SB AcousticsSB13PFC25-4
£22.98 · 91% less, betterFs44 Hz –
Qts0.29 +7%
Vas13.4 L +10%
BL5.3 T·m +8%
Xmax4.5 mm +50%, better
Sensitivity87.4 dB –
5-inch LF driver · MR13 series · 31 mm voice coil · 30 W
SB Acoustics MR13TX-4 4Ω
4 Ω
£251.15
SteadySoundImports · 4 in stock · Ships from Netherlands · All 2 offers
- Fs
- 44Hz
- Xmax
- 3mm
- SPL
- 88dB
- Pe
- 30W
- BL
- 4.9T·m
- Vd
- 21cm³
- Qts
- 0.27
- Vas
- 12L
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 confidence1,569 selected pixels of 2,698 - Trace datasheet-response-trace-poc/v1
60 degrees
Frequency response
240 plotted pointsMedium confidence1,126 selected pixels of 2,847
Published graphs
SB Acoustics MR13TX-4 is a 5-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 44 Hz, Qts 0.27, Vas 12.2 L, Xmax 3 mm, sensitivity 87.7 dB, plus 21 cm³ Vd and 157 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 £251.15.
The published T/S values agree with each other
Thiele/Small
- Fs
- 44Hz
- Qts
- 0.27
- Qes
- 0.28
- Qms
- 5.0
- Vas
- 12.2L
- Re
- 3.4Ω
- Le
- 0.11mH
Motor and cone
- BL
- 4.9T·m
- Sd
- 69cm²
- Mms
- 7g
- Xmax
- 3mm
- Vd †
- 21cm³
- Voice coil
- 31mm
- Flux density
- 1.08T
Power and response
- Sensitivity †
- 87.7dB
- Manufacturer sensitivity
- 90dB
- Power
- 30W
- Impedance
- 4Ω
- EBP †
- 157 · Leans vented
Size and mounting
- Weight
- 0.8kg
Other published values
- Cms
- 1.81mm/N
Sensitivity shows 87.7 dB, calculated from the T/S values. SB Acoustics publishes 90.0 dB, 2.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else SB Acoustics lists
LF · Primary · 5″
- BL
- 4.9T·m
- Fs
- 44Hz
- Le
- 0.11mH
- Re
- 3.4Ω
- Sd
- 69cm²
- Cms
- 1.81mm/N
- Mms
- 7g
- Qes
- 0.28
- Qms
- 5.0
- Qts
- 0.27
- SPL
- 87.7dB
- Vas
- 12.2L
- Xmax
- 3mm
- Power
- 30W
- Impedance
- 4Ω
- Flux density
- 1.08T
- Sensitivity
- 90dB
- Calculated sensitivity †
- 87.7dB
- Manufacturer sensitivity
- 90dB
- Voice coil
- 31mm
- Weight
- 0.8kg
02
Compare
Same-size drivers, compared with the MR13TX-4. Clear differences are green when better and red when worse.
This driverMR13TX-4
Best price
£251.15
Fs
44 Hz
Qts
0.27
Vas
12.2 L
BL
4.9 T·m
Xmax
3 mm
Sensitivity
87.7 dB
Power
30 W
SB AcousticsSB13PFCR25-4
£22.98 · 91% less, betterFs44 Hz –
Qts0.29 +7%
Vas13.4 L +10%
BL5.3 T·m +8%
Xmax4.5 mm +50%, better
Sensitivity87.4 dB –
SB AcousticsSB13PFCR25-4-COAX
£44.29 · 82% less, betterFs43 Hz –
Qts0.27 –
Vas14.4 L +18%, worse
BL5.1 T·m +4%
Xmax4.7 mm +55%, better
Sensitivity87.8 dB –
SB AcousticsSB13PFC25-4-COAX
£46.01 · 82% less, betterFs43 Hz –
Qts0.27 –
Vas14.4 L +18%, worse
BL5.1 T·m +4%
Xmax4.7 mm +55%, better
Sensitivity87.8 dB –
Scanspeak15W/8424G00
£49.40 · 80% less, betterFs46 Hz +5%
Qts0.25 −7%
Vas14.5 L +19%, worse
BL6.6 T·m +35%, better
Xmax2.6 mm −13%, worse
Sensitivity89.2 dB +1.5
Dayton AudioCF120-4
£52.29 · 79% less, betterFs53 Hz +21%, worse
Qts0.28 +4%
Vas4.9 L −60%, better
BL4.9 T·m –
Xmax3.5 mm +17%, better
Sensitivity85.6 dB −2.1, worse
Scanspeak15W/4424G00
£53.55 · 79% less, betterFs46 Hz +5%
Qts0.24 −11%, better
Vas13.8 L +13%, worse
BL5.2 T·m +6%
Xmax2.8 mm −7%
Sensitivity89.2 dB +1.5
Scanspeak12W/4524G00
£55.26 · 78% less, betterFs50 Hz +14%, worse
Qts0.27 –
Vas8.2 L −33%, better
BL4.4 T·m −10%, worse
Xmax3 mm –
Sensitivity87.4 dB –
CIAREHWB130
£61.12 · 76% less, betterFs46 Hz +5%
Qts0.28 +4%
Vas12.5 L –
BL5.6 T·m +14%, better
Xmax4.5 mm +50%, better
Sensitivity88.3 dB +0.6
FaitalPRO5PR120
£70.33 · 72% less, betterFs100 Hz +127%, worse
Qts0.27 –
Vas4.2 L −66%, better
BL10 T·m +104%, better
Xmax3.1 mm +3%
Sensitivity93.8 dB +6.1, better
B&C5FG44
£74.52 · 70% less, betterFs63 Hz +43%, worse
Qts0.27 –
Vas6.3 L −48%, better
BL10 T·m +104%, better
Xmax3 mm –
Sensitivity89.2 dB +1.5
SB AcousticsMR13PNW-8
£115.00 · 54% less, betterFs47 Hz +7%
Qts0.30 +11%, worse
Vas12.9 L +6%
BL6.2 T·m +27%, better
Xmax3 mm –
Sensitivity88.2 dB +0.5
SB AcousticsMR13P-4
£115.00 · 54% less, betterFs41 Hz −7%
Qts0.23 −15%, better
Vas19.4 L +59%, worse
BL4.3 T·m −12%, worse
Xmax3 mm –
Sensitivity89.3 dB +1.6
SB AcousticsMR13PNW-4
£115.00 · 54% less, betterFs41 Hz −7%
Qts0.23 −15%, better
Vas19.4 L +59%, worse
BL4.3 T·m −12%, worse
Xmax3 mm –
Sensitivity89.3 dB +1.6
SB AcousticsMR13P-8
£135.77 · 46% less, betterFs45 Hz –
Qts0.31 +15%, worse
Vas12.5 L –
BL6.1 T·m +24%, better
Xmax3 mm –
Sensitivity87.4 dB –
SB AcousticsMW13P-4
£139.69 · 44% less, betterFs41 Hz −7%
Qts0.27 –
Vas14.6 L +20%, worse
BL4.9 T·m –
Xmax5 mm +67%, better
Sensitivity87.4 dB –
SB AcousticsMW13PNW-4
£139.69 · 44% less, betterFs41 Hz −7%
Qts0.27 –
Vas14.6 L +20%, worse
BL4.9 T·m –
Xmax5 mm +67%, better
Sensitivity87.4 dB –
SB AcousticsMW16P-4
£146.49 · 42% less, betterFs28 Hz −36%, better
Qts0.27 –
Vas50.2 L +311%, worse
BL5.2 T·m +6%
Xmax6 mm +100%, better
Sensitivity88 dB –
SB AcousticsMW16PNW-4
£148.32 · 41% less, betterFs28 Hz −36%, better
Qts0.27 –
Vas51.8 L +325%, worse
BL5 T·m –
Xmax6 mm +100%, better
Sensitivity88 dB –
Scanspeak15M/4531K00
£150.70 · 40% less, betterFs42 Hz −5%
Qts0.27 –
Vas16 L +31%, worse
BL6 T·m +22%, better
Xmax3 mm –
Sensitivity88.3 dB +0.6
SB AcousticsMR16P-4
£159.05 · 37% less, betterFs31 Hz −30%, better
Qts0.25 −7%
Vas47.2 L +287%, worse
BL5.2 T·m +6%
Xmax3.1 mm +3%
Sensitivity89.4 dB +1.7
SB AcousticsMR16PNW-4
£159.05 · 37% less, betterFs31 Hz −30%, better
Qts0.25 −7%
Vas47.2 L +287%, worse
BL5.2 T·m +6%
Xmax3.1 mm +3%
Sensitivity89.4 dB +1.7
SB AcousticsMW13TX-4
£225.24 · 10% less, betterFs38 Hz −14%, better
Qts0.26 −4%
Vas16 L +31%, worse
BL5 T·m –
Xmax5 mm +67%, better
Sensitivity87.2 dB −0.5
PurifiPTT5.25X08-NFA-01
£334.88 · 33% more, worseFs32 Hz −27%, better
Qts0.27 –
Vas13.2 L +8%
BL9 T·m +84%, better
Xmax9.8 mm +227%, better
Sensitivity83.9 dB −3.8, worse
Acoustic EleganceTD6M-8
No current priceFs76 Hz +73%, worse
Qts0.27 –
Vas9.2 L −25%, better
BL10.6 T·m +116%, better
Xmax3 mm –
Sensitivity93.5 dB +5.8, better
PurifiPTT5.25M08-NAA-05
No current priceFs41 Hz −7%
Qts0.29 +7%
Vas9.4 L −23%, better
BL9.5 T·m +94%, better
Xmax2.9 mm −3%
Sensitivity85.4 dB −2.3, worse
PurifiPTT4.0M04-NAC-03
No current priceFs48 Hz +9%
Qts0.28 +4%
Vas5 L −59%, better
BL5.9 T·m +20%, better
Xmax2.9 mm −3%
Sensitivity84.7 dB −3, worse
PurifiPTT5.25X04-NAA-05
No current priceFs29 Hz −34%, better
Qts0.27 –
Vas11.8 L −3%
BL7.9 T·m +61%, better
Xmax9.8 mm +227%, better
Sensitivity82.1 dB −5.6, worse
PurifiPTT4.0M04-NFC-01
No current priceFs46 Hz +5%
Qts0.25 −7%
Vas5.4 L −56%, better
BL6 T·m +22%, better
Xmax2.9 mm −3%
Sensitivity84.9 dB −2.8, worse
PurifiPTT5.25M04-NAA-05
No current priceFs39 Hz −11%, better
Qts0.24 −11%, better
Vas9.9 L −19%, better
BL8.1 T·m +65%, better
Xmax2.9 mm −3%
Sensitivity85.7 dB −2, worse
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 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 |
|---|---|---|---|---|
SoundImports Import VAT and duty may apply | £251.15, the lowest price | 4 in stock | Visit shop at SoundImports | |
Lean Audio | £225.00 | Back order | Visit shop at Lean Audio |
Best price over time
Tracked since 1 Apr