JBL 1800GTI

18" · 4 Ω · 600 W · 90 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	4 Ω
Fs	30 Hz
Qts	0.42
Qes	0.45
Qms	6.77
Vas	362.46 L
Sd	1270 cm²
Xmax	5.46 mm
Re	2.5 Ω
Bl	13.51 T·m
Mms	177.77 g
Pe	600 W
Sensitivity	90 dB

Alignment hint

EBP	67 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 197.6 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
Beyma SM118	30 =	0.421 =	430 +67.54	5.5 +0.04	97.2 +7.2	usable	8 Ω vs 4 Ω: amp load changes · 400 W vs 600 W: lower power handling	+
Peavey LOW RIDER 18	28.9 -1.1	0.429 +0.01	288 -74.46	9.6 +4.14	93.7 +3.7	usable	8 Ω vs 4 Ω: amp load changes	+
McCauley 6152-8	30 =	0.434 +0.01	354 -8.46	12 +6.54	97.1 +7.1	usable	8 Ω vs 4 Ω: amp load changes	+
Beyma 18G40	31 +1	0.407 -0.01	323 -39.46	7 +1.54	96.9 +6.9	usable	8 Ω vs 4 Ω: amp load changes	+
P.Audio E-18ELF	30 =	0.44 +0.02	263.57 -98.89	7.5 +2.04	93.6 +3.6	usable	8 Ω vs 4 Ω: amp load changes	+
SB Audience BIANCO-18SW450 v2024	28 -2	0.445 +0.03	370.4 +7.94	9.1 +3.64	96.4 +6.4	usable	8 Ω vs 4 Ω: amp load changes · 450 W vs 600 W: lower power handling	+
Peerless FSL-1830R09-04	27.8 -2.2	0.427 +0.01	356 -6.46	8.5 +3.04	97.8 +7.8	usable	400 W vs 600 W: lower power handling	+
Beyma 18WRS600	30 =	0.47 +0.05	354 -8.46	8.5 +3.04	97 +7	usable	8 Ω vs 4 Ω: amp load changes	+
Sica 18 F 3 CP	31.6 +1.6	0.44 +0.02	321 -41.46	6.5 +1.04	96.9 +6.9	usable	8 Ω vs 4 Ω: amp load changes	+
B&C 18PS100	30 =	0.4 -0.02	251 -111.46	7 +1.54	94 +4	usable		+

Compare the closest 3 against the 1800GTI →

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.