MTX Audio RT12-04

12" · 4 Ω · 250 W · 90.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	28 Hz
Qts	0.535
Qes	0.58
Qms	6.87
Vas	68 L
Sd	510 cm²
Xmax	7.5 mm
Re	3.2 Ω
Bl	13 T·m
Mms	173.2 g
Pe	250 W
Sensitivity	90.1 dB

Alignment hint

EBP	48 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 91 L

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
Wavecor SW310WA02	27.5 -0.5	0.52 -0.02	64.5 -3.5	7.4 -0.1	89.9 -0.2	close	Xmax 7.4 mm < 7.5 mm: lower excursion-limited SPL	+
MTX Audio T5512-04	29.3 +1.3	0.583 +0.05	66.9 -1.1	7.3 -0.2	89.8 -0.3	close	Xmax 7.3 mm < 7.5 mm: lower excursion-limited SPL	+
JL Audio 13TW5V2-2	27.6 -0.4	0.526 -0.01	60.3 -7.7	9 +1.5	89.2 -0.9	close		+
Focal P30F	28 =	0.467 -0.07	70 +2	9.1 +1.6	90.1 =	close		+
JBL CS1214	28 =	0.536 =	76.7 +8.7	6.1 -1.4	90.2 +0.1	close	Xmax 6.1 mm < 7.5 mm: lower excursion-limited SPL	+
Focal 33V2	28.7 +0.7	0.537 =	76.2 +8.2	7.5 =	92.5 +2.4	close		+
Alpine SWS-1241	30 +2	0.563 +0.03	65 -3	6.7 -0.8	90.1 =	close	Xmax 6.7 mm < 7.5 mm: lower excursion-limited SPL	+
Wavecor SW312WA03	28 =	0.479 -0.06	61 -7	7.3 -0.2	90.2 +0.1	close	Xmax 7.3 mm < 7.5 mm: lower excursion-limited SPL	+
Monacor BLACKBASS-12 4 Ohms	29 +1	0.482 -0.05	61 -7	7.5 =	90.1 =	close		+
Boston Acoustics G21244	28 =	0.579 +0.04	65 -3	8.2 +0.7	92.4 +2.3	close	2 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the RT12-04 →

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.