Fostex FW 405

15" · 8 Ω · 150 W · 93.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	20 Hz
Qts	0.336
Qes	0.36
Qms	4.99
Vas	595 L
Sd	886.7 cm²
Xmax	7 mm
Re	6.8 Ω
Bl	16.7 T·m
Mms	117.3 g
Pe	150 W
Sensitivity	93.9 dB

Alignment hint

EBP	56 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 173.5 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
Monacor SP-380P v2000	20 =	0.337 =	450 -145	9.4 +2.4	92.5 -1.4	close		+
SB Acoustics SB42FHCL75-6	18.4 -1.6	0.307 -0.03	462 -133	11.5 +4.5	93.9 =	usable		+
Altec 411-8A	18.3 -1.7	0.326 -0.01	899.3 +304.3	7.1 +0.1	94.4 +0.5	usable	100 W vs 150 W: lower power handling	+
AE Speakers TD15S	22.8 +2.8	0.371 +0.03	467 -128	7 =	95.1 +1.2	usable		+
Focal AUDIOM 15AX	22.8 +2.8	0.311 -0.03	635 +40	6 -1	96.9 +3	usable	Xmax 6 mm < 7 mm: lower excursion-limited SPL	+
Monacor SPH-390TC 8 Ohms	22 +2	0.272 -0.06	531 -64	7 =	96.1 +2.2	usable		+
EMS B15EX-05.0V	22 +2	0.374 +0.04	791 +196	7 =	96.1 +2.2	usable	100 W vs 150 W: lower power handling	+
AE Speakers TD15S-4 Ohms	22.8 +2.8	0.371 +0.03	467 -128	7 =	96.9 +3	usable	4 Ω vs 8 Ω: amp load changes	+
AE Speakers TD15S-4ohm	22.8 +2.8	0.371 +0.03	467 -128	7 =	96.9 +3	usable	4 Ω vs 8 Ω: amp load changes	+
Altec 927-8A	22.9 +2.9	0.278 -0.06	496.1 -98.9	8.3 +1.3	95.1 +1.2	usable		+

Compare the closest 3 against the FW 405 →

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.