85.2 dB +0.7
SB AcousticsSB12PFC25-8
£22.25 · 51% less, betterFs64 Hz +5%
Qts0.56 +17%, worse
Vas4.3 L +5%
BL4.5 T·m +25%, better
Xmax5 mm –
Sensitivity84.4 dB –
FaitalPRO5FE125
£29.24 · 35% less, betterFs65 Hz +7%
Qts0.48 –
Vas5.4 L +32%, worse
BL6.9 T·m +92%, better
Xmax5.3 mm +5%
Sensitivity86.7 dB +2.2, better
Dayton AudioDSA115-8
£30.44 · 33% less, betterFs63 Hz +4%
Qts0.42 −13%, better
Vas4.0 L −3%
BL5.4 T·m +51%, better
Xmax4.1 mm −18%, worse
Sensitivity84.8 dB –
VisatonW 100 S
£30.47 · 33% less, betterFs65 Hz +7%
Qts0.46 −4%
Vas4.5 L +10%
BL3.7 T·m –
Xmax4 mm −20%, worse
Sensitivity85.6 dB +1.1
Dayton AudioDMA105-4
£30.47 · 33% less, betterFs73 Hz +19%, worse
Qts0.51 +6%
Vas4.2 L +4%
BL3.4 T·m −6%
Xmax2.5 mm −50%, worse
Sensitivity86.2 dB +1.7
Dayton AudioRS125P-4
£37.81 · 17% less, betterFs70 Hz +15%, worse
Qts0.48 –
Vas4.0 L –
BL3.5 T·m −3%
Xmax4 mm −20%, worse
Sensitivity85.8 dB +1.3
Dayton AudioRS125P-8
£37.81 · 17% less, betterFs70 Hz +15%, worse
Qts0.44 −8%
Vas4.0 L –
BL5.1 T·m +41%, better
Xmax4 mm −20%, worse
Sensitivity86.1 dB +1.6
SB AcousticsSB12PFCR25-4-COAX
£41.40 · 9% less, betterFs58 Hz −5%
Qts0.33 −31%, better
Vas4.8 L +17%, worse
BL3.8 T·m +6%
Xmax5 mm –
Sensitivity86.2 dB +1.7
SB AcousticsSB12NRXF25-8
£45.28 · Same priceFs63 Hz +3%
Qts0.42 −13%, better
Vas4.2 L –
BL5.5 T·m +53%, better
Xmax5 mm –
Sensitivity85.6 dB +1.1
SB AcousticsSB12PACR25-4-COAX
£53.19 · 17% more, worseFs55 Hz −10%
Qts0.35 −27%, better
Vas4.3 L +5%
BL4 T·m +11%, better
Xmax5 mm –
Sensitivity84.8 dB –
Tang BandW4-1720
£83.20 · 84% more, worseFs60 Hz –
Qts0.42 −13%, better
Vas5.9 L +44%, worse
BL3.8 T·m +6%
Xmax5 mm –
Sensitivity86 dB +1.5
WavecorWF118WA05
£83.91 · 85% more, worseFs65 Hz +7%
Qts0.46 −4%
Vas3.5 L −15%, better
BL4.3 T·m +19%, better
Xmax3 mm −40%, worse
Sensitivity85 dB +0.5
WavecorSW118WA02
£85.78 · 89% more, worseFs60 Hz –
Qts0.47 –
Vas3.3 L −20%, better
BL5.9 T·m +64%, better
Xmax4 mm −20%, worse
Sensitivity83.6 dB −0.9
VisatonHX 10
£99.54 · 120% more, worseFs80 Hz +31%, worse
Qts0.50 +4%
Vas5.1 L +24%, worse
BL3.9 T·m +8%
Xmax1.5 mm −70%, worse
Sensitivity88.3 dB +3.8, better
WavecorWF120BD08
£122.14 · 170% more, worseFs63 Hz +3%
Qts0.45 −6%
Vas4.3 L +4%
BL5.5 T·m +53%, better
Xmax4 mm −20%, worse
Sensitivity85.4 dB +0.9
£169.48 · 274% more, worse
Fs49 Hz −20%, better
Qts0.45 −6%
Vas12 L +193%, worse
BL4.6 T·m +28%, better
Xmax5 mm –
Sensitivity86 dB +1.5
Tang BandW4-1879
£211.90 · 368% more, worseFs55 Hz −10%
Qts0.43 −10%, better
Vas9.1 L +122%, worse
BL4.2 T·m +16%, better
Xmax5 mm –
Sensitivity86.8 dB +2.3, better
Tang BandW4-2099
No current priceFs60 Hz –
Qts0.47 –
Vas2.8 L −33%, better
BL3.7 T·m +3%
Xmax3 mm −40%, worse
Sensitivity82.5 dB −2, worse
Dayton AudioCFC120-4
No current priceFs57 Hz −7%
Qts0.45 −6%
Vas4.5 L +9%
BL4.2 T·m +18%, better
Xmax2.5 mm −50%, worse
Sensitivity83.9 dB −0.6
WavecorSW084OM01
No current priceFs74 Hz +21%, worse
Qts0.44 −8%
Vas1.7 L −59%, better
BL3.6 T·m –
Xmax4.5 mm −10%, worse
Sensitivity83.8 dB −0.7
BMS5S117
No current priceFs95 Hz +56%, worse
Qts0.42 −13%, better
Vas3.3 L −21%, better
BL11.3 T·m +214%, better
Xmax5 mm –
Sensitivity89.6 dB +5.1, better
No photo
PHL Audio930ND
No current priceFs129 Hz +111%, worse
Qts0.48 –
Vas2.6 L −37%, better
BL8.8 T·m +144%, better
Xmax4.5 mm −10%, worse
Sensitivity92.1 dB +7.6, better
CelestionTF0512HE
No current priceFs85 Hz +39%, worse
Qts0.54 +12%, worse
Vas3.5 L −16%, better
BL6.7 T·m +86%, better
Xmax4.8 mm −5%
Sensitivity87.7 dB +3.2, better
BMS5N155
No current priceFs101 Hz +65%, worse
Qts0.44 −8%
Vas2.6 L −36%, better
BL12 T·m +233%, better
Xmax5 mm –
Sensitivity89.4 dB +4.9, better
Tang BandW3-926SDF
No current priceFs100 Hz +64%, worse
Qts0.49 –
Vas1.9 L −54%, better
BL3.7 T·m +3%
Xmax0.75 mm −85%, worse
Sensitivity87.5 dB +3, better
Dayton AudioDMA90-4
No current priceFs88 Hz +45%, worse
Qts0.45 −6%
Vas2.3 L −45%, better
BL3.5 T·m –
Xmax2.5 mm −50%, worse
Sensitivity86.5 dB +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 52 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 | £45.28, the lowest price | 2 in stock | Visit shop at Lean Audio | |
Lean Business | £45.28 | Stock not listed | Visit shop at Lean Business | |
Willys-Hifi | £51.73 | 14% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
Hifisound Import VAT and duty may apply · under 7 working days | £50.29 | 11% above the lowest price | Back order (under 7 working days) | Visit shop at Hifisound |
RumoH Import VAT and duty may apply | £52.50 | 16% above the lowest price | Stock not listed | Visit shop at RumoH |
SoundImports Import VAT and duty may apply | £52.93 | 17% above the lowest price | 8 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£53.95 → £51.73Down 4.1% from £53.95
- 30 SepWillys-Hifi£52.95 → £53.95Up 1.9% from £52.95
- 18 AugWillys-Hifi£53.95 → £52.95Down 1.9% from £53.95