18 Sound 18LW1250

18" · 8 Ω · 1000 W · 100.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	35 Hz
Qts	0.271
Qes	0.28
Qms	8
Vas	268 L
Sd	1134 cm²
Xmax	8.7 mm
Re	5 Ω
Bl	23.4 T·m
Mms	139.1 g
Pe	1000 W
Sensitivity	100.2 dB

Alignment hint

EBP	125 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 46.1 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
18 Sound 18LW1251	35 =	0.27 =	268 =	9 +0.3	98 -2.2	close		+
RCF LF 18G401	33 -2	0.289 +0.02	268 =	8.2 -0.5	99.3 -0.9	close	Xmax 8.2 mm < 8.7 mm: lower excursion-limited SPL	+
PHL Audio 7010	35 =	0.288 +0.02	260 -8	7.7 -1	99.1 -1.1	close	Xmax 7.7 mm < 8.7 mm: lower excursion-limited SPL	+
PHL Audio 7070	35 =	0.288 +0.02	260 -8	7.7 -1	99.1 -1.1	close	Xmax 7.7 mm < 8.7 mm: lower excursion-limited SPL	+
18 Sound 18NLW9400	33 -2	0.26 -0.01	268 =	9.5 +0.8	98 -2.2	close		+
RCF LF 18N401	32 -3	0.259 -0.01	257 -11	8.8 +0.1	98.9 -1.3	close		+
RCF LF18G401	33 -2	0.29 +0.02	268 =	9 +0.3	98 -2.2	close		+
RCF LF18G908	33 -2	0.29 +0.02	268 =	9 +0.3	98 -2.2	close		+
B&C 18 TBX 46	31 -4	0.277 +0.01	270 +2	9 +0.3	98.2 -2	close		+
B&C 18 PZB 100 (prodance)	33.7 -1.3	0.289 +0.02	263 -5	7.6 -1.1	99 -1.2	close	700 W vs 1000 W: lower power handling · Xmax 7.6 mm < 8.7 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 18LW1250 →

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.