SB AcousticsSB13PFC25-4
£22.98Fs44 Hz −32%, better
Qts0.29 +12%, worse
Vas13.4 L +176%, worse
BL5.3 T·m −21%, worse
Xmax4.5 mm –
Sensitivity87.4 dB −0.7
- Fs
- 65Hz
- Xmax
- 4.5mm
- SPL
- 88dB
- Pe
- 25W
- BL
- 6.7T·m
- Vd
- 26cm³
- Qts
- 0.26
- Vas
- 5L
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
spl
Frequency response
240 plotted pointsMedium confidence1,153 selected pixels of 1,906 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence2,632 selected pixels of 2,632
Tang Band W4-937SF is a 4-inch 8 ohm LF driver rated at 25 W RMS. The validated T/S data includes Fs 65 Hz, Qts 0.26, Vas 4.9 L, Xmax 4.5 mm, sensitivity 88.1 dB, plus 26 cm³ Vd and 197 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.
The published T/S values agree with each other
Thiele/Small
- Fs
- 65Hz
- Qts
- 0.26
- Qes
- 0.33
- Qms
- 1.2
- Vas
- 4.9L
- Re
- 6.8Ω
- Le
- 0.49mH
Motor and cone
- BL
- 6.7T·m
- Sd
- 57cm²
- Mms
- 5g
- Xmax
- 4.5mm
- Vd †
- 26cm³
Power and response
- Sensitivity †
- 88.1dB
- Manufacturer sensitivity
- 88dB
- Power
- 25W
- Impedance
- 8Ω
- EBP †
- 197 · Leans vented
Other published values
- Power Peak
- 50
Excursion and motor values come from the LF section; the frequency range spans every section.
† Calculated by bits from the published values
What this validation status means
Components and manufacturer details
LF · Primary · 4″
- BL
- 6.7T·m
- Fs
- 65Hz
- Le
- 0.49mH
- Re
- 6.8Ω
- Sd
- 57cm²
- Mms
- 5g
- Qes
- 0.33
- Qms
- 1.2
- Qts
- 0.26
- SPL
- 88.1dB
- Vas
- 4.9L
- Xmax
- 4.5mm
- Power
- 25W
- Impedance
- 8Ω
- Power Peak
- 50
- Sensitivity
- 88dB
- Calculated sensitivity †
- 88.1dB
- Manufacturer sensitivity
- 88dB
02
Compare
Same-size drivers, compared with the W4-937SF. Clear differences are green when better and red when worse.
This driverW4-937SF
Best price
–
Fs
65 Hz
Qts
0.26
Vas
4.9 L
BL
6.7 T·m
Xmax
4.5 mm
Sensitivity
88.1 dB
Power
25 W
SB AcousticsSB13PFCR25-4
£22.98Fs44 Hz −32%, better
Qts0.29 +12%, worse
Vas13.4 L +176%, worse
BL5.3 T·m −21%, worse
Xmax4.5 mm –
Sensitivity87.4 dB −0.7
SB AcousticsSB12PAC25-4
£23.67Fs53 Hz −19%, better
Qts0.31 +19%, worse
Vas5.3 L +9%
BL4.3 T·m −35%, worse
Xmax5 mm +11%, better
Sensitivity85.7 dB −2.4, worse
SB AcousticsSB12PACR25-4
£23.67Fs53 Hz −19%, better
Qts0.31 +19%, worse
Vas5.3 L +9%
BL4.3 T·m −35%, worse
Xmax5 mm +11%, better
Sensitivity85.7 dB −2.4, worse
CIAREHW100
£27.63Fs70 Hz +8%
Qts0.31 +19%, worse
Vas4.3 L −12%, better
BL5.6 T·m −16%, worse
Xmax4.3 mm −4%
Sensitivity88 dB –
CIAREHW131
£30.98Fs68 Hz +5%
Qts0.39 +50%, worse
Vas5.6 L +15%, worse
BL7.0 T·m +5%
Xmax4.4 mm –
Sensitivity87.9 dB –
Dayton AudioRS125-8
£37.39Fs59 Hz −9%
Qts0.34 +31%, worse
Vas4.8 L –
BL5.7 T·m −15%, worse
Xmax4 mm −11%, worse
Sensitivity85.8 dB −2.3, worse
Sica5 F 1.5 CP
£38.51Fs61 Hz −6%
Qts0.30 +15%, worse
Vas6.8 L +40%, worse
BL7.6 T·m +13%, better
Xmax3.5 mm −22%, worse
Sensitivity88.7 dB +0.6
SB AcousticsSB13PFCR25-4-COAX
£44.29Fs43 Hz −34%, better
Qts0.27 +4%
Vas14.4 L +196%, worse
BL5.1 T·m −24%, worse
Xmax4.7 mm +3%
Sensitivity87.8 dB –
SB AcousticsSB13PFC25-4-COAX
£46.01Fs43 Hz −34%, better
Qts0.27 +4%
Vas14.4 L +196%, worse
BL5.1 T·m −24%, worse
Xmax4.7 mm +3%
Sensitivity87.8 dB –
Dayton AudioCF120-4
£52.29Fs53 Hz −18%, better
Qts0.28 +8%
Vas4.9 L –
BL4.9 T·m −26%, worse
Xmax3.5 mm −22%, worse
Sensitivity85.6 dB −2.5, worse
SB AcousticsSB12CACS25-4
£58.31Fs51 Hz −22%, better
Qts0.31 +19%, worse
Vas5.7 L +17%, worse
BL4.3 T·m −36%, worse
Xmax5 mm +11%, better
Sensitivity85.6 dB −2.5, worse
CIAREHWB130
£60.29Fs48 Hz −26%, better
Qts0.30 +15%, worse
Vas12.5 L +157%, worse
BL7.2 T·m +8%
Xmax4.5 mm –
Sensitivity88.4 dB –
SEASH1152-08 CA12RCY
£79.46Fs57 Hz −12%, better
Qts0.31 +19%, worse
Vas5 L –
BL6.3 T·m −5%
Xmax3 mm −33%, worse
Sensitivity86.1 dB −2, worse
£89.46
Fs51 Hz −22%, better
Qts0.25 −4%
Vas12 L +147%, worse
BL6.8 T·m –
Xmax1.7 mm −62%, worse
Sensitivity89.3 dB +1.2
Tang BandW3-1878
£125.60Fs75 Hz +15%, worse
Qts0.28 +8%
Vas3.1 L −37%, better
BL4.3 T·m −36%, worse
Xmax4 mm −11%, worse
Sensitivity87.9 dB –
SB AcousticsMW13P-8
£139.69Fs42 Hz −36%, better
Qts0.30 +15%, worse
Vas15 L +209%, worse
BL5.7 T·m −15%, worse
Xmax5 mm +11%, better
Sensitivity87.1 dB −1
Tang BandW4-2315
£175.00Fs65 Hz –
Qts0.29 +12%, worse
Vas5.0 L –
BL6.2 T·m −7%
Xmax2.8 mm −38%, worse
Sensitivity88.5 dB –
SB AcousticsMW13TX-4
£225.24Fs38 Hz −42%, better
Qts0.26 –
Vas16 L +229%, worse
BL5 T·m −25%, worse
Xmax5 mm +11%, better
Sensitivity87.2 dB −0.9
PurifiPTT4.0M08-NAC-03
£251.15Fs50 Hz −23%, better
Qts0.32 +23%, worse
Vas4.9 L –
BL7 T·m +5%
Xmax2.9 mm −36%, worse
Sensitivity84.6 dB −3.5, worse
PurifiPTT4.0X04-NFC-01
£251.15Fs38 Hz −42%, better
Qts0.30 +15%, worse
Vas6.4 L +32%, worse
BL6 T·m −10%, worse
Xmax8.8 mm +96%, better
Sensitivity82.4 dB −5.7, worse
Scanspeak12MU/8731T00
£263.71Fs66 Hz –
Qts0.29 +12%, worse
Vas5.8 L +19%, worse
BL6.1 T·m −9%
Xmax3.4 mm −24%, worse
Sensitivity89.3 dB +1.2
Scanspeak12MU/4731T00
£267.60Fs64 Hz –
Qts0.24 −8%
Vas5.4 L +11%, worse
BL5.1 T·m −24%, worse
Xmax3.5 mm −22%, worse
Sensitivity89.4 dB +1.3
MorelSCW 636
£452.11Fs40 Hz −38%, better
Qts0.29 +12%, worse
Vas18.5 L +281%, worse
BL7.2 T·m +8%
Xmax5 mm +11%, better
Sensitivity87.3 dB −0.8
CIAREHWL100
No current priceFs70 Hz +8%
Qts0.31 +19%, worse
Vas4.3 L −12%, better
BL5.6 T·m −16%, worse
Xmax4.3 mm −4%
Sensitivity88 dB –
PurifiPTT4.0M04-NAC-03
No current priceFs48 Hz −26%, better
Qts0.28 +8%
Vas5 L –
BL5.9 T·m −12%, worse
Xmax2.9 mm −36%, worse
Sensitivity84.7 dB −3.4, worse
PurifiPTT4.0M08-NFC-01
No current priceFs48 Hz −26%, better
Qts0.31 +19%, worse
Vas5.3 L +9%
BL7 T·m +5%
Xmax2.9 mm −36%, worse
Sensitivity84.5 dB −3.6, worse
PurifiPTT4.0M04-NFC-01
No current priceFs46 Hz −29%, better
Qts0.25 −4%
Vas5.4 L +11%, worse
BL6 T·m −10%, worse
Xmax2.9 mm −36%, worse
Sensitivity84.9 dB −3.2, worse
PurifiPTT4.0X04-NAC-03
No current priceFs40 Hz −38%, better
Qts0.31 +19%, worse
Vas5.5 L +13%, worse
BL6.1 T·m −9%
Xmax8.8 mm +96%, better
Sensitivity82.2 dB −5.9, worse
Audio Technology5 H 52 17 06 SD
No current priceFs36 Hz −45%, better
Qts0.28 +8%
Vas34 L +600%, worse
BL6.6 T·m –
Xmax6.3 mm +40%, better
Sensitivity88.8 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
No current price found. Pricing may appear after the next vendor refresh.