B&C 18SW115

18" · 8 Ω · 1700 W · 97 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	32 Hz
Qts	0.3
Qes	0.32
Qms	5.6
Vas	187 L
Sd	1210 cm²
Xmax	14 mm
Re	5.3 Ω
Bl	30.3 T·m
Mms	275 g
Pe	1700 W
Sensitivity	97 dB

Alignment hint

EBP	100 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 41 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 18LW2600	31 -1	0.29 -0.01	187 =	14.8 +0.8	96.8 -0.2	close		+
Oberton 18NXB1600	32.37 +0.37	0.303 =	173.11 -13.89	13.5 -0.5	97 =	close	Xmax 13.5 mm < 14 mm: lower excursion-limited SPL	+
18 Sound 18LW2600	30 -2	0.28 -0.02	186 -1	14 =	96.5 -0.5	close	4 Ω vs 8 Ω: amp load changes	+
18 Sound 18NLW9000	34 +2	0.31 +0.01	206 +19	14 =	97 =	close		+
Faital PRO 18XL1600	32 =	0.31 +0.01	201.1 +14.1	12.92 -1.08	98 +1	close	4 Ω vs 8 Ω: amp load changes · Xmax 12.92 mm < 14 mm: lower excursion-limited SPL	+
RCF LF18N408	30 -2	0.33 +0.03	193 +6	15 +1	97 =	close		+
Faital PRO 18HW1070	32 =	0.33 +0.03	191.5 +4.5	13 -1	96 -1	close	4 Ω vs 8 Ω: amp load changes · Xmax 13 mm < 14 mm: lower excursion-limited SPL	+
18 Sound 18NTLW5000	32 =	0.3 =	165 -22	17.5 +3.5	95 -2	close	4 Ω vs 8 Ω: amp load changes	+
B&C 18 SW 115	32 =	0.303 =	187 =	9.8 -4.2	96.6 -0.4	close	Xmax 9.8 mm < 14 mm: lower excursion-limited SPL	+
18 Sound 18NLW4100	31 -1	0.34 +0.04	180 -7	15 +1	96.5 -0.5	close		+

Compare the closest 3 against the 18SW115 →

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 (2)

18" Scoop Hornsubscoop
2×18" Bass Reflexsubbass reflex