SB AcousticsSB12PAC25-4
£23.67 · 90% less, betterFs53 Hz +17%, worse
Qts0.31 –
Vas5.3 L −52%, better
BL4.3 T·m −36%, worse
Xmax5 mm −9%
Sensitivity85.7 dB –
3-inch LF driver · ELITE series · 75 mm voice coil · 150 W
Morel ECW 536 6Ω
6 Ω
- Fs
- 45Hz
- Xmax
- 5.5mm
- SPL
- 86dB
- Pe
- 150W
- BL
- 6.8T·m
- Vd
- 48cm³
- Qts
- 0.31
- Vas
- 11L
Morel ECW 536 is a 3-inch 6 ohm LF driver rated at 150 W RMS. The validated T/S data includes Fs 45 Hz, Qts 0.31, Vas 11 L, Xmax 5.5 mm, sensitivity 86.1 dB, plus 48 cm³ Vd and 115 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 £236.12.
The published T/S values agree with each other
Thiele/Small
- Fs
- 45Hz
- Qts
- 0.31
- Qes
- 0.39
- Qms
- 1.6
- Vas
- 11L
- Re
- 4.5Ω
- Le
- 0.28mH
Motor and cone
- BL
- 6.8T·m
- Sd
- 88cm²
- Mms
- 15g
- Xmax
- 5.5mm
- Vd †
- 48cm³
- Voice coil
- 75mm
- Flux density
- 0.87T
Power and response
- Sensitivity †
- 86.1dB
- Manufacturer sensitivity
- 1000dB
- Power
- 150W
- Nominal power
- 150W
- Impedance
- 6Ω
- EBP †
- 115 · Leans vented
Size and mounting
- Diameter
- 143mm
- Depth
- 65mm
- Weight
- 1.1kg
Other published values
- Cms
- 0.86mm/N
- Rms
- 2.66kg/s
Sensitivity shows 86.1 dB, calculated from the T/S values. Morel publishes 1000.0 dB, 913.9 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Morel lists
LF · Primary · 3″
- BL
- 6.8T·m
- Fs
- 45Hz
- Le
- 0.28mH
- Re
- 4.5Ω
- Sd
- 88cm²
- Cms
- 0.86mm/N
- Mms
- 15g
- Qes
- 0.39
- Qms
- 1.6
- Qts
- 0.31
- Rms
- 2.66kg/s
- SPL
- 86.1dB
- Vas
- 11L
- Xmax
- 5.5mm
- Power
- 150W
- Impedance
- 6Ω
- Flux density
- 0.87T
- Sensitivity
- 1000dB
- Nominal power
- 150W
- Calculated sensitivity †
- 86.1dB
- Manufacturer sensitivity
- 1000dB
- Voice coil
- 75mm
- Weight
- 1.1kg
- Diameter
- 143mm
- Depth
- 65mm
02
Compare
Same-size drivers, compared with the ECW 536. Clear differences are green when better and red when worse.
This driverECW 536
Best price
£236.12
Fs
45 Hz
Qts
0.31
Vas
11 L
BL
6.8 T·m
Xmax
5.5 mm
Sensitivity
86.1 dB
Power
150 W
SB AcousticsSB12PACR25-4
£23.67 · 90% less, betterFs53 Hz +17%, worse
Qts0.31 –
Vas5.3 L −52%, better
BL4.3 T·m −36%, worse
Xmax5 mm −9%
Sensitivity85.7 dB –
CIAREHW100
£27.63 · 88% less, betterFs70 Hz +56%, worse
Qts0.31 –
Vas4.3 L −61%, better
BL5.6 T·m −18%, worse
Xmax4.3 mm −22%, worse
Sensitivity88 dB +1.9
Tang BandW4-2142
£57.77 · 76% less, betterFs60 Hz +33%, worse
Qts0.33 +6%
Vas6.4 L −42%, better
BL5.4 T·m −21%, worse
Xmax2.4 mm −56%, worse
Sensitivity87.5 dB +1.4
SB AcousticsSB12CACS25-4
£58.31 · 75% less, betterFs51 Hz +13%, worse
Qts0.31 –
Vas5.7 L −48%, better
BL4.3 T·m −37%, worse
Xmax5 mm −9%
Sensitivity85.6 dB −0.5
SB AcousticsSB12CACS25-8
£58.31 · 75% less, betterFs51 Hz +13%, worse
Qts0.37 +19%, worse
Vas6.5 L −41%, better
BL5.2 T·m −24%, worse
Xmax5 mm −9%
Sensitivity85.4 dB −0.7
MorelTIW 638ND
£165.79 · 30% less, betterFs43 Hz −4%
Qts0.40 +29%, worse
Vas15.5 L +41%, worse
BL7.7 T·m +13%, better
Xmax5.3 mm −5%
Sensitivity86.5 dB –
MorelTIW 634ND
£205.14 · 13% less, betterFs40 Hz −11%, better
Qts0.36 +16%, worse
Vas16.5 L +50%, worse
BL6.5 T·m −5%
Xmax5.5 mm –
Sensitivity86.4 dB –
MorelEW 536
£209.29 · 11% less, betterFs45 Hz –
Qts0.22 −29%, better
Vas10.3 L −6%
BL7.7 T·m +13%, better
Xmax5.5 mm –
Sensitivity87.3 dB +1.2
MorelEW 638
£226.03 · 4% lessFs39 Hz −13%, better
Qts0.32 +3%
Vas20.3 L +84%, worse
BL7.0 T·m +3%
Xmax6 mm +9%
Sensitivity86.9 dB +0.8
PurifiPTT4.0M08-NAC-03
£251.15 · 6% more, worseFs50 Hz +11%, worse
Qts0.32 +3%
Vas4.9 L −55%, better
BL7 T·m –
Xmax2.9 mm −47%, worse
Sensitivity84.6 dB −1.5
PurifiPTT4.0X04-NFC-01
£251.15 · 6% more, worseFs38 Hz −16%, better
Qts0.30 −3%
Vas6.4 L −42%, better
BL6 T·m −12%, worse
Xmax8.8 mm +60%, better
Sensitivity82.4 dB −3.7, worse
MorelTICW 634ND
£271.71 · 15% more, worseFs40 Hz −11%, better
Qts0.35 +13%, worse
Vas17.3 L +57%, worse
BL6.6 T·m −3%
Xmax5.5 mm –
Sensitivity86.8 dB +0.7
MorelECW 638
£293.02 · 24% more, worseFs39 Hz −13%, better
Qts0.29 −6%
Vas19 L +73%, worse
BL7.5 T·m +9%
Xmax6 mm +9%
Sensitivity87 dB +0.9
MorelTICW 638ND
£293.02 · 24% more, worseFs45 Hz –
Qts0.42 +35%, worse
Vas14 L +27%, worse
BL7.5 T·m +10%
Xmax5.3 mm −5%
Sensitivity86.4 dB –
MorelTSCW 636
£431.21 · 83% more, worseFs43 Hz −4%
Qts0.36 +16%, worse
Vas13.3 L +21%, worse
BL7.9 T·m +16%, better
Xmax5 mm −9%
Sensitivity86.4 dB –
MorelSCW 636
£452.11 · 91% more, worseFs40 Hz −11%, better
Qts0.29 −6%
Vas18.5 L +68%, worse
BL7.2 T·m +5%
Xmax5 mm −9%
Sensitivity87.3 dB +1.2
E J JordanEIKONA
No current priceFs43 Hz −4%
Qts0.35 +15%, worse
Vas11.0 L –
BL6.5 T·m −4%
Xmax5 mm −9%
Sensitivity85.3 dB −0.8
Tang BandW3-2052S
No current priceFs50 Hz +11%, worse
Qts0.34 +10%
Vas0.9 L −92%, better
BL6.8 T·m –
Xmax5 mm −9%
Sensitivity76.7 dB −9.4, worse
Tang BandW4-1798S
No current priceFs60 Hz +33%, worse
Qts0.30 −3%
Vas7.4 L −33%, better
BL5.8 T·m −16%, worse
Xmax3 mm −45%, worse
Sensitivity88.4 dB +2.3, better
PurifiPTT4.0M08-NFC-01
No current priceFs48 Hz +7%
Qts0.31 –
Vas5.3 L −52%, better
BL7 T·m –
Xmax2.9 mm −47%, worse
Sensitivity84.5 dB −1.6
CIAREHWL100
No current priceFs70 Hz +56%, worse
Qts0.31 –
Vas4.3 L −61%, better
BL5.6 T·m −18%, worse
Xmax4.3 mm −22%, worse
Sensitivity88 dB +1.9
Audio Technology4 H 52 06 13 SD
No current priceFs48 Hz +7%
Qts0.33 +6%
Vas16 L +45%, worse
BL6.1 T·m −11%, worse
Xmax3.5 mm −36%, worse
Sensitivity88.4 dB +2.3, better
PurifiPTT4.0X04-NAC-03
No current priceFs40 Hz −11%, better
Qts0.31 –
Vas5.5 L −50%, better
BL6.1 T·m −11%, worse
Xmax8.8 mm +60%, better
Sensitivity82.2 dB −3.9, worse
Tang BandW4-1749S
No current priceFs60 Hz +33%, worse
Qts0.34 +10%
Vas6.3 L −42%, better
BL5.8 T·m −15%, worse
Xmax0.9 mm −84%, worse
Sensitivity87.5 dB +1.4
Tang BandW4-992SD
No current priceFs55 Hz +22%, worse
Qts0.35 +13%, worse
Vas5.7 L −48%, better
BL6.4 T·m −6%
Xmax3.5 mm −36%, worse
Sensitivity85.8 dB –
MorelEM 428D
No current priceFs69 Hz +53%, worse
Qts0.33 +6%
Vas4.1 L −63%, better
BL6.0 T·m −13%, worse
Xmax4 mm −27%, worse
Sensitivity87.4 dB +1.3
Tang BandW3-1750SB
No current priceFs50 Hz +11%, worse
Qts0.37 +19%, worse
Vas1.7 L −85%, better
BL8.0 T·m +17%, better
Xmax5 mm −9%
Sensitivity79.3 dB −6.8, worse
Tang BandW3-1401SD
No current priceFs75 Hz +67%, worse
Qts0.31 –
Vas1.6 L −85%, better
BL5.6 T·m −19%, worse
Xmax3.5 mm −36%, worse
Sensitivity84.7 dB −1.4
MarkaudioALPAIR 10.3
No current priceFs38 Hz −15%, better
Qts0.32 –
Vas26.3 L +139%, worse
BL5.8 T·m −15%, worse
Xmax7.5 mm +36%, better
Sensitivity87.9 dB +1.8
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.0 out of 51 rating · 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 |
|---|---|---|---|---|
Falcon Acoustics | £270.00, the lowest price | In stock | Visit shop at Falcon Acoustics | |
Willys-Hifi | £280.42 | 3.9% above the lowest price | Stock not listed | Visit shop at Willys-Hifi |
Wilmslow Audio | £294.00 | 8.9% above the lowest price | Stock not listed | Visit shop at Wilmslow Audio |
Lautsprechershop Import VAT and duty may apply | £236.12 | Stock not listed | Visit shop at Lautsprechershop | |
SoundImports Import VAT and duty may apply | £267.90 | 2 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£287.95 → £280.42Down 2.6% from £287.95
- 30 SepWillys-Hifi£286.95 → £287.95Up 0.3% from £286.95
- 28 SepWillys-Hifi£285.95 → £286.95Up 0.3% from £285.95