Fostex FW 305

12" · 8 Ω · 60 W · 94.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	25 Hz
Qts	0.254
Qes	0.28
Qms	2.73
Vas	254 L
Sd	530.9 cm²
Xmax	4.8 mm
Re	6.6 Ω
Bl	15.3 T·m
Mms	63 g
Pe	60 W
Sensitivity	94.3 dB

Alignment hint

EBP	89 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 37.6 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
Tonsil GDN 30/80/2	25 =	0.26 +0.01	270 +16	6 +1.2	93.5 -0.8	close		+
ATC SB75-314 SC	23 -2	0.25 =	245 -9	5 +0.2	93.7 -0.6	close		+
Fostex W 300 A	25 =	0.281 +0.03	227 -27	4.6 -0.2	93.4 -0.9	close	Xmax 4.6 mm < 4.8 mm: lower excursion-limited SPL	+
Fostex W 300 AII	25 =	0.281 +0.03	227 -27	4.6 -0.2	93.4 -0.9	close	Xmax 4.6 mm < 4.8 mm: lower excursion-limited SPL	+
Audiotechnology FLEXUNIT 12B772510	25 =	0.299 +0.04	250 -4	8.6 +3.8	94.3 =	close		+
JBL 2214H	23 -2	0.244 -0.01	223.7 -30.3	6.6 +1.8	93.9 -0.4	close		+
Monacor SPP-300/AD	23 -2	0.265 +0.01	305 +51	5 +0.2	93.9 -0.4	close		+
SEAS 33F-WKA MINE	24.8 -0.2	0.236 -0.02	206.1 -47.9	4.5 -0.3	94.4 +0.1	close	Xmax 4.5 mm < 4.8 mm: lower excursion-limited SPL	+
Eminence W1238R	21.5 -3.5	0.252 =	236.6 -17.4	8.2 +3.4	93.6 -0.7	close		+
Audiotechnology FLEXUNITS 12 B 77 25 10	25 =	0.3 +0.05	250 -4	4.3 -0.5	92.4 -1.9	close	Xmax 4.3 mm < 4.8 mm: lower excursion-limited SPL	+

Compare the closest 3 against the FW 305 →

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.