MTX Audio RT15-04

15" · 4 Ω · 300 W · 90.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	20 Hz
Qts	0.479
Qes	0.52
Qms	6.07
Vas	223 L
Sd	829 cm²
Xmax	10.3 mm
Re	3.6 Ω
Bl	15.4 T·m
Mms	273.6 g
Pe	300 W
Sensitivity	90.8 dB

Alignment hint

EBP	38 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 189.1 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
Dayton Audio UM15-22 ULTIMAX DVC	19.5 -0.5	0.474 -0.01	224.3 +1.3	9.5 -0.8	90.2 -0.6	close	Xmax 9.5 mm < 10.3 mm: lower excursion-limited SPL	+
Dayton Audio RSS390HF-4 v2015	19.5 -0.5	0.429 -0.05	212 -11	12 +1.7	91.2 +0.4	close		+
GRS 15SSW-4HE	20.7 +0.7	0.487 +0.01	196.6 -26.4	9.5 -0.8	89.8 -1	close	8 Ω vs 4 Ω: amp load changes · Xmax 9.5 mm < 10.3 mm: lower excursion-limited SPL	+
Dayton Audio DVC385-88	20.9 +0.9	0.446 -0.03	237 +14	11.1 +0.8	93.8 +3	close		+
Oxygen AIR2 380	22.7 +2.7	0.543 +0.06	202.2 -20.8	11.5 +1.2	91.6 +0.8	close		+
Dayton Audio DCS380-4	22.9 +2.9	0.504 +0.03	233.9 +10.9	8.4 -1.9	92.9 +2.1	usable	Xmax 8.4 mm < 10.3 mm: lower excursion-limited SPL	+
Dayton Audio IB385-8	21.5 +1.5	0.588 +0.11	248.9 +25.9	12.4 +2.1	89.8 -1	usable	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio RSS390HF-4	18 -2	0.423 -0.06	281.8 +58.8	14 +3.7	91.1 +0.3	usable		+
Hertz Audio ES380	24 +4	0.52 +0.04	220 -3	9 -1.3	93.7 +2.9	usable	Xmax 9 mm < 10.3 mm: lower excursion-limited SPL	+
Powerbass M-1504	22 +2	0.442 -0.04	181.7 -41.3	11 +0.7	87.7 -3.1	usable		+

Compare the closest 3 against the RT15-04 →

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.