Eminence DEFINIMAX 4018 LF

18" · 8 Ω · 1200 W · 96.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	32 Hz
Qts	0.348
Qes	0.36
Qms	10.38
Vas	237.9 L
Sd	1188 cm²
Xmax	8.6 mm
Re	6.19 Ω
Bl	26.7 T·m
Mms	205.7 g
Pe	1200 W
Sensitivity	96.4 dB

Alignment hint

EBP	89 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 76 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
Dayton Audio APOLLO 18N	32 =	0.338 -0.01	253.6 +15.7	9.1 +0.5	96.9 +0.5	close		+
Beyma 18P1000	32 =	0.362 +0.01	245 +7.1	8 -0.6	96.5 +0.1	close	Xmax 8 mm < 8.6 mm: lower excursion-limited SPL	+
Fane COLOSSUS 18-1000	32 =	0.319 -0.03	236 -1.9	8.9 +0.3	97 +0.6	close		+
Sica 18 S 4 CP	33 +1	0.35 =	225 -12.9	11 +2.4	97.1 +0.7	close		+
Ciare NDH18_4S	31 -1	0.319 -0.03	239 +1.1	9.4 +0.8	96.5 +0.1	close		+
Fane COLOSSUS 18XB v2016	33 +1	0.337 -0.01	236 -1.9	7.5 -1.1	96.6 +0.2	close	Xmax 7.5 mm < 8.6 mm: lower excursion-limited SPL	+
PHL Audio 7201ND	34 +2	0.355 +0.01	230 -7.9	8.5 -0.1	97.5 +1.1	close	Xmax 8.5 mm < 8.6 mm: lower excursion-limited SPL	+
Fane 18XBN	33 +1	0.337 -0.01	236 -1.9	7.5 -1.1	96.8 +0.4	close	Xmax 7.5 mm < 8.6 mm: lower excursion-limited SPL	+
Fane COLOSSUS 18XBN	33 +1	0.337 -0.01	236 -1.9	7.5 -1.1	96.8 +0.4	close	Xmax 7.5 mm < 8.6 mm: lower excursion-limited SPL	+
B&C 18TBX100	34 +2	0.35 =	212 -25.9	9 +0.4	97 +0.6	close		+

Compare the closest 3 against the DEFINIMAX 4018 LF →

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.