JBL 2240G

18" · 4 Ω · 300 W · 104.2 dB

Thiele-Small parameters

Nominal size	18"
Impedance	4 Ω
Fs	30 Hz
Qts	0.227
Qes	0.25
Qms	2.5
Vas	481.4 L
Sd	1297.4 cm²
Xmax	5.2 mm
Re	2.5 Ω
Bl	16.1 T·m
Mms	138 g
Pe	300 W
Sensitivity	104.2 dB

Alignment hint

EBP	120 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 55.3 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 2240H	30 =	0.224 =	481.4 =	5.1 -0.1	100.4 -3.8	close	8 Ω vs 4 Ω: amp load changes · Xmax 5.1 mm < 5.2 mm: lower excursion-limited SPL	+
JBL E155-4	30 =	0.2 -0.03	424.8 -56.6	5.1 -0.1	104.2 =	close	Xmax 5.1 mm < 5.2 mm: lower excursion-limited SPL	+
JBL 2240H/G	30 =	0.23 =	480 -1.4	5.5 +0.3	99 -5.2	close	8 Ω vs 4 Ω: amp load changes	+
RCF L 18P751	30 =	0.238 +0.01	400 -81.4	5 -0.2	100.3 -3.9	close	8 Ω vs 4 Ω: amp load changes · Xmax 5 mm < 5.2 mm: lower excursion-limited SPL	+
JBL E155-8	30 =	0.2 -0.03	424.8 -56.6	5.1 -0.1	100.4 -3.8	usable	8 Ω vs 4 Ω: amp load changes · Xmax 5.1 mm < 5.2 mm: lower excursion-limited SPL	+
AE Speakers TD18H+	29 -1	0.221 -0.01	390 -91.4	7 +1.8	99.7 -4.5	usable	8 Ω vs 4 Ω: amp load changes	+
McCauley B1840	28 -2	0.231 =	405 -76.4	4.8 -0.4	99.1 -5.1	usable	8 Ω vs 4 Ω: amp load changes · Xmax 4.8 mm < 5.2 mm: lower excursion-limited SPL	+
AE Speakers TD18H+ 8 Ohms	29 -1	0.221 -0.01	390 -91.4	7 +1.8	99 -5.2	usable	8 Ω vs 4 Ω: amp load changes	+
PD PD 184C01	30 =	0.227 =	337.1 -144.3	7.8 +2.6	100.2 -4	usable	8 Ω vs 4 Ω: amp load changes	+
Precision Devices PD 184C01	30 =	0.227 =	337.1 -144.3	7.8 +2.6	100.2 -4	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the 2240G →

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.