Media
Size
21"
Impedance
4Ω
RMS Power
1800W
EBP
123
Vented alignment
Vd
2327cm³
T/S Parameters
Valid
Fs38Hz
Qts0.29
Qes0.31
Qms6.3
Vas140.0L
Re2.9Ω
Le1.61mH
BL33.2Tm
Sd1662cm²
Mms460g
Xmax14.0mm
Power1800W
Impedance4Ω
F Low33Hz
F High2000Hz
Pricing & availability
Price movement
Other offers
1 vendorleanbusiness
Updated 17 May 2026· 4Ω
Source: inc VAT · 20%
£798.74
inc VAT
Best current price
Updated 17 May 2026
leanbusiness
£699.33
Avg £749.04£49.71 below avg (-6.6%)
inc VAT
Dimensions & Physical
Weight13.6kg
Diameter545.0mm
Overall Depth250.0mm
Cutout Diameter492.0mm
Bolt Circle Diameter520.0mm
Similar Drivers
Keep size fixed, then add or remove T/S params to change the ranking and the comparison rows.
Reference
Eighteen Sound
21NLW9601C
21"
Best current price
£699.33
Compare on
Only active params are shown here. Size stays fixed automatically.
5 active T/S params, plus size.
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