Fostex PS 300

12" · 8 Ω · 75 W · 95.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	58 Hz
Qts	0.857
Qes	0.93
Qms	10.99
Vas	102.2 L
Sd	572.6 cm²
Xmax	1.9 mm
Re	7.2 Ω
Bl	9.8 T·m
Mms	33.9 g
Pe	75 W
Sensitivity	95.8 dB

Alignment hint

EBP	62 · flexible
Sealed Vb (Qtc ≈ 0.71)	Qts too high

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
Celestion TF 1215	62 +4	0.857 =	69 -33.2	2.5 +0.6	96.2 +0.4	usable		+
Supravox 285 T vp2020	58.6 +0.6	0.81 -0.05	134.7 +32.5	1.8 -0.1	98.2 +2.4	usable	12 W vs 75 W: lower power handling · Xmax 1.8 mm < 1.9 mm: lower excursion-limited SPL	+
Eminence ALPHA-12A	49 -9	0.77 -0.09	121.5 +19.3	2.4 +0.5	95.6 -0.2	usable		+
Eminence ALPHA 12	49 -9	0.775 -0.08	121.5 +19.3	2.4 +0.5	95.1 -0.7	usable		+
Eminence ALPHA 12 A	49 -9	0.775 -0.08	121.5 +19.3	2.4 +0.5	95.1 -0.7	usable		+
Beyma 12AG	60 +2	0.709 -0.15	92 -10.2	1.5 -0.4	96.3 +0.5	usable	Xmax 1.5 mm < 1.9 mm: lower excursion-limited SPL	+
Mercuriale PTR 306 M0	58 =	0.808 -0.05	70.1 -32.1	3.9 +2	94.6 -1.2	usable		+
Eminence ALPHA 12A	49 -9	0.77 -0.09	121.5 +19.3	2.4 +0.5	93.9 -1.9	usable		+
Cabasse 30M20S	60 +2	0.635 -0.22	99.4 -2.8	4.5 +2.6	94.8 -1	usable	16 Ω vs 8 Ω: amp load changes	+
Audax PR300T0	48 -10	0.824 -0.03	142 +39.8	3.5 +1.6	95.4 -0.4	usable		+

Compare the closest 3 against the PS 300 →

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.