Eminence DEFINIMAX 4012ULF-8

12" · 8 Ω · 1200 W · 91 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	40 Hz
Qts	0.31
Qes	0.318
Qms	12.13
Vas	41.342 L
Sd	532 cm²
Xmax	6.7 mm
Re	6.2 Ω
Bl	27.38 T·m
Mms	153 g
Pe	1200 W
Sensitivity	91 dB

Alignment hint

EBP	126 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 9.8 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
B&C 12 BG 100	39 -1	0.333 +0.02	41 -0.34	7.8 +1.1	92.4 +1.4	close		+
Sica 12 SR 4 CP	38 -2	0.3 -0.01	41.7 +0.36	9 +2.3	92.6 +1.6	close		+
B&C 12BG100	39 -1	0.33 +0.02	41 -0.34	10.5 +3.8	93 +2	close		+
Soundstream SPLX-122	35 -5	0.322 +0.01	40.2 -1.14	8 +1.3	92 +1	close	750 W vs 1200 W: lower power handling	+
Pioneer TS-W1200PRO	40 =	0.376 +0.07	45.6 +4.26	5.8 -0.9	91.3 +0.3	close	450 W vs 1200 W: lower power handling · Xmax 5.8 mm < 6.7 mm: lower excursion-limited SPL	+
Sica 12 PNS 4	41.7 +1.7	0.31 =	50.2 +8.86	9.5 +2.8	94.5 +3.5	close		+
PHL Audio 4021 vp kaz1	40.4 +0.4	0.354 +0.04	46.3 +4.96	5.5 -1.2	92.8 +1.8	usable	450 W vs 1200 W: lower power handling · Xmax 5.5 mm < 6.7 mm: lower excursion-limited SPL	+
B&C 12FG100	34 -6	0.32 +0.01	53 +11.66	10.3 +3.6	91 =	usable	4 Ω vs 8 Ω: amp load changes	+
Faital PRO 12RS550	42 +2	0.37 +0.06	45.4 +4.06	9.25 +2.55	93 +2	usable	500 W vs 1200 W: lower power handling	+
B&C 12PS100	44 +4	0.27 -0.04	47 +5.66	8 +1.3	93 +2	usable	700 W vs 1200 W: lower power handling	+

Compare the closest 3 against the DEFINIMAX 4012ULF-8 →

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.