CIAREHWB200
£72.01 · 89% less, betterFs32 Hz −16%, better
Qts0.38 +36%, worse
Vas57 L +6%
BL7.3 T·m −11%, worse
Xmax7 mm –
Sensitivity88.8 dB −3.2, worse
8-inch LF driver · Ellipticor series · 50 W
Scanspeak 21WE/4542T00 4Ω
4 Ω
£1,038.64
2.4%Willys-Hifi · All 4 offers
- Fs
- 38Hz
- Xmax
- 7.2mm
- SPL
- 92dB
- Pe
- 50W
- BL
- 8.2T·m
- Vd
- 168cm³
- Qts
- 0.28
- Vas
- 54L
Scanspeak 21WE/4542T00 is an 8-inch 4 ohm LF driver rated at 50 W RMS. The validated T/S data includes Fs 38 Hz, Qts 0.28, Vas 54 L, Xmax 7.2 mm, sensitivity 92 dB, plus 168 cm³ Vd and 127 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 £669.81.
The published T/S values agree with each other
Thiele/Small
- Fs
- 38Hz
- Qts
- 0.28
- Qes
- 0.30
- Qms
- 5.4
- Vas
- 54L
- Re
- 3.4Ω
- Le
- 0.10mH
Motor and cone
- BL
- 8.2T·m
- Sd
- 233cm²
- Mms
- 25g
- Xmax
- 7.2mm
- Vd †
- 168cm³
Power and response
- Sensitivity †
- 92dB
- Manufacturer sensitivity
- 93.5dB
- Power
- 50W
- Impedance
- 4Ω
- Min. impedance
- 4.4Ω
- EBP †
- 127 · Leans vented
Size and mounting
- Diameter
- 210mm
Other published values
- Cms
- 0.70mm/N
- Rms
- 1.10kg/s
- Xmech
- 12
- Power Peak
- 100
Sensitivity shows 92.0 dB, calculated from the T/S values. Scanspeak publishes 93.5 dB, 1.5 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Scanspeak lists
LF · Primary · 8″
- BL
- 8.2T·m
- Fs
- 38Hz
- Le
- 0.10mH
- Re
- 3.4Ω
- Sd
- 233cm²
- Cms
- 0.70mm/N
- Mms
- 25g
- Qes
- 0.30
- Qms
- 5.4
- Qts
- 0.28
- Rms
- 1.10kg/s
- SPL
- 92dB
- Vas
- 54L
- Xmax
- 7.2mm
- Xmech
- 12
- Power
- 50W
- Impedance
- 4Ω
- Power Peak
- 100
- Sensitivity
- 93.5dB
- Calculated sensitivity †
- 92dB
- Manufacturer sensitivity
- 93.5dB
- Min. impedance
- 4.4Ω
- Diameter
- 210mm
02
Compare
Same-size drivers, compared with the 21WE/4542T00. Clear differences are green when better and red when worse.
This driver21WE/4542T00
Best price
£669.81
Fs
38 Hz
Qts
0.28
Vas
54 L
BL
8.2 T·m
Xmax
7.2 mm
Sensitivity
92 dB
Power
50 W
SB AcousticsSB23NRXS45-4
£84.41 · 87% less, betterFs27 Hz −29%, better
Qts0.30 +7%
Vas87.5 L +62%, worse
BL6.9 T·m −16%, worse
Xmax6.5 mm −10%
Sensitivity89.3 dB −2.7, worse
ETON7-612/C8/32 RP
£96.25 · 86% less, betterFs37 Hz –
Qts0.30 +7%
Vas28 L −48%, better
BL8.6 T·m +5%
Xmax4.5 mm −38%, worse
Sensitivity88.5 dB −3.5, worse
FaitalPRO8RS350
£111.65 · 83% less, betterFs42 Hz +11%, worse
Qts0.30 +7%
Vas23.7 L −56%, better
BL13.9 T·m +70%, better
Xmax7.4 mm –
Sensitivity89.6 dB −2.4, worse
Scanspeak18W/8545K00
£144.00 · 79% less, betterFs28 Hz −26%, better
Qts0.28 –
Vas46.4 L −14%, better
BL8.2 T·m –
Xmax6.5 mm −10%
Sensitivity87.3 dB −4.7, worse
SB AcousticsMW19P-4
£165.40 · 75% less, betterFs29 Hz −24%, better
Qts0.24 −14%, better
Vas61 L +13%, worse
BL6.5 T·m −21%, worse
Xmax6.8 mm −6%
Sensitivity89.6 dB −2.4, worse
SB AcousticsMW19P-8
£167.42 · 75% less, betterFs30 Hz −22%, better
Qts0.29 +4%
Vas61 L +13%, worse
BL7.7 T·m −6%
Xmax6.7 mm −7%
Sensitivity88.9 dB −3.1, worse
SB AcousticsMW19PNW-4
£168.40 · 75% less, betterFs29 Hz −24%, better
Qts0.24 −14%, better
Vas61 L +13%, worse
BL6.5 T·m −21%, worse
Xmax6.8 mm −6%
Sensitivity89.6 dB −2.4, worse
SB AcousticsMW19PNW-8
£170.81 · 74% less, betterFs30 Hz −22%, better
Qts0.29 +4%
Vas61 L +13%, worse
BL7.7 T·m −6%
Xmax6.7 mm −7%
Sensitivity88.9 dB −3.1, worse
SEASH1471-08 CA22RNY
£171.54 · 74% less, betterFs34 Hz −11%, better
Qts0.30 +7%
Vas82 L +52%, worse
BL8.5 T·m +4%
Xmax6 mm −17%, worse
Sensitivity91.5 dB −0.5
WavecorWF182BD08
£190.66 · 72% less, betterFs33 Hz −12%, better
Qts0.29 +4%
Vas32.4 L −40%, better
BL8.5 T·m +4%
Xmax5.5 mm −24%, worse
Sensitivity88.1 dB −3.9, worse
WavecorWF182BD03
£190.66 · 72% less, betterFs39 Hz –
Qts0.29 +4%
Vas24.4 L −55%, better
BL6.8 T·m −18%, worse
Xmax5.5 mm −24%, worse
Sensitivity88.9 dB −3.1, worse
WavecorWF182BD16
£191.74 · 71% less, betterFs37 Hz –
Qts0.30 +7%
Vas23 L −57%, better
BL8.5 T·m +4%
Xmax5.5 mm −24%, worse
Sensitivity87.8 dB −4.2, worse
Scanspeak21W/8555-10
£217.66 · 68% less, betterFs20 Hz −47%, better
Qts0.31 +11%, worse
Vas134 L +148%, worse
BL8.2 T·m –
Xmax6.5 mm −10%
Sensitivity87.1 dB −4.9, worse
SB AcousticsMT19CP-8
£234.41 · 65% less, betterFs43 Hz +13%, worse
Qts0.31 +11%, worse
Vas37.1 L −31%, better
BL8.1 T·m –
Xmax3.6 mm −50%, worse
Sensitivity91.5 dB −0.5
SB AcousticsMW19TX-4
£283.85 · 58% less, betterFs32 Hz −16%, better
Qts0.27 −4%
Vas53.2 L –
BL6.3 T·m −23%, worse
Xmax6.8 mm −6%
Sensitivity90 dB −2, worse
SB AcousticsMW19TX-8
£283.85 · 58% less, betterFs33 Hz −13%, better
Qts0.33 +18%, worse
Vas53.4 L –
BL7.5 T·m −9%
Xmax6.7 mm −7%
Sensitivity89.4 dB −2.6, worse
£309.76 · 54% less, better
Fs33 Hz −13%, better
Qts0.30 +7%
Vas72 L +33%, worse
BL8.8 T·m +7%
Xmax7 mm –
Sensitivity90.6 dB −1.4
£410.34 · 39% less, better
Fs21 Hz −45%, better
Qts0.29 +4%
Vas164 L +204%, worse
BL8 T·m –
Xmax7 mm –
Sensitivity88.9 dB −3.1, worse
CIAREHWB205
No current priceFs28 Hz −26%, better
Qts0.29 +4%
Vas79 L +46%, worse
BL9.3 T·m +13%, better
Xmax7 mm –
Sensitivity89.6 dB −2.4, worse
HiViSS8IIR
No current priceFs33 Hz −13%, better
Qts0.28 –
Vas59.6 L +10%, worse
BL9.2 T·m +12%, better
Xmax4.8 mm −33%, worse
Sensitivity90.7 dB −1.3
SB AcousticsMW19PF-4
No current priceFs29 Hz −24%, better
Qts0.27 −4%
Vas62.7 L +16%, worse
BL6.1 T·m −26%, worse
Xmax6.5 mm −10%
Sensitivity89.4 dB −2.6, worse
Audio Technology8 I 52 20 06 SD
No current priceFs33 Hz −13%, better
Qts0.26 −7%
Vas70 L +30%, worse
BL10.0 T·m +21%, better
Xmax8 mm +11%, better
Sensitivity91.3 dB −0.7
Audio Technology18 H 52 17 06 SD
No current priceFs36 Hz −5%
Qts0.28 –
Vas34 L −37%, better
BL6.6 T·m −20%, worse
Xmax6.3 mm −13%, worse
Sensitivity88.8 dB −3.2, worse
Audio Technology8 A 77 20 06 SD
No current priceFs30 Hz −21%, better
Qts0.30 +7%
Vas67 L +24%, worse
BL9.3 T·m +13%, better
Xmax8 mm +11%, better
Sensitivity89.2 dB −2.8, worse
HiViSS8II
No current priceFs32 Hz −16%, better
Qts0.32 +14%, worse
Vas61.6 L +14%, worse
BL8.5 T·m +4%
Xmax5.8 mm −19%, worse
Sensitivity89.8 dB −2.2, worse
Tang BandW8-2096B
No current priceFs32 Hz −16%, better
Qts0.32 +14%, worse
Vas57.9 L +7%
BL8.0 T·m −3%
Xmax8.5 mm +18%, better
Sensitivity89.1 dB −2.9, worse
Audio Technology18 H 52 06 13 SDKA-LR
No current priceFs32 Hz −16%, better
Qts0.25 −11%, better
Vas50 L −7%
BL7.4 T·m −10%
Xmax4 mm −44%, worse
Sensitivity89.9 dB −2.1, worse
No photo
PHL Audio2730
No current priceFs42 Hz +11%, worse
Qts0.26 −7%
Vas34.1 L −37%, better
BL12.6 T·m +54%, better
Xmax7 mm –
Sensitivity91.7 dB –
LavoceCAN082.00K
No current priceFs72 Hz +89%, worse
Qts0.27 −4%
Vas15.1 L −72%, better
BL13.2 T·m +60%, better
Xmax6.7 mm −7%
Sensitivity94.8 dB +2.8, better
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 52 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 |
|---|---|---|---|---|
Willys-Hifi | £1,038.64, the lowest price | Stock not listed | Visit shop at Willys-Hifi | |
SoundImports Import VAT and duty may apply | £669.81 | 2 in stock | Visit shop at SoundImports | |
Lautsprechershop Import VAT and duty may apply | £862.85 | Special order | Visit shop at Lautsprechershop |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£1,063.95 → £1,038.64Down 2.4% from £1,063.95
- 30 SepWillys-Hifi£1,059.95 → £1,063.95Up 0.4% from £1,059.95
- 29 SepWillys-Hifi£1,061.95 → £1,059.95Down 0.2% from £1,061.95