Fostex W 300 AII

12" · 8 Ω · 50 W · 93.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	25 Hz
Qts	0.281
Qes	0.29
Qms	9.17
Vas	227 L
Sd	539 cm²
Xmax	4.6 mm
Re	7 Ω
Bl	16.6 T·m
Mms	72.7 g
Pe	50 W
Sensitivity	93.4 dB

Alignment hint

EBP	86 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 42.6 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
Fostex W 300 A	25 =	0.281 =	227 =	4.6 =	93.4 =	close		+
Audiotechnology FLEXUNITS 12 B 77 25 10	25 =	0.3 +0.02	250 +23	4.3 -0.3	92.4 -1	close	Xmax 4.3 mm < 4.6 mm: lower excursion-limited SPL	+
Audax HD33S66 vp - AP	26 +1	0.286 =	228 +1	3.5 -1.1	92.9 -0.5	close	Xmax 3.5 mm < 4.6 mm: lower excursion-limited SPL	+
Fostex FW 305	25 =	0.254 -0.03	254 +27	4.8 +0.2	94.3 +0.9	close		+
Tonsil GDN 30/80/2	25 =	0.26 -0.02	270 +43	6 +1.4	93.5 +0.1	close		+
MCM Electronics 55-1465 DVC 8 Ohms en série 16 Oh	25 =	0.29 +0.01	203.8 -23.2	5 +0.4	90.3 -3.1	close	16 Ω vs 8 Ω: amp load changes	+
Audiotechnology FLEXUNIT 12B772510	25 =	0.299 +0.02	250 +23	8.6 +4	94.3 +0.9	close		+
Great Plains Audio 3124 GPA	26 +1	0.288 +0.01	186.9 -40.1	6.4 +1.8	93.1 -0.3	close		+
Altec 3124	26 +1	0.288 +0.01	186.9 -40.1	6.4 +1.8	92.9 -0.5	close		+
TVM ARN 312-00/4	22 -3	0.289 +0.01	206 -21	6.4 +1.8	93.8 +0.4	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the W 300 AII →

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.