the box 18LB100-4N

18" · 4 Ω · 800 W · 97.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	4 Ω
Fs	34 Hz
Qts	0.227
Qes	0.256
Qms	1.99
Vas	175 L
Sd	908 cm²
Xmax	5.4 mm
Re	5.8 Ω
Bl	26.5 T·m
Mms	144.7 g
Pe	800 W
Sensitivity	97.7 dB

Alignment hint

EBP	133 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 20.1 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
Fane COLOSSUS 18-1500	33.5 -0.5	0.25 +0.02	175 =	8.1 +2.7	97.8 +0.1	close	8 Ω vs 4 Ω: amp load changes	+
Void Acoustic V18-1000	34.5 +0.5	0.216 -0.01	201.7 +26.7	5.3 -0.1	99.3 +1.6	close	8 Ω vs 4 Ω: amp load changes · Xmax 5.3 mm < 5.4 mm: lower excursion-limited SPL	+
Precision Devices PD.185N02	35.2 +1.2	0.24 +0.01	178.28 +3.28	12 +6.6	96.8 -0.9	close	8 Ω vs 4 Ω: amp load changes	+
Beyma 18QLEX1600/Fe	30 -4	0.231 =	195 +20	8.3 +2.9	97.2 -0.5	close	8 Ω vs 4 Ω: amp load changes	+
Precision Devices PD.1850/2	33.1 -0.9	0.24 +0.01	203.84 +28.84	11.1 +5.7	96.7 -1	close	8 Ω vs 4 Ω: amp load changes	+
B&C 18DS100	32 -2	0.24 +0.01	157 -18	14 +8.6	98 +0.3	close		+
B&C 18 DS 115	30 -4	0.2 -0.03	168 -7	7.5 +2.1	97.4 -0.3	close	8 Ω vs 4 Ω: amp load changes	+
PD PD 185C003	33 -1	0.224 =	224 +49	8.8 +3.4	99.1 +1.4	close	8 Ω vs 4 Ω: amp load changes	+
Precision Devices PD 185C003	33 -1	0.224 =	224 +49	8.8 +3.4	99.1 +1.4	close	8 Ω vs 4 Ω: amp load changes	+
Beyma 18QLEX1600Fe	30 -4	0.23 =	195 +20	13 +7.6	97 -0.7	close	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the 18LB100-4N →

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.