Altec 416-8 Heathkit

15" · 8 Ω · 150 W · 94.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	26.9 Hz
Qts	0.466
Qes	0.533
Qms	3.729
Vas	498 L
Sd	825.8 cm²
Xmax	3.8 mm
Re	7.91 Ω
Bl	13 T·m
Mms	67.1 g
Pe	150 W
Sensitivity	94.6 dB

Alignment hint

EBP	50 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 382.3 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
Supravox 400-2000EXC_09V	25 -1.9	0.431 -0.04	440 -58	5 +1.2	94.8 +0.2	close		+
Fostex FW 405 N	27 +0.1	0.446 -0.02	392.5 -105.5	7.6 +3.8	94.7 +0.1	close		+
Beyma HP15	28 +1.1	0.392 -0.07	500 +2	5 +1.2	96.5 +1.9	close		+
Hyper Phase HP15-8	28 +1.1	0.392 -0.07	500 +2	5 +1.2	96.5 +1.9	close		+
Supravox 380-2000 OB	27.5 +0.6	0.451 -0.02	360 -138	6.3 +2.5	95.2 +0.6	usable		+
Stromberg-Carlson 15 PO	24.6 -2.3	0.563 +0.1	461.6 -36.4	5 +1.2	91.8 -2.8	usable	16 Ω vs 8 Ω: amp load changes	+
Supravox 400-2000EXC_07V	25 -1.9	0.599 +0.13	444 -54	5 +1.2	93.3 -1.3	usable		+
Eminence LEGEND BP1525	32 +5.1	0.479 +0.01	397 -101	6.2 +2.4	96.9 +2.3	usable		+
Altec 420A vp Daniel 1	23.6 -3.3	0.555 +0.09	509.1 +11.1	2.8 -1	94 -0.6	usable	25 W vs 150 W: lower power handling · Xmax 2.8 mm < 3.8 mm: lower excursion-limited SPL	+
Celestion K15-200E	32 +5.1	0.473 +0.01	386 -112	5 +1.2	97.7 +3.1	usable		+

Compare the closest 3 against the 416-8 Heathkit →

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.