B&C 21 SW 152

21.5" · 4 Ω · 2000 W · 98.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	21.5"
Impedance	4 Ω
Fs	32 Hz
Qts	0.297
Qes	0.31
Qms	7
Vas	198.2 L
Sd	1680 cm²
Xmax	7.5 mm
Re	3.4 Ω
Bl	33 T·m
Mms	493.7 g
Pe	2000 W
Sensitivity	98.9 dB

Alignment hint

EBP	103 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 42.5 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 21 SW 152 v2013	32 =	0.297 =	200 +1.8	7.5 =	99.5 +0.6	close		+
RCF LF 21N551	35 +3	0.331 +0.03	200 +1.8	7.7 +0.2	97.7 -1.2	close	8 Ω vs 4 Ω: amp load changes	+
Eminence NSW6021-6	29 -3	0.304 +0.01	224.6 +26.4	10.3 +2.8	97.7 -1.2	close		+
Dayton Audio PSS545HE-4 VORTEX	28.8 -3.2	0.27 -0.03	212.1 +13.9	8.6 +1.1	97.8 -1.1	close		+
Ciare NDK 21-4	28.5 -3.5	0.322 +0.03	232.4 +34.2	8 +0.5	97.4 -1.5	usable	1500 W vs 2000 W: lower power handling	+
B&C 21 SW 150	29 -3	0.261 -0.04	254 +55.8	7.5 =	99.4 +0.5	usable	1500 W vs 2000 W: lower power handling	+
PD PDN 2151	31.4 -0.6	0.276 -0.02	303.4 +105.2	6.7 -0.8	99 +0.1	usable	8 Ω vs 4 Ω: amp load changes · 1000 W vs 2000 W: lower power handling · Xmax 6.7 mm < 7.5 mm: lower excursion-limited SPL	+
Precision Devices PDN 2151	31.4 -0.6	0.276 -0.02	303.4 +105.2	6.7 -0.8	99 +0.1	usable	8 Ω vs 4 Ω: amp load changes · 1000 W vs 2000 W: lower power handling · Xmax 6.7 mm < 7.5 mm: lower excursion-limited SPL	+
Dayton Audio HTS545HE-4 KRAKEN	26.3 -5.7	0.28 -0.02	179 -19.2	8.8 +1.3	95.7 -3.2	usable		+
Ciare NDC 21-5	32.2 +0.2	0.344 +0.05	270.8 +72.6	8.8 +1.3	97.2 -1.7	usable	8 Ω vs 4 Ω: amp load changes · 1500 W vs 2000 W: lower power handling	+

Compare the closest 3 against the 21 SW 152 →

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.