MTX Audio RTS12-04

12" · 4 Ω · 250 W · 89.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	33.5 Hz
Qts	0.631
Qes	0.81
Qms	2.857
Vas	58.4 L
Sd	517.9 cm²
Xmax	5.8 mm
Re	3.87 Ω
Bl	12.1 T·m
Mms	145.3 g
Pe	250 W
Sensitivity	89.5 dB

Alignment hint

EBP	41 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 228.3 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
Focal R-300S	32.6 -0.9	0.582 -0.05	53.9 -4.5	6 +0.2	89.6 +0.1	close		+
Peerless SBS-300F38CP01-04	36 +2.5	0.611 -0.02	55.8 -2.6	5.9 +0.1	90.9 +1.4	close		+
JBL S2-1224	32.4 -1.1	0.581 -0.05	59.7 +1.3	5.3 -0.5	89.1 -0.4	close	8 Ω vs 4 Ω: amp load changes · Xmax 5.3 mm < 5.8 mm: lower excursion-limited SPL	+
Hertz Audio ES F30.5	38 +4.5	0.6 -0.03	60 +1.6	6 +0.2	88.6 -0.9	close		+
Alpine SWE-1241	31 -2.5	0.653 +0.02	61 +2.6	11.3 +5.5	89.6 +0.1	close		+
Rockford Fosgate R2D4-12	34.9 +1.4	0.605 -0.03	68.8 +10.4	6.5 +0.7	88.9 -0.6	close	8 Ω vs 4 Ω: amp load changes	+
Sony XS-L124P5B	33.1 -0.4	0.626 -0.01	44.5 -13.9	6 +0.2	88.8 -0.7	close		+
hertz Hertz Audio ES300.5	35 +1.5	0.66 +0.03	48.5 -9.9	6.8 +1	90.8 +1.3	close		+
Cerwin-Vega VEGA 124	30.3 -3.2	0.612 -0.02	60.3 +1.9	7 +1.2	86.4 -3.1	close	8 Ω vs 4 Ω: amp load changes	+
Kenwood W1024DB	33 -0.5	0.567 -0.06	51.3 -7.1	6.9 +1.1	91 +1.5	close		+

Compare the closest 3 against the RTS12-04 →

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.