18 Sound 21LW2600

21" · 4 Ω · 1600 W · 97 dB · datasheet ↗

Thiele-Small parameters

Nominal size	21"
Impedance	4 Ω
Fs	27 Hz
Qts	0.37
Qes	0.39
Qms	6.9
Vas	190 L
Sd	1660 cm²
Xmax	14.6 mm
Re	2.5 Ω
Bl	24.5 T·m
Mms	420 g
Pe	1600 W
Sensitivity	97 dB

Alignment hint

EBP	69 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 71.6 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
B&C 21SW152	32 +5	0.36 -0.01	200 +10	15 +0.4	96 -1	close	8 Ω vs 4 Ω: amp load changes	+
RCF LF21N551	35 +8	0.33 -0.04	200 +10	15 +0.4	97 =	usable	8 Ω vs 4 Ω: amp load changes	+
18 Sound 21NLW4100	34 +7	0.4 +0.03	219 +29	15.2 +0.6	97 =	usable		+
Eminence NSW6021-6	29 +2	0.31 -0.06	224.58 +34.58	21 +6.4	97 =	usable	6 Ω vs 4 Ω: amp load changes	+
18 Sound 21NTLW5000	31 +4	0.36 -0.01	270 +80	17.5 +2.9	97 =	usable	8 Ω vs 4 Ω: amp load changes	+
Fane Colossus Prime 21NDXL	33 +6	0.36 -0.01	241 +51	14 -0.6	98 +1	usable	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
Lavoce SAN215.30	35 +8	0.33 -0.04	200 +10	14.9 +0.3	95.7 -1.3	usable	8 Ω vs 4 Ω: amp load changes	+
B&C 21SW152	32 +5	0.3 -0.07	200 +10	15 +0.4	96 -1	usable		+
B&C 21SW115	30 +3	0.37 =	318 +128	14 -0.6	97 =	usable	8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
B&C 21SW115	33 +6	0.36 -0.01	278 +88	14 -0.6	97 =	usable	Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 21LW2600 →

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.