GRS4SMP-8
£12.10 · 46% less, betterFs63 Hz –
Qts0.65 +16%, worse
Vas4 L −7%
BL4.2 T·m −7%
Xmax4 mm −20%, worse
Sensitivity82.8 dB −1.6
4-inch LF driver · SB12 series · 25 mm voice coil · 30 W
SB Acoustics SB12PFC25-8 8Ω
8 Ω
£22.25
4.4%RumoH · Ships from Netherlands · All 2 offers
- Fs
- 64Hz
- Xmax
- 5mm
- SPL
- 84dB
- Pe
- 30W
- BL
- 4.5T·m
- Vd
- 25cm³
- Qts
- 0.56
- Vas
- 4L
Published graphs
SB Acoustics SB12PFC25-8 is a 4-inch 8 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 64 Hz, Qts 0.56, Vas 4.3 L, Xmax 5 mm, sensitivity 84.4 dB, plus 25 cm³ Vd and 98 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 £22.25.
The published T/S values agree with each other
Thiele/Small
- Fs
- 64Hz
- Qts
- 0.56
- Qes
- 0.65
- Qms
- 4.1
- Vas
- 4.3L
- Re
- 6.4Ω
- Le
- 0.36mH
Motor and cone
- BL
- 4.5T·m
- Sd
- 50cm²
- Mms
- 5g
- Xmax
- 5mm
- Vd †
- 25cm³
- Voice coil
- 25mm
- Flux density
- 0.84T
Power and response
- Sensitivity †
- 84.4dB
- Manufacturer sensitivity
- 84.5dB
- Power
- 30W
- Impedance
- 8Ω
- EBP †
- 98 · Sealed or vented
Size and mounting
- Weight
- 0.7kg
Other published values
- Cms
- 1.21mm/N
† Calculated by bits from the published values
What this validation status means
Everything else SB Acoustics lists
LF · Primary · 4″
- BL
- 4.5T·m
- Fs
- 64Hz
- Le
- 0.36mH
- Re
- 6.4Ω
- Sd
- 50cm²
- Cms
- 1.21mm/N
- Mms
- 5g
- Qes
- 0.65
- Qms
- 4.1
- Qts
- 0.56
- SPL
- 84.4dB
- Vas
- 4.3L
- Xmax
- 5mm
- Power
- 30W
- Impedance
- 8Ω
- Flux density
- 0.84T
- Sensitivity
- 84.5dB
- Calculated sensitivity †
- 84.4dB
- Manufacturer sensitivity
- 84.5dB
- Voice coil
- 25mm
- Weight
- 0.7kg
02
Compare
Same-size drivers, compared with the SB12PFC25-8. Clear differences are green when better and red when worse.
This driverSB12PFC25-8
Best price
£22.25
Fs
64 Hz
Qts
0.56
Vas
4.3 L
BL
4.5 T·m
Xmax
5 mm
Sensitivity
84.4 dB
Power
30 W
PeerlessSDS-100F25CP09-04
£13.05 · 41% less, betterFs80 Hz +25%, worse
Qts0.53 −5%
Vas2.0 L −54%, better
BL4.7 T·m +5%
Xmax5.0 mm –
Sensitivity84.4 dB –
VisatonFR 10
£13.65 · 39% less, betterFs90 Hz +41%, worse
Qts0.54 −4%
Vas2.3 L −47%, better
BL4.6 T·m –
Xmax4 mm −20%, worse
Sensitivity85.8 dB +1.4
PeerlessSDS-P830855
£14.18 · 36% less, betterFs66 Hz +3%
Qts0.48 −14%, better
Vas3.3 L −24%, better
BL5.2 T·m +16%, better
Xmax5.0 mm –
Sensitivity84.4 dB –
MonacorSPM-116/8
£16.87 · 24% less, betterFs75 Hz +17%, worse
Qts0.57 –
Vas4.5 L +5%
BL4.2 T·m −7%
Xmax1.5 mm −70%, worse
Sensitivity85.7 dB +1.3
PeerlessGBS-115N25AL01-04
£21.56 · 3% lessFs90 Hz +41%, worse
Qts0.63 +12%, worse
Vas1.8 L −58%, better
BL4.5 T·m –
Xmax4.8 mm −3%
Sensitivity84.3 dB –
Dayton AudioDMA105-8
£22.42 · Same priceFs72 Hz +13%, worse
Qts0.63 +12%, worse
Vas4.2 L –
BL4.5 T·m –
Xmax2.5 mm −50%, worse
Sensitivity84.8 dB –
VisatonW 100 S
£26.45 · 19% more, worseFs63 Hz –
Qts0.54 −4%
Vas5.4 L +26%, worse
BL4.3 T·m −5%
Xmax4 mm −20%, worse
Sensitivity85.1 dB +0.7
Dayton AudioDMA105-4
£30.47 · 37% more, worseFs73 Hz +14%, worse
Qts0.51 −9%
Vas4.2 L –
BL3.4 T·m −24%, worse
Xmax2.5 mm −50%, worse
Sensitivity86.2 dB +1.8
Dayton AudioND105-4
£30.85 · 39% more, worseFs79 Hz +23%, worse
Qts0.61 +9%
Vas2.0 L −54%, better
BL4.5 T·m –
Xmax4 mm −20%, worse
Sensitivity83.7 dB −0.7
CIAREPA100
£31.36 · 41% more, worseFs100 Hz +56%, worse
Qts0.59 +5%
Vas2.5 L −42%, better
BL4.4 T·m –
Xmax2.5 mm −50%, worse
Sensitivity87.6 dB +3.2, better
Dayton AudioRS125P-4
£37.81 · 70% more, worseFs70 Hz +9%
Qts0.48 −14%, better
Vas4.0 L −7%
BL3.5 T·m −22%, worse
Xmax4 mm −20%, worse
Sensitivity85.8 dB +1.4
SB AcousticsSB12NRXF25-4
£45.28 · 104% more, worseFs61 Hz −5%
Qts0.48 −14%, better
Vas4.1 L −5%
BL3.6 T·m −20%, worse
Xmax5 mm –
Sensitivity84.5 dB –
Dayton AudioRS125T-8
£47.80 · 115% more, worseFs76 Hz +19%, worse
Qts0.50 −11%, better
Vas3.6 L −17%, better
BL5.0 T·m +12%, better
Xmax2.8 mm −44%, worse
Sensitivity86.1 dB +1.7
SB AcousticsSB12PACR25-4-COAX
£53.19 · 139% more, worseFs55 Hz −14%, better
Qts0.35 −38%, better
Vas4.3 L –
BL4 T·m −11%, worse
Xmax5 mm –
Sensitivity84.8 dB –
CelestionTFX0412
£69.00 · 210% more, worseFs95 Hz +48%, worse
Qts0.59 +5%
Vas2.2 L −49%, better
BL5.4 T·m +20%, better
Xmax4 mm −20%, worse
Sensitivity86.5 dB +2.1, better
SEASH1304-08 MCA12RC
£77.45 · 248% more, worseFs68 Hz +6%
Qts0.56 –
Vas5 L +16%, worse
BL4.2 T·m −7%
Xmax0.9 mm −82%, worse
Sensitivity85.3 dB +0.9
WavecorWF118WA06
£83.91 · 277% more, worseFs66 Hz +3%
Qts0.55 –
Vas3.5 L −19%, better
BL5.6 T·m +24%, better
Xmax3 mm −40%, worse
Sensitivity84.3 dB –
VisatonHX 10
£99.54 · 347% more, worseFs80 Hz +25%, worse
Qts0.50 −11%, better
Vas5.1 L +19%, worse
BL3.9 T·m −13%, worse
Xmax1.5 mm −70%, worse
Sensitivity88.3 dB +3.9, better
£169.48 · 662% more, worse
Fs49 Hz −23%, better
Qts0.45 −20%, better
Vas12 L +179%, worse
BL4.6 T·m –
Xmax5 mm –
Sensitivity86 dB +1.6
MorelTSCM 634
£508.52 · 2186% more, worseFs49 Hz −23%, better
Qts0.53 −5%
Vas13.3 L +209%, worse
BL5.1 T·m +13%, better
Xmax5.3 mm +5%
Sensitivity86.5 dB +2.1, better
PeerlessSDS-100F25CP18-04
No current priceFs84 Hz +31%, worse
Qts0.59 +5%
Vas1.9 L −57%, better
BL4.5 T·m –
Xmax5.0 mm –
Sensitivity84.3 dB –
VisatonW 100 S - 8 Ohm
No current priceFs63 Hz –
Qts0.54 −4%
Vas5.4 L +26%, worse
BL4.3 T·m −5%
Xmax4 mm −20%, worse
Sensitivity85.1 dB +0.7
Dayton AudioCFC120-8
No current priceFs60 Hz −6%
Qts0.56 –
Vas4.6 L +7%
BL5.1 T·m +14%, better
Xmax2.5 mm −50%, worse
Sensitivity83.6 dB −0.8
HiViB4N
No current priceFs56 Hz −13%, better
Qts0.52 −7%
Vas4.5 L +5%
BL5.1 T·m +13%, better
Xmax3.2 mm −36%, worse
Sensitivity83 dB −1.4
WavecorSW084OM02
No current priceFs77 Hz +20%, worse
Qts0.53 −5%
Vas1.7 L −60%, better
BL4.6 T·m –
Xmax4.5 mm −10%, worse
Sensitivity83.4 dB −1
CelestionTF0512HE
No current priceFs85 Hz +32%, worse
Qts0.54 −4%
Vas3.5 L −20%, better
BL6.7 T·m +49%, better
Xmax4.8 mm −5%
Sensitivity87.7 dB +3.3, better
KartesianWIB120_VHE
No current priceFs68 Hz +6%
Qts0.56 –
Vas4.4 L –
BL4.0 T·m −12%, worse
Xmax4 mm −20%, worse
Sensitivity86 dB +1.6
WavecorMR120BD03
No current priceFs73 Hz +14%, worse
Qts0.56 –
Vas3.1 L −28%, better
BL5.2 T·m +16%, better
Xmax1.5 mm −70%, worse
Sensitivity85.1 dB +0.7
WavecorMR120BD04
No current priceFs72 Hz +13%, worse
Qts0.55 –
Vas3.2 L −26%, better
BL5.2 T·m +16%, better
Xmax1.5 mm −70%, worse
Sensitivity85.1 dB +0.7
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 51 rating · 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 |
|---|---|---|---|---|
RumoH Import VAT and duty may apply | £22.25, the lowest price | Stock not listed | Visit shop at RumoH | |
SoundImports Import VAT and duty may apply | £23.27 | 4.6% above the lowest price | 4 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr