18 Sound 21LW2600

21" · 8 Ω · 1600 W · 97 dB · datasheet ↗

Thiele-Small parameters

Nominal size	21"
Impedance	8 Ω
Fs	27 Hz
Qts	0.33
Qes	0.34
Qms	23.1
Vas	333 L
Sd	1660 cm²
Xmax	14.6 mm
Re	5.2 Ω
Bl	32.5 T·m
Mms	398 g
Pe	1600 W
Sensitivity	97 dB

Alignment hint

EBP	79 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 92.7 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 21NTLW5000	30 +3	0.32 -0.01	300 -33	17.5 +2.9	97 =	close	4 Ω vs 8 Ω: amp load changes	+
18 Sound 21NLW5300	31 +4	0.32 -0.01	325 -8	15.3 +0.7	98.5 +1.5	close		+
B&C 21SW115	30 +3	0.37 +0.04	318 -15	14 -0.6	97 =	close	Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
RCF LF21X451	28 +1	0.37 +0.04	385 +52	14 -0.6	97 =	close	Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
Beyma 21"LEX1600/Nd	30 +3	0.29 -0.04	305 -28	14 -0.6	98 +1	close	Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
18 Sound 21NTLW5000	31 +4	0.36 +0.03	270 -63	17.5 +2.9	97 =	usable		+
18 Sound 21NLW9001	31 +4	0.34 +0.01	272 -61	14 -0.6	95 -2	usable	4 Ω vs 8 Ω: amp load changes · Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
B&C 21SW115	33 +6	0.36 +0.03	278 -55	14 -0.6	97 =	usable	4 Ω vs 8 Ω: amp load changes · Xmax 14 mm < 14.6 mm: lower excursion-limited SPL	+
Beyma 21QLEX1600Fe	30 +3	0.28 -0.05	309 -24	13 -1.6	98 +1	usable	Xmax 13 mm < 14.6 mm: lower excursion-limited SPL	+
Eminence NSW6021-6	29 +2	0.31 -0.02	224.58 -108.42	21 +6.4	97 =	usable	6 Ω vs 8 Ω: amp load changes	+

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.