SB AcousticsSB13PFC25-4
£22.98 · 83% less, betterFs44 Hz –
Qts0.29 −6%
Vas13.4 L +7%
BL5.3 T·m −13%, worse
Xmax4.5 mm +50%, better
Sensitivity87.4 dB –
5-inch LF driver · MR13 series · 31 mm voice coil · 30 W
SB Acoustics MR13P-8 8Ω
8 Ω
- Fs
- 45Hz
- Xmax
- 3mm
- SPL
- 87dB
- Pe
- 30W
- BL
- 6.1T·m
- Vd
- 21cm³
- Qts
- 0.31
- Vas
- 13L
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 confidence1,256 selected pixels of 2,584 - Trace datasheet-response-trace-poc/v1
60 degrees
Frequency response
240 plotted pointsMedium confidence1,265 selected pixels of 2,871
Published graphs
SB Acoustics MR13P-8 is a 5-inch 8 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 45 Hz, Qts 0.31, Vas 12.5 L, Xmax 3 mm, sensitivity 87.4 dB, plus 21 cm³ Vd and 136 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 £135.77.
The published T/S values agree with each other
Thiele/Small
- Fs
- 45Hz
- Qts
- 0.31
- Qes
- 0.33
- Qms
- 4.3
- Vas
- 12.5L
- Re
- 6.8Ω
- Le
- 0.11mH
Motor and cone
- BL
- 6.1T·m
- Sd
- 70cm²
- Mms
- 6g
- Xmax
- 3mm
- Vd †
- 21cm³
- Voice coil
- 31mm
- Flux density
- 1.08T
Power and response
- Sensitivity †
- 87.4dB
- Manufacturer sensitivity
- 88dB
- Power
- 30W
- Impedance
- 8Ω
- EBP †
- 136 · Leans vented
Size and mounting
- Weight
- 0.8kg
Other published values
- Cms
- 1.86mm/N
† Calculated by bits from the published values
What this validation status means
Everything else SB Acoustics lists
LF · Primary · 5″
- BL
- 6.1T·m
- Fs
- 45Hz
- Le
- 0.11mH
- Re
- 6.8Ω
- Sd
- 70cm²
- Cms
- 1.86mm/N
- Mms
- 6g
- Qes
- 0.33
- Qms
- 4.3
- Qts
- 0.31
- SPL
- 87.4dB
- Vas
- 12.5L
- Xmax
- 3mm
- Power
- 30W
- Impedance
- 8Ω
- Flux density
- 1.08T
- Sensitivity
- 88dB
- Calculated sensitivity †
- 87.4dB
- Manufacturer sensitivity
- 88dB
- Voice coil
- 31mm
- Weight
- 0.8kg
02
Compare
Same-size drivers, compared with the MR13P-8. Clear differences are green when better and red when worse.
This driverMR13P-8
Best price
£135.77
Fs
45 Hz
Qts
0.31
Vas
12.5 L
BL
6.1 T·m
Xmax
3 mm
Sensitivity
87.4 dB
Power
30 W
SB AcousticsSB13PFCR25-4
£22.98 · 83% less, betterFs44 Hz –
Qts0.29 −6%
Vas13.4 L +7%
BL5.3 T·m −13%, worse
Xmax4.5 mm +50%, better
Sensitivity87.4 dB –
Eighteen Sound5W430
£44.95 · 67% less, betterFs52 Hz +16%, worse
Qts0.32 +3%
Vas15 L +20%, worse
BL6.3 T·m +3%
Xmax6 mm +100%, better
Sensitivity89.7 dB +2.3, better
WavecorWF146WA06
£53.11 · 61% less, betterFs40 Hz −11%, better
Qts0.36 +16%, worse
Vas16.6 L +33%, worse
BL6.3 T·m +3%
Xmax3 mm –
Sensitivity86.5 dB −0.9
Scanspeak12W/8524G00
£54.43 · 60% less, betterFs52 Hz +16%, worse
Qts0.32 +3%
Vas8.2 L −34%, better
BL5.4 T·m −11%, worse
Xmax3 mm –
Sensitivity87.2 dB –
CIAREHWB130
£60.29 · 56% less, betterFs48 Hz +7%
Qts0.30 −3%
Vas12.5 L –
BL7.2 T·m +18%, better
Xmax4.5 mm +50%, better
Sensitivity88.4 dB +1
SEASH1152-08 CA12RCY
£79.46 · 41% less, betterFs57 Hz +27%, worse
Qts0.31 –
Vas5 L −60%, better
BL6.3 T·m +4%
Xmax3 mm –
Sensitivity86.1 dB −1.3
ETON5-512/C8/25 RP
£83.69 · 38% less, betterFs59 Hz +31%, worse
Qts0.34 +10%
Vas10 L −20%, better
BL5.9 T·m −3%
Xmax2.5 mm −17%, worse
Sensitivity89.7 dB +2.3, better
SB AcousticsMR13PNW-8
£115.00 · 15% less, betterFs47 Hz +4%
Qts0.30 −3%
Vas12.9 L +3%
BL6.2 T·m –
Xmax3 mm –
Sensitivity88.2 dB +0.8
SB AcousticsMW13PNW-8
£139.69 · 3% moreFs41 Hz −9%
Qts0.31 –
Vas15 L +20%, worse
BL5.7 T·m −7%
Xmax5 mm +67%, better
Sensitivity87 dB –
SB AcousticsMW13P-8
£139.69 · 3% moreFs42 Hz −8%
Qts0.30 −3%
Vas15 L +20%, worse
BL5.7 T·m −7%
Xmax5 mm +67%, better
Sensitivity87.1 dB –
WavecorWF152BD04
£142.76 · 5% more, worseFs50 Hz +11%, worse
Qts0.31 –
Vas11.4 L −9%
BL7.3 T·m +20%, better
Xmax4.5 mm +50%, better
Sensitivity88.4 dB +1
Scanspeak15M/4531K00
£150.70 · 11% more, worseFs42 Hz −7%
Qts0.27 −13%, better
Vas16 L +28%, worse
BL6 T·m –
Xmax3 mm –
Sensitivity88.3 dB +0.9
SB AcousticsMR16P-8
£159.05 · 17% more, worseFs32 Hz −29%, better
Qts0.30 −3%
Vas44.3 L +254%, worse
BL6.5 T·m +7%
Xmax3.1 mm +3%
Sensitivity88.6 dB +1.2
SB AcousticsMR16PNW-8
£159.05 · 17% more, worseFs31 Hz −31%, better
Qts0.32 +3%
Vas44.8 L +258%, worse
BL6.5 T·m +7%
Xmax3.1 mm +3%
Sensitivity88 dB +0.6
Scanspeak15M/8631G00
£167.42 · 23% more, worseFs42 Hz −7%
Qts0.35 +13%, worse
Vas16.2 L +30%, worse
BL6.8 T·m +11%, better
Xmax3 mm –
Sensitivity87.1 dB –
Tang BandW4-2315
£175.00 · 29% more, worseFs65 Hz +44%, worse
Qts0.29 −6%
Vas5.0 L −60%, better
BL6.2 T·m –
Xmax2.8 mm −7%
Sensitivity88.5 dB +1.1
SB AcousticsMW13TX-8
£225.24 · 66% more, worseFs40 Hz −11%, better
Qts0.32 +3%
Vas14.8 L +18%, worse
BL5.7 T·m −7%
Xmax5 mm +67%, better
Sensitivity86.5 dB −0.9
Scanspeak12M/4631G00
£242.78 · 79% more, worseFs75 Hz +67%, worse
Qts0.33 +6%
Vas2.3 L −82%, better
BL5.3 T·m −13%, worse
Xmax3 mm –
Sensitivity86.5 dB −0.9
SB AcousticsMR16TX-8
£249.00 · 83% more, worseFs35 Hz −22%, better
Qts0.31 –
Vas38.9 L +211%, worse
BL6.6 T·m +8%
Xmax2.9 mm −5%
Sensitivity89.2 dB +1.8
SB AcousticsMR13TX-4
£251.15 · 85% more, worseFs44 Hz –
Qts0.27 −13%, better
Vas12.2 L –
BL4.9 T·m −20%, worse
Xmax3 mm –
Sensitivity87.7 dB –
PurifiPTT4.0M08-NAC-03
£251.15 · 85% more, worseFs50 Hz +11%, worse
Qts0.32 +3%
Vas4.9 L −61%, better
BL7 T·m +15%, better
Xmax2.9 mm −3%
Sensitivity84.6 dB −2.8, worse
Scanspeak12MU/8731T00
£263.71 · 94% more, worseFs66 Hz +47%, worse
Qts0.29 −6%
Vas5.8 L −54%, better
BL6.1 T·m –
Xmax3.4 mm +13%, better
Sensitivity89.3 dB +1.9
Tang BandW4-1798S
No current priceFs60 Hz +33%, worse
Qts0.30 −3%
Vas7.4 L −41%, better
BL5.8 T·m −6%
Xmax3 mm –
Sensitivity88.4 dB +1
PurifiPTT4.0M08-NFC-01
No current priceFs48 Hz +7%
Qts0.31 –
Vas5.3 L −58%, better
BL7 T·m +15%, better
Xmax2.9 mm −3%
Sensitivity84.5 dB −2.9, worse
WavecorWF152BD10
No current priceFs49 Hz +9%
Qts0.32 +3%
Vas9.6 L −23%, better
BL5.8 T·m −5%
Xmax4.5 mm +50%, better
Sensitivity87.4 dB –
WavecorWF152BD06
No current priceFs45 Hz –
Qts0.29 −6%
Vas11.5 L −8%
BL6.3 T·m +4%
Xmax4.5 mm +50%, better
Sensitivity87.3 dB –
WavecorWF152BD14
No current priceFs45 Hz –
Qts0.29 −6%
Vas11.5 L −8%
BL6.3 T·m +4%
Xmax4.5 mm +50%, better
Sensitivity87.3 dB –
Tang BandW4-657D
No current priceFs70 Hz +56%, worse
Qts0.32 +3%
Vas5.6 L −55%, better
BL5.6 T·m −8%
Xmax3.3 mm +10%
Sensitivity89.4 dB +2, better
SB AcousticsSB17BAC35-8-COAX
No current priceFs35 Hz −22%, better
Qts0.33 +6%
Vas33.1 L +165%, worse
BL5.7 T·m −7%
Xmax3.1 mm +3%
Sensitivity88.1 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 52 ratings · Checked 26 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 | £135.77, the lowest price | 2 in stock | Visit shop at Lean Audio | |
Lean Business | £139.77 | 2.9% above the lowest price | Stock not listed | Visit shop at Lean Business |
Falcon Acoustics | £151.74 | 12% above the lowest price | Out of stock | Visit shop at Falcon Acoustics |
Willys-Hifi | £164.75 | 21% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
SoundImports Import VAT and duty may apply | £150.67 | 11% above the lowest price | 1 in stock | Visit shop at SoundImports |
RumoH Import VAT and duty may apply | £158.09 | 16% above the lowest price | Stock not listed | Visit shop at RumoH |
Lautsprechershop Import VAT and duty may apply | £160.48 | 18% above the lowest price | Special order | Visit shop at Lautsprechershop |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£168.95 → £164.75Down 2.5% from £168.95
- 28 SepWillys-Hifi£167.95 → £168.95Up 0.6% from £167.95
- 23 SepWillys-Hifi£168.95 → £167.95Down 0.6% from £168.95