B&C 18DS115

18" · 4 Ω · 1700 W · 97 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	4 Ω
Fs	30 Hz
Qts	0.17
Qes	0.18
Qms	4.75
Vas	177 L
Sd	1210 cm²
Xmax	16.5 mm
Re	3.3 Ω
Bl	34 T·m
Mms	348 g
Pe	1700 W
Sensitivity	97 dB

Alignment hint

EBP	167 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 10.9 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 18DS115	30 =	0.2 +0.03	168 -9	16.5 =	98 +1	close	8 Ω vs 4 Ω: amp load changes	+
18 Sound 18iD200	29 -1	0.17 =	136 -41	18 +1.5	95 -2	close	2 Ω vs 4 Ω: amp load changes	+
18 Sound 18iDSDS	29 -1	0.17 =	136 -41	18 +1.5	95 -2	close	2 Ω vs 4 Ω: amp load changes	+
B&C 18IPAL	32 +2	0.14 -0.03	164 -13	20 +3.5	97 =	close	2 Ω vs 4 Ω: amp load changes	+
Beyma 18QLEX1600Fe	30 =	0.23 +0.06	195 +18	13 -3.5	97 =	usable	8 Ω vs 4 Ω: amp load changes · Xmax 13 mm < 16.5 mm: lower excursion-limited SPL	+
Precision Devices PD1850	30 =	0.21 +0.04	249 +72	16 -0.5	98 +1	usable	8 Ω vs 4 Ω: amp load changes · 800 W vs 1700 W: lower power handling · Xmax 16 mm < 16.5 mm: lower excursion-limited SPL	+
18 Sound 18NLW9000	32 +2	0.21 +0.04	247 +70	14 -2.5	97 =	usable	Xmax 14 mm < 16.5 mm: lower excursion-limited SPL	+
Beyma 18QLEX1600Fe	31 +1	0.25 +0.08	177.2 +0.2	13 -3.5	96 -1	usable	Xmax 13 mm < 16.5 mm: lower excursion-limited SPL	+
B&C 18DS100	32 +2	0.24 +0.07	157 -20	14 -2.5	98 +1	usable	Xmax 14 mm < 16.5 mm: lower excursion-limited SPL	+
B&C 18 DS 115	30 =	0.2 +0.03	168 -9	7.5 -9	97.4 +0.4	usable	8 Ω vs 4 Ω: amp load changes · Xmax 7.5 mm < 16.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 18DS115 →

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.