Fostex FW 407

15" · 8 Ω · 150 W · 95 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	19 Hz
Qts	0.283
Qes	0.29
Qms	11.8
Vas	715 L
Sd	890 cm²
Xmax	4.3 mm
Re	6.8 Ω
Bl	17.5 T·m
Mms	109 g
Pe	150 W
Sensitivity	95 dB

Alignment hint

EBP	66 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 136.4 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
Audax PR38XM150	19.5 +0.5	0.27 -0.01	690 -25	3.5 -0.8	95.7 +0.7	close	Xmax 3.5 mm < 4.3 mm: lower excursion-limited SPL	+
Supravox 400-2000 vp1	21 +2	0.283 =	780 +65	5 +0.7	96.8 +1.8	close		+
Supravox 400-2000 vp moy1 et 2	21.1 +2.1	0.273 -0.01	748 +33	5 +0.7	96.8 +1.8	close		+
Supravox 400-2000 vp2	21.1 +2.1	0.261 -0.02	715 =	5 +0.7	96.8 +1.8	close		+
Great Plains Audio 416-8B v2016	21.5 +2.5	0.271 -0.01	787 +72	4 -0.3	97.2 +2.2	close	Xmax 4 mm < 4.3 mm: lower excursion-limited SPL	+
Focal AUDIOM 15VX v2	18.4 -0.6	0.224 -0.06	727 +12	6 +1.7	96.1 +1.1	usable		+
Audax HD35S66	18 -1	0.217 -0.07	735 +20	5 +0.7	96.4 +1.4	usable		+
JBL 2215A	20 +1	0.212 -0.07	736.2 +21.2	4.1 -0.2	95.8 +0.8	usable	16 Ω vs 8 Ω: amp load changes · 100 W vs 150 W: lower power handling · Xmax 4.1 mm < 4.3 mm: lower excursion-limited SPL	+
JBL LE15A	20 +1	0.212 -0.07	736.2 +21.2	4.1 -0.2	95.8 +0.8	usable	16 Ω vs 8 Ω: amp load changes · Xmax 4.1 mm < 4.3 mm: lower excursion-limited SPL	+
Focal AUDIOM 15VX v3	17.5 -1.5	0.211 -0.07	717.7 +2.7	6 +1.7	95.1 +0.1	usable		+

Compare the closest 3 against the FW 407 →

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.