Max Speaker MF300/77S4

12" · 4 Ω · 300 W · 89 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	26.4 Hz
Qts	0.383
Qes	0.42
Qms	4.33
Vas	53.1 L
Sd	487 cm²
Xmax	6.7 mm
Re	3.7 Ω
Bl	18.2 T·m
Mms	227.6 g
Pe	300 W
Sensitivity	89 dB

Alignment hint

EBP	63 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 22 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
Infinity KAPPA 120.9W	27.2 +0.8	0.43 +0.05	54.4 +1.3	6.7 =	87.9 -1.1	close	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio SS12-22	27 +0.6	0.351 -0.03	49.4 -3.7	9.6 +2.9	88.1 -0.9	close	8 Ω vs 4 Ω: amp load changes	+
Ground Zero GZRW 12XS-AL	30 +3.6	0.395 +0.01	52 -1.1	8.9 +2.2	90.4 +1.4	close		+
Sony XS-L121P5	26.4 =	0.42 +0.04	55.5 +2.4	7.5 +0.8	85.5 -3.5	close		+
DLS ULTIMATE IRIDIUM 12	33.8 +7.4	0.386 =	49.2 -3.9	7 +0.3	88.8 -0.2	close	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio MX12-22	28.8 +2.4	0.348 -0.04	45.6 -7.5	7.4 +0.7	89.5 +0.5	close		+
Resonant Engineering XXX 12D1 vp	27 +0.6	0.401 +0.02	56.5 +3.4	12.9 +6.2	92 +3	close		+
MTX Audio TX612	27 +0.6	0.393 +0.01	42.7 -10.4	9.7 +3	91 +2	close		+
Monacor SONIC 12 vp	27 +0.6	0.469 +0.09	51 -2.1	6.3 -0.4	88.1 -0.9	close	8 Ω vs 4 Ω: amp load changes · Xmax 6.3 mm < 6.7 mm: lower excursion-limited SPL	+
Infinity 120.3SE	28.4 +2	0.475 +0.09	55.6 +2.5	6.8 +0.1	89.5 +0.5	close		+

Compare the closest 3 against the MF300/77S4 →

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.