B&C 21DS115

21" · 4 Ω · 1700 W · 100 dB · datasheet ↗

Thiele-Small parameters

Nominal size	21"
Impedance	4 Ω
Fs	32 Hz
Qts	0.21
Qes	0.22
Qms	9.8
Vas	219 L
Sd	1620 cm²
Xmax	15 mm
Re	2.1 Ω
Bl	28.6 T·m
Mms	409 g
Pe	1700 W
Sensitivity	100 dB

Alignment hint

EBP	145 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 21.2 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
Faital PRO 21XL3000	32 =	0.22 +0.01	223.5 +4.5	17.67 +2.67	98 -2	close		+
B&C 21DS115	34 +2	0.27 +0.06	204 -15	16.5 +1.5	99 -1	usable	8 Ω vs 4 Ω: amp load changes	+
B&C 21IPAL	37 +5	0.21 =	155 -64	22 +7	99 -1	usable	1 Ω vs 4 Ω: amp load changes	+
Faital PRO 21XL3000	30 -2	0.25 +0.04	284.6 +65.6	17.67 +2.67	98 -2	usable	8 Ω vs 4 Ω: amp load changes	+
B&C 21SW152	32 =	0.3 +0.09	200 -19	15 =	96 -4	usable		+
18 Sound 21NLW9001	32 =	0.31 +0.1	244 +25	14 -1	98 -2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15 mm: lower excursion-limited SPL	+
Eminence NSW6021-6	29 -3	0.31 +0.1	224.58 +5.58	21 +6	97 -3	usable	6 Ω vs 4 Ω: amp load changes	+
RCF LF21N551	35 +3	0.33 +0.12	200 -19	15 =	97 -3	usable	8 Ω vs 4 Ω: amp load changes	+
18 Sound 21NLW9601	37 +5	0.29 +0.08	175 -44	14 -1	98 -2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15 mm: lower excursion-limited SPL	+
Beyma 21"LEX1600/Nd	30 -2	0.29 +0.08	305 +86	14 -1	98 -2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 21DS115 →

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.