RCF 21LNW9000

21.5" · 8 Ω · 1800 W · 96.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	21.5"
Impedance	8 Ω
Fs	29 Hz
Qts	0.347
Qes	0.36
Qms	9.32
Vas	304 L
Sd	1662 cm²
Xmax	10.7 mm
Re	6 Ω
Bl	34.1 T·m
Mms	383.6 g
Pe	1800 W
Sensitivity	96.4 dB

Alignment hint

EBP	81 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 96.4 L

EBP 50-100: works in either a sealed or ported alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
18 Sound 21NLW9000	29 =	0.347 =	304 =	10.7 =	96.4 =	close		+
LaVoce SAF214.50 vp	30 +1	0.401 +0.05	311 +7	11.6 +0.9	96.4 =	close		+
RCF LF 21X451	28 -1	0.369 +0.02	385 +81	13 +2.3	97 +0.6	close		+
Ciare NDC 21-5	32.2 +3.2	0.344 =	270.8 -33.2	8.8 -1.9	97.2 +0.8	close	Xmax 8.8 mm < 10.7 mm: lower excursion-limited SPL	+
RCF LF 21N401	30 +1	0.378 +0.03	374 +70	10.6 -0.1	98 +1.6	close	Xmax 10.6 mm < 10.7 mm: lower excursion-limited SPL	+
Beyma 21PW1400FE	30 +1	0.343 =	401.5 +97.5	10 -0.7	98.6 +2.2	close	1400 W vs 1800 W: lower power handling · Xmax 10 mm < 10.7 mm: lower excursion-limited SPL	+
SB Audience NERO-21SW1100D	32 +3	0.339 -0.01	312.6 +8.6	8.1 -2.6	98.6 +2.2	usable	1100 W vs 1800 W: lower power handling · Xmax 8.1 mm < 10.7 mm: lower excursion-limited SPL	+
MC Kenzie FRL-21/1200-LF	30 +1	0.378 +0.03	374 +70	9.5 -1.2	98 +1.6	usable	1200 W vs 1800 W: lower power handling · Xmax 9.5 mm < 10.7 mm: lower excursion-limited SPL	+
LaVoce SAF214.50	30 +1	0.435 +0.09	267 -37	11.6 +0.9	95.6 -0.8	usable		+
Eminence NSW6021-6	29 =	0.304 -0.04	224.6 -79.4	10.3 -0.4	97.7 +1.3	usable	4 Ω vs 8 Ω: amp load changes · Xmax 10.3 mm < 10.7 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 21LNW9000 →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.