JBL E155-4

18" · 4 Ω · 300 W · 104.2 dB

Thiele-Small parameters

Nominal size	18"
Impedance	4 Ω
Fs	30 Hz
Qts	0.2
Qes	0.22
Qms	2.2
Vas	424.8 L
Sd	1140 cm²
Xmax	5.1 mm
Re	2.5 Ω
Bl	16.1 T·m
Mms	120.7 g
Pe	300 W
Sensitivity	104.2 dB

Alignment hint

EBP	136 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 36.9 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
JBL E155-8	30 =	0.2 =	424.8 =	5.1 =	100.4 -3.8	close	8 Ω vs 4 Ω: amp load changes	+
JBL 2240G	30 =	0.227 +0.03	481.4 +56.6	5.2 +0.1	104.2 =	close		+
JBL 2240H	30 =	0.224 +0.02	481.4 +56.6	5.1 =	100.4 -3.8	close	8 Ω vs 4 Ω: amp load changes	+
RCF L 18P751	30 =	0.238 +0.04	400 -24.8	5 -0.1	100.3 -3.9	usable	8 Ω vs 4 Ω: amp load changes · Xmax 5 mm < 5.1 mm: lower excursion-limited SPL	+
AE Speakers TD18H+	29 -1	0.221 +0.02	390 -34.8	7 +1.9	99.7 -4.5	usable	8 Ω vs 4 Ω: amp load changes	+
JBL 2243H	30 =	0.192 -0.01	338.1 -86.7	4.3 -0.8	100.4 -3.8	usable	8 Ω vs 4 Ω: amp load changes · Xmax 4.3 mm < 5.1 mm: lower excursion-limited SPL	+
AE Speakers TD18H+ 8 Ohms	29 -1	0.221 +0.02	390 -34.8	7 +1.9	99 -5.2	usable	8 Ω vs 4 Ω: amp load changes	+
JBL 2240H/G	30 =	0.23 +0.03	480 +55.2	5.5 +0.4	99 -5.2	usable	8 Ω vs 4 Ω: amp load changes	+
McCauley B1840	28 -2	0.231 +0.03	405 -19.8	4.8 -0.3	99.1 -5.1	usable	8 Ω vs 4 Ω: amp load changes · Xmax 4.8 mm < 5.1 mm: lower excursion-limited SPL	+
PD PD 184C01	30 =	0.227 +0.03	337.1 -87.7	7.8 +2.7	100.2 -4	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the E155-4 →

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.