Fostex FW 800 N

31.5" · 8 Ω · 150 W · 96.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	31.5"
Impedance	8 Ω
Fs	18 Hz
Qts	0.698
Qes	0.76
Qms	8.5
Vas	3201.1 L
Sd	3581.7 cm²
Xmax	4.6 mm
Re	6.8 Ω
Bl	21.1 T·m
Mms	439.2 g
Pe	150 W
Sensitivity	96.6 dB

Alignment hint

EBP	24 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 121881 L

EBP < 50: favours a sealed (closed) 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
Clarion SRW800	17 -1	0.401 -0.3	2840.2 -360.9	13.8 +9.2	100.4 +3.8	risky	4 Ω vs 8 Ω: amp load changes	+
Fluxmag 2950-Hifi	24.4 +6.4	0.589 -0.11	1313 -1888.1	5.5 +0.9	98.2 +1.6	risky		+
Fostex L 869	15 -3	0.454 -0.24	6700 +3498.9	4 -0.6	99.3 +2.7	risky	Xmax 4 mm < 4.6 mm: lower excursion-limited SPL	+
Fluxmag 2950-Sono	27.8 +9.8	0.761 +0.06	869 -2332.1	5.5 +0.9	96.9 +0.3	risky		+
Audio Dynamique 75IC	15.2 -2.8	0.277 -0.42	4023.2 +822.1	9 +4.4	100.1 +3.5	risky		+
Electro-Voice 30W vp	16 -2	0.269 -0.43	5947.2 +2746.1	3.8 -0.8	104.1 +7.5	risky	60 W vs 150 W: lower power handling · Xmax 3.8 mm < 4.6 mm: lower excursion-limited SPL	+
Powersoft 30''-4MM M-FORCE 01 REVERSED	32 +14	0.207 -0.49	170 -3031.1	4.6 =	111.1 +14.5	risky	0.5 Ω vs 8 Ω: amp load changes	+
Powersoft 30''-4MM M-FORCE 01 SHORT	32 +14	0.207 -0.49	170 -3031.1	4.6 =	111.1 +14.5	risky	0.5 Ω vs 8 Ω: amp load changes	+
Powersoft 30''-4MM M-FORCE 01 STRAIGHT	32 +14	0.207 -0.49	170 -3031.1	4.6 =	111.1 +14.5	risky	0.5 Ω vs 8 Ω: amp load changes	+
Powersoft 30''-3MM M-FORCE 01 STRAIGHT	30 +12	0.167 -0.53	230 -2971.1	4.8 +0.2	112.5 +15.9	risky	0.5 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the FW 800 N →

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.