Altec 411-8A

15" · 8 Ω · 100 W · 94.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	18.3 Hz
Qts	0.326
Qes	0.37
Qms	2.71
Vas	899.3 L
Sd	822.6 cm²
Xmax	7.1 mm
Re	6.8 Ω
Bl	13 T·m
Mms	79.8 g
Pe	100 W
Sensitivity	94.4 dB

Alignment hint

EBP	49 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 242.7 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
Fostex FW 405	20 +1.7	0.336 +0.01	595 -304.3	7 -0.1	93.9 -0.5	usable	Xmax 7 mm < 7.1 mm: lower excursion-limited SPL	+
EMS B15EX-05.0V	22 +3.7	0.374 +0.05	791 -108.3	7 -0.1	96.1 +1.7	usable	Xmax 7 mm < 7.1 mm: lower excursion-limited SPL	+
SB Acoustics SB42FHCL75-6	18.4 +0.1	0.307 -0.02	462 -437.3	11.5 +4.4	93.9 -0.5	usable		+
Fostex FW 407	19 +0.7	0.283 -0.04	715 -184.3	4.3 -2.8	95 +0.6	usable	Xmax 4.3 mm < 7.1 mm: lower excursion-limited SPL	+
Supravox 400-2000 vp1	21 +2.7	0.283 -0.04	780 -119.3	5 -2.1	96.8 +2.4	usable	Xmax 5 mm < 7.1 mm: lower excursion-limited SPL	+
Focal AUDIOM 15AX	22.8 +4.5	0.311 -0.02	635 -264.3	6 -1.1	96.9 +2.5	usable	Xmax 6 mm < 7.1 mm: lower excursion-limited SPL	+
Focal AUDIOM 15VX v2	18.4 +0.1	0.224 -0.1	727 -172.3	6 -1.1	96.1 +1.7	usable	Xmax 6 mm < 7.1 mm: lower excursion-limited SPL	+
Monacor SP-380P v2000	20 +1.7	0.337 +0.01	450 -449.3	9.4 +2.3	92.5 -1.9	usable		+
Supravox 400-2000 vp moy1 et 2	21.1 +2.8	0.273 -0.05	748 -151.3	5 -2.1	96.8 +2.4	usable	Xmax 5 mm < 7.1 mm: lower excursion-limited SPL	+
Audiotechnology FLEXUNIT 15E1022510	18 -0.3	0.222 -0.1	600 -299.3	8.6 +1.5	94.5 +0.1	usable		+

Compare the closest 3 against the 411-8A →

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.