SB AcousticsSB13PFCR25-4-COAX
£44.29 · 71% less, betterFs43 Hz –
Qts0.27 –
Vas14.4 L −10%
BL5.1 T·m −15%, worse
Xmax4.7 mm +55%, better
Sensitivity87.8 dB −0.5
6-inch LF driver · Revelator series · 38 mm voice coil · 50 W
Scanspeak 15M/4531K00 4Ω
4 Ω
- Fs
- 42Hz
- Xmax
- 3mm
- SPL
- 88dB
- Pe
- 50W
- BL
- 6T·m
- Vd
- 29cm³
- Qts
- 0.27
- Vas
- 16L
Scanspeak 15M/4531K00 is a 6-inch 4 ohm LF driver rated at 50 W RMS. The validated T/S data includes Fs 42 Hz, Qts 0.27, Vas 16 L, Xmax 3 mm, sensitivity 88.3 dB, plus 29 cm³ Vd and 150 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 £150.70.
The published T/S values agree with each other
Thiele/Small
- Fs
- 42Hz
- Qts
- 0.27
- Qes
- 0.28
- Qms
- 48
- Vas
- 16L
- Re
- 3.5Ω
- Le
- 0.16mH
Motor and cone
- BL
- 6T·m
- Sd
- 95cm²
- Mms
- 11g
- Xmax
- 3mm
- Vd †
- 29cm³
- Voice coil
- 38mm
Power and response
- Sensitivity †
- 88.3dB
- Manufacturer sensitivity
- 89.5dB
- Power
- 50W
- Impedance
- 4Ω
- Min. impedance
- 4.2Ω
- EBP †
- 150 · Leans vented
Size and mounting
- Diameter
- 150mm
Other published values
- Cms
- 1.30mm/N
- Rms
- 0.60kg/s
- Xmech
- 8
- Power Peak
- 150
Sensitivity shows 88.3 dB, calculated from the T/S values. Scanspeak publishes 89.5 dB, 1.2 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Scanspeak lists
LF · Primary · 6″
- BL
- 6T·m
- Fs
- 42Hz
- Le
- 0.16mH
- Re
- 3.5Ω
- Sd
- 95cm²
- Cms
- 1.30mm/N
- Mms
- 11g
- Qes
- 0.28
- Qms
- 48
- Qts
- 0.27
- Rms
- 0.60kg/s
- SPL
- 88.3dB
- Vas
- 16L
- Xmax
- 3mm
- Xmech
- 8
- Power
- 50W
- Impedance
- 4Ω
- Power Peak
- 150
- Sensitivity
- 89.5dB
- Calculated sensitivity †
- 88.3dB
- Manufacturer sensitivity
- 89.5dB
- Min. impedance
- 4.2Ω
- Voice coil
- 38mm
- Diameter
- 150mm
02
Compare
Same-size drivers, compared with the 15M/4531K00. Clear differences are green when better and red when worse.
This driver15M/4531K00
Best price
£150.70
Fs
42 Hz
Qts
0.27
Vas
16 L
BL
6 T·m
Xmax
3 mm
Sensitivity
88.3 dB
Power
50 W
SB AcousticsSB13PFC25-4-COAX
£46.01 · 69% less, betterFs43 Hz –
Qts0.27 –
Vas14.4 L −10%
BL5.1 T·m −15%, worse
Xmax4.7 mm +55%, better
Sensitivity87.8 dB −0.5
Scanspeak15W/8424G00
£49.40 · 67% less, betterFs46 Hz +10%
Qts0.25 −7%
Vas14.5 L −9%
BL6.6 T·m +10%
Xmax2.6 mm −13%, worse
Sensitivity89.2 dB +0.9
WavecorWF146WA06
£53.11 · 65% less, betterFs40 Hz −5%
Qts0.36 +33%, worse
Vas16.6 L +4%
BL6.3 T·m +5%
Xmax3 mm –
Sensitivity86.5 dB −1.8
Scanspeak15W/4424G00
£53.55 · 64% less, betterFs46 Hz +10%
Qts0.24 −11%, better
Vas13.8 L −14%, better
BL5.2 T·m −13%, worse
Xmax2.8 mm −7%
Sensitivity89.2 dB +0.9
Scanspeak12W/4524G00
£55.26 · 63% less, betterFs50 Hz +19%, worse
Qts0.27 –
Vas8.2 L −49%, better
BL4.4 T·m −27%, worse
Xmax3 mm –
Sensitivity87.4 dB −0.9
CIAREHWB130
£61.12 · 59% less, betterFs46 Hz +10%
Qts0.28 +4%
Vas12.5 L −22%, better
BL5.6 T·m −7%
Xmax4.5 mm +50%, better
Sensitivity88.3 dB –
FaitalPRO5PR120
£70.33 · 53% less, betterFs100 Hz +138%, worse
Qts0.27 –
Vas4.2 L −74%, better
BL10 T·m +67%, better
Xmax3.1 mm +3%
Sensitivity93.8 dB +5.5, better
B&C5FG44
£74.52 · 51% less, betterFs63 Hz +50%, worse
Qts0.27 –
Vas6.3 L −61%, better
BL10 T·m +67%, better
Xmax3 mm –
Sensitivity89.2 dB +0.9
SB AcousticsMR13PNW-8
£115.00 · 24% less, betterFs47 Hz +12%, worse
Qts0.30 +11%, worse
Vas12.9 L −19%, better
BL6.2 T·m +3%
Xmax3 mm –
Sensitivity88.2 dB –
SB AcousticsMR13P-4
£115.00 · 24% less, betterFs41 Hz –
Qts0.23 −15%, better
Vas19.4 L +21%, worse
BL4.3 T·m −28%, worse
Xmax3 mm –
Sensitivity89.3 dB +1
SB AcousticsMR13PNW-4
£115.00 · 24% less, betterFs41 Hz –
Qts0.23 −15%, better
Vas19.4 L +21%, worse
BL4.3 T·m −28%, worse
Xmax3 mm –
Sensitivity89.3 dB +1
SB AcousticsMR13P-8
£135.77 · 10% less, betterFs45 Hz +7%
Qts0.31 +15%, worse
Vas12.5 L −22%, better
BL6.1 T·m –
Xmax3 mm –
Sensitivity87.4 dB −0.9
SB AcousticsMW13P-4
£139.69 · 7% less, betterFs41 Hz –
Qts0.27 –
Vas14.6 L −9%
BL4.9 T·m −18%, worse
Xmax5 mm +67%, better
Sensitivity87.4 dB −0.9
SB AcousticsMW13PNW-4
£139.69 · 7% less, betterFs41 Hz –
Qts0.27 –
Vas14.6 L −9%
BL4.9 T·m −18%, worse
Xmax5 mm +67%, better
Sensitivity87.4 dB −0.9
SB AcousticsMW13P-8
£139.69 · 7% less, betterFs42 Hz –
Qts0.30 +11%, worse
Vas15 L −6%
BL5.7 T·m −5%
Xmax5 mm +67%, better
Sensitivity87.1 dB −1.2
WavecorWF182BD13
£157.84 · 5% moreFs38 Hz −10%
Qts0.26 −4%
Vas20.8 L +30%, worse
BL6.9 T·m +15%, better
Xmax5.5 mm +83%, better
Sensitivity88.3 dB –
SB AcousticsMR16P-4
£159.05 · 6% more, worseFs31 Hz −26%, better
Qts0.25 −7%
Vas47.2 L +195%, worse
BL5.2 T·m −13%, worse
Xmax3.1 mm +3%
Sensitivity89.4 dB +1.1
SB AcousticsMR16PNW-4
£159.05 · 6% more, worseFs31 Hz −26%, better
Qts0.25 −7%
Vas47.2 L +195%, worse
BL5.2 T·m −13%, worse
Xmax3.1 mm +3%
Sensitivity89.4 dB +1.1
SB AcousticsMR16P-8
£159.05 · 6% more, worseFs32 Hz −24%, better
Qts0.30 +11%, worse
Vas44.3 L +177%, worse
BL6.5 T·m +8%
Xmax3.1 mm +3%
Sensitivity88.6 dB –
SB AcousticsMW13TX-4
£225.24 · 49% more, worseFs38 Hz −10%
Qts0.26 −4%
Vas16 L –
BL5 T·m −17%, worse
Xmax5 mm +67%, better
Sensitivity87.2 dB −1.1
SB AcousticsMR13TX-4
£251.15 · 67% more, worseFs44 Hz +5%
Qts0.27 –
Vas12.2 L −24%, better
BL4.9 T·m −18%, worse
Xmax3 mm –
Sensitivity87.7 dB −0.6
Scanspeak12MU/8731T00
£263.71 · 75% more, worseFs66 Hz +57%, worse
Qts0.29 +7%
Vas5.8 L −64%, better
BL6.1 T·m –
Xmax3.4 mm +13%, better
Sensitivity89.3 dB +1
SB AcousticsMW19TX-4
£283.85 · 88% more, worseFs32 Hz −24%, better
Qts0.27 –
Vas53.2 L +233%, worse
BL6.3 T·m +5%
Xmax6.8 mm +127%, better
Sensitivity90 dB +1.7
Dayton AudioPS65LP-4
No current priceFs67 Hz +60%, worse
Qts0.24 −11%, better
Vas17.3 L +8%
BL6 T·m –
Xmax4 mm +33%, better
Sensitivity95.1 dB +6.8, better
Acoustic EleganceTD6M-8
No current priceFs76 Hz +81%, worse
Qts0.27 –
Vas9.2 L −43%, better
BL10.6 T·m +77%, better
Xmax3 mm –
Sensitivity93.5 dB +5.2, better
PurifiPTT6.5M04-NAA-08
No current priceFs36 Hz −14%, better
Qts0.27 –
Vas22.7 L +42%, worse
BL8.2 T·m +37%, better
Xmax2.9 mm −3%
Sensitivity87.8 dB −0.5
SB AcousticsMW19PF-4
No current priceFs29 Hz −31%, better
Qts0.27 –
Vas62.7 L +292%, worse
BL6.1 T·m –
Xmax6.5 mm +117%, better
Sensitivity89.4 dB +1.1
WavecorWF152BD06
No current priceFs45 Hz +6%
Qts0.29 +7%
Vas11.5 L −28%, better
BL6.3 T·m +6%
Xmax4.5 mm +50%, better
Sensitivity87.3 dB −1
WavecorWF152BD14
No current priceFs45 Hz +6%
Qts0.29 +7%
Vas11.5 L −28%, better
BL6.3 T·m +6%
Xmax4.5 mm +50%, better
Sensitivity87.3 dB −1
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 |
|---|---|---|---|---|
Hifi Collective | £150.70, the lowest price | 2 in stock | Visit shop at Hifi Collective | |
Willys-Hifi | £193.28 | 28% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
Wilmslow Audio | £196.80 | 31% above the lowest price | Stock not listed | Visit shop at Wilmslow Audio |
SoundImports Import VAT and duty may apply | £167.42 | 11% above the lowest price | 20 in stock | Visit shop at SoundImports |
Hifisound Import VAT and duty may apply · under 7 working days | £177.09 | 18% above the lowest price | Back order (under 7 working days) | Visit shop at Hifisound |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£197.95 → £193.28Down 2.4% from £197.95
- 28 SepWillys-Hifi£196.95 → £197.95Up 0.5% from £196.95
- 23 SepWillys-Hifi£197.95 → £196.95Down 0.5% from £197.95