B&C 21SW152

21" · 4 Ω · 2000 W · 96 dB · datasheet ↗

Thiele-Small parameters

Nominal size	21"
Impedance	4 Ω
Fs	32 Hz
Qts	0.3
Qes	0.31
Qms	7
Vas	200 L
Sd	1680 cm²
Xmax	15 mm
Re	3.3 Ω
Bl	32.5 T·m
Mms	460 g
Pe	2000 W
Sensitivity	96 dB

Alignment hint

EBP	103 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 43.9 L

EBP > 100: favours a ported (bass-reflex) 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
B&C 21SW152	32 =	0.36 +0.06	200 =	15 =	96 =	close	8 Ω vs 4 Ω: amp load changes	+
Lavoce SAN215.30	35 +3	0.33 +0.03	200 =	14.9 -0.1	95.7 -0.3	close	8 Ω vs 4 Ω: amp load changes · Xmax 14.9 mm < 15 mm: lower excursion-limited SPL	+
RCF LF21N551	35 +3	0.33 +0.03	200 =	15 =	97 +1	close	8 Ω vs 4 Ω: amp load changes	+
Eminence NSW6021-6	29 -3	0.31 +0.01	224.58 +24.58	21 +6	97 +1	close	6 Ω vs 4 Ω: amp load changes	+
18 Sound 21NLW9001	32 =	0.31 +0.01	244 +44	14 -1	98 +2	close	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15 mm: lower excursion-limited SPL	+
B&C 21DS115	34 +2	0.27 -0.03	204 +4	16.5 +1.5	99 +3	close	8 Ω vs 4 Ω: amp load changes	+
18 Sound 21NLW9601	37 +5	0.29 -0.01	175 -25	14 -1	98 +2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15 mm: lower excursion-limited SPL	+
18 Sound 21NLW9001	31 -1	0.34 +0.04	272 +72	14 -1	95 -1	usable	Xmax 14 mm < 15 mm: lower excursion-limited SPL	+
18 Sound 21LW2600	27 -5	0.37 +0.07	190 -10	14.6 -0.4	97 +1	usable	Xmax 14.6 mm < 15 mm: lower excursion-limited SPL	+
18 Sound 21NLW4100	34 +2	0.4 +0.1	219 +19	15.2 +0.2	97 +1	usable	1500 W vs 2000 W: lower power handling	+

Compare the closest 3 against the 21SW152 →

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.