LII Audio F-18

18" · 8 Ω · 40 W · 98.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	38.7 Hz
Qts	0.936
Qes	0.985
Qms	18.656
Vas	661.8 L
Sd	1194.6 cm²
Xmax	3.2 mm
Re	7.2 Ω
Bl	9.5 T·m
Mms	51.2 g
Pe	40 W
Sensitivity	98.3 dB

Alignment hint

EBP	39 · sealed
Sealed Vb (Qtc ≈ 0.71)	Qts too high

EBP < 50: favours a sealed (closed) 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
Goldwood GW-1858	30 -8.7	1.066 +0.13	520 -141.8	2 -1.2	94.2 -4.1	usable	Xmax 2 mm < 3.2 mm: lower excursion-limited SPL	+
AE Speakers DIPOLE 18-D8	22.9 -15.8	0.809 -0.13	885 +223.2	9.6 +6.4	96.5 -1.8	risky	4 Ω vs 8 Ω: amp load changes	+
Lautsprecher Technik MHB18 vp	33.8 -4.9	1.045 +0.11	327.9 -333.9	6.1 +2.9	92.6 -5.7	risky		+
Peavey 1808-8 SPS BWX	37.4 -1.3	0.587 -0.35	368 -293.8	4.6 +1.4	96.6 -1.7	risky		+
Carvin PS18-8	35 -3.7	0.48 -0.46	531.785 -130.01	6 +2.8	97.7 -0.6	risky		+
Peavey 1801-8 v1993	40.2 +1.5	0.586 -0.35	321 -340.8	5 +1.8	98.1 -0.2	risky		+
Technysound TS45/500D	26.7 -12	0.683 -0.25	492 -169.8	4 +0.8	93 -5.3	risky		+
Raveland WHX 488	28 -10.7	0.978 +0.04	355 -306.8	4 +0.8	89.7 -8.6	risky	16 Ω vs 8 Ω: amp load changes	+
Selenium WPU1805-X	35 -3.7	0.706 -0.23	293 -368.8	6.3 +3.1	95.4 -2.9	risky		+
Peavey 1801-8 LT BW	40.2 +1.5	0.61 -0.33	284.9 -376.9	5 +1.8	96.5 -1.8	risky		+

Compare the closest 3 against the F-18 →

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.