SB AcousticsSB12PFCR25-4
£21.73 · 74% less, betterFs58 Hz −3%
Qts0.43 –
Vas5.2 L −12%, better
BL3.5 T·m −8%
Xmax4.9 mm –
Sensitivity85.2 dB −0.8
4-inch LF driver · 30 W
Tang Band W4-1720 4Ω
4 Ω
£82.28
SteadyParts Express · 43 in stock · Ships from United States · All 2 offers
- Fs
- 60Hz
- Xmax
- 5mm
- SPL
- 86dB
- Pe
- 30W
- BL
- 3.8T·m
- Vd
- 29cm³
- Qts
- 0.42
- Vas
- 6L
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 confidence947 selected pixels of 2,360 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence2,547 selected pixels of 2,547
Tang Band W4-1720 is a 4-inch 4 ohm LF driver rated at 30 W RMS. The validated T/S data includes Fs 60 Hz, Qts 0.42, Vas 5.9 L, Xmax 5 mm, sensitivity 86 dB, plus 29 cm³ Vd and 118 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 £82.28.
The published T/S values agree with each other
Thiele/Small
- Fs
- 60Hz
- Qts
- 0.42
- Qes
- 0.51
- Qms
- 2.3
- Vas
- 5.9L
- Re
- 3.8Ω
- Le
- 0.037mH
Motor and cone
- BL
- 3.8T·m
- Sd
- 57cm²
- Mms
- 5g
- Xmax
- 5mm
- Vd †
- 29cm³
Power and response
- Sensitivity †
- 86dB
- Manufacturer sensitivity
- 86dB
- Power
- 30W
- Impedance
- 4Ω
- EBP †
- 118 · Leans vented
Other published values
- Power Peak
- 60
† Calculated by bits from the published values
What this validation status means
Everything else Tang Band lists
LF · Primary · 4″
- BL
- 3.8T·m
- Fs
- 60Hz
- Le
- 0.037mH
- Re
- 3.8Ω
- Sd
- 57cm²
- Mms
- 5g
- Qes
- 0.51
- Qms
- 2.3
- Qts
- 0.42
- SPL
- 86dB
- Vas
- 5.9L
- Xmax
- 5mm
- Power
- 30W
- Impedance
- 4Ω
- Power Peak
- 60
- Sensitivity
- 86dB
- Calculated sensitivity †
- 86dB
- Manufacturer sensitivity
- 86dB
02
Compare
Same-size drivers, compared with the W4-1720. Clear differences are green when better and red when worse.
This driverW4-1720
Best price
£82.28
Fs
60 Hz
Qts
0.42
Vas
5.9 L
BL
3.8 T·m
Xmax
5 mm
Sensitivity
86 dB
Power
30 W
FaitalPRO5FE105
£21.90 · 73% less, betterFs65 Hz +8%
Qts0.45 +7%
Vas5.7 L −4%
BL6.9 T·m +81%, better
Xmax5.3 mm +5%
Sensitivity87.2 dB +1.2
SB AcousticsSB12PFC25-4
£21.98 · 73% less, betterFs58 Hz −3%
Qts0.43 –
Vas5.2 L −12%, better
BL3.5 T·m −8%
Xmax5 mm –
Sensitivity85.2 dB −0.8
SB AcousticsSB12PFCR25-8
£21.98 · 73% less, betterFs59 Hz –
Qts0.48 +14%, worse
Vas5.3 L −10%, better
BL4.6 T·m +20%, better
Xmax5 mm –
Sensitivity85 dB −1
FaitalPRO5FE125
£28.89 · 65% less, betterFs65 Hz +8%
Qts0.48 +14%, worse
Vas5.4 L −9%
BL6.9 T·m +81%, better
Xmax5.3 mm +5%
Sensitivity86.7 dB +0.7
Dayton AudioDS135-8
£29.91 · 64% less, betterFs53 Hz −13%, better
Qts0.39 −7%
Vas7.3 L +23%, worse
BL6.2 T·m +63%, better
Xmax4.8 mm −3%
Sensitivity85.4 dB −0.6
VisatonW 100 S
£30.10 · 63% less, betterFs65 Hz +8%
Qts0.46 +10%
Vas4.5 L −24%, better
BL3.7 T·m −3%
Xmax2 mm −60%, worse
Sensitivity85.6 dB –
CIAREHW131
£30.98 · 62% less, betterFs68 Hz +13%, worse
Qts0.39 −7%
Vas5.6 L −5%
BL7.0 T·m +84%, better
Xmax4.4 mm −12%, worse
Sensitivity87.9 dB +1.9
Dayton AudioRS125-4
£37.39 · 55% less, betterFs57 Hz −5%
Qts0.37 −12%, better
Vas5.3 L −11%, better
BL3.6 T·m −5%
Xmax4 mm −20%, worse
Sensitivity85.5 dB −0.5
SB AcousticsSB12PFCR25-4-COAX
£41.40 · 50% less, betterFs58 Hz −3%
Qts0.33 −21%, better
Vas4.8 L −19%, better
BL3.8 T·m –
Xmax5 mm –
Sensitivity86.2 dB –
SB AcousticsSB12NRXF25-4
£45.28 · 45% less, betterFs61 Hz –
Qts0.48 +14%, worse
Vas4.1 L −31%, better
BL3.6 T·m −6%
Xmax5 mm –
Sensitivity84.5 dB −1.5
SB AcousticsSB12NRXF25-8
£45.28 · 45% less, betterFs63 Hz +5%
Qts0.42 –
Vas4.2 L −29%, better
BL5.5 T·m +44%, better
Xmax5 mm –
Sensitivity85.6 dB –
SB AcousticsSB12NRX25-4
£46.34 · 44% less, betterFs55 Hz −8%
Qts0.40 −5%
Vas5.6 L −5%
BL3.6 T·m −6%
Xmax5 mm –
Sensitivity85.1 dB −0.9
Tang BandW4-1052SDF
£47.37 · 42% less, betterFs70 Hz +17%, worse
Qts0.42 –
Vas5.2 L −12%, better
BL4.1 T·m +7%
Xmax2.6 mm −48%, worse
Sensitivity87.9 dB +1.9
SB AcousticsSB12PFC25-4-COAX
£47.68 · 42% less, betterFs58 Hz −3%
Qts0.33 −21%, better
Vas4.8 L −19%, better
BL3.8 T·m –
Xmax5 mm –
Sensitivity86.2 dB –
SB AcousticsSB12NRX25-8
£51.87 · 37% less, betterFs57 Hz −5%
Qts0.37 −12%, better
Vas5.3 L −10%, better
BL5.4 T·m +41%, better
Xmax5 mm –
Sensitivity85.8 dB –
SB AcousticsSB12MNRX25-4
£52.29 · 36% less, betterFs58 Hz −3%
Qts0.37 −12%, better
Vas5.5 L −7%
BL3.7 T·m −3%
Xmax2.3 mm −55%, worse
Sensitivity86.1 dB –
Beyma5MP60
£52.32 · 36% less, betterFs63 Hz +5%
Qts0.46 +10%
Vas5.8 L –
BL6.4 T·m +68%, better
Xmax5.5 mm +10%, better
Sensitivity86 dB –
SB AcousticsSB12PACR25-4-COAX
£52.54 · 36% less, betterFs55 Hz −8%
Qts0.35 −17%, better
Vas4.3 L −27%, better
BL4 T·m +5%
Xmax5 mm –
Sensitivity84.8 dB −1.2
WavecorWF120BD05
£81.54 · Same priceFs52 Hz −13%, better
Qts0.43 –
Vas5.3 L −10%, better
BL4.1 T·m +7%
Xmax4 mm −20%, worse
Sensitivity84.2 dB −1.8
FaitalPRO5HX140
£133.13 · 62% more, worseFs100 Hz +67%, worse
Qts0.41 –
Vas3.4 L −43%, better
BL8 T·m +109%, better
Xmax5.1 mm –
Sensitivity90.8 dB +4.8, better
£167.42 · 103% more, worse
Fs49 Hz −18%, better
Qts0.45 +7%
Vas12 L +103%, worse
BL4.6 T·m +20%, better
Xmax5 mm –
Sensitivity86 dB –
Tang BandW4-1879
£209.33 · 154% more, worseFs55 Hz −8%
Qts0.43 –
Vas9.1 L +54%, worse
BL4.2 T·m +10%
Xmax5 mm –
Sensitivity86.8 dB +0.8
WavecorWF120BD06
No current priceFs48 Hz −20%, better
Qts0.40 −5%
Vas6.2 L +5%
BL4.1 T·m +7%
Xmax4 mm −20%, worse
Sensitivity84.2 dB −1.8
BMS5S117
No current priceFs95 Hz +58%, worse
Qts0.42 –
Vas3.3 L −45%, better
BL11.3 T·m +196%, better
Xmax5 mm –
Sensitivity89.6 dB +3.6, better
WavecorSW084OM01
No current priceFs74 Hz +23%, worse
Qts0.44 +5%
Vas1.7 L −71%, better
BL3.6 T·m −7%
Xmax4.5 mm −10%, worse
Sensitivity83.8 dB −2.2, worse
CIARECX131
No current priceFs83 Hz +38%, worse
Qts0.43 –
Vas6.8 L +15%, worse
BL4.6 T·m +20%, better
Xmax3.5 mm −30%, worse
Sensitivity91 dB +5, better
Tang BandW4-1052SD
No current priceFs70 Hz +17%, worse
Qts0.44 +5%
Vas7.6 L +28%, worse
BL3.4 T·m −10%
Xmax3.4 mm −32%, worse
Sensitivity89.3 dB +3.3, better
Beyma5CX200FE
No current priceFs82 Hz +37%, worse
Qts0.41 –
Vas5.3 L −10%, better
BL7.4 T·m +94%, better
Xmax5.7 mm +14%, better
Sensitivity90.4 dB +4.4, better
Dayton AudioCFC120-4
No current priceFs57 Hz −5%
Qts0.45 +7%
Vas4.5 L −25%, better
BL4.2 T·m +11%, better
Xmax2.5 mm −50%, worse
Sensitivity83.9 dB −2.1, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express4.8 out of 532 ratings · Checked 24 Oct 2026Read reviews on Parts Express
- SoundImports5.0 out of 52 ratings · Checked 24 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 |
|---|---|---|---|---|
Parts Express Import VAT and duty may apply | £82.28, the lowest price | 43 in stock | Visit shop at Parts Express | |
SoundImports Import VAT and duty may apply | £92.06 | 12% above the lowest price | Back order | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 17 AugParts Express£65.82 → £82.28Up 25% from £65.82