Altec 415C

15" · 8 Ω · 50 W · 97.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	24.6 Hz
Qts	0.526
Qes	0.602
Qms	4.191
Vas	749.2 L
Sd	883 cm²
Xmax	3 mm
Re	4.2 Ω
Bl	8.1 T·m
Mms	61.2 g
Pe	50 W
Sensitivity	97.4 dB

Alignment hint

EBP	41 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 928.2 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
Altec 420A	22.6 -2	0.473 -0.05	798.5 +49.3	2.8 -0.2	97 -0.4	close	25 W vs 50 W: lower power handling · Xmax 2.8 mm < 3 mm: lower excursion-limited SPL	+
Europsonic TS38/300	30 +5.4	0.553 +0.03	608.5 -140.7	4.5 +1.5	97.5 +0.1	usable		+
Altec 420A vp Daniel 1	23.6 -1	0.555 +0.03	509.1 -240.1	2.8 -0.2	94 -3.4	usable	25 W vs 50 W: lower power handling · Xmax 2.8 mm < 3 mm: lower excursion-limited SPL	+
Altec 416-8 Heathkit	26.9 +2.3	0.466 -0.06	498 -251.2	3.8 +0.8	94.6 -2.8	usable		+
EMS B15EX-05.0V	22 -2.6	0.374 -0.15	791 +41.8	7 +4	96.1 -1.3	usable		+
Sphynx SP-W15-BP	23.8 -0.8	0.757 +0.23	762.4 +13.2	4 +1	92.5 -4.9	usable		+
Stromberg-Carlson 15 PO	24.6 =	0.563 +0.04	461.6 -287.6	5 +2	91.8 -5.6	usable	16 Ω vs 8 Ω: amp load changes	+
Supravox 400-2000EXC_07V	25 +0.4	0.599 +0.07	444 -305.2	5 +2	93.3 -4.1	usable		+
Supravox 400-2000EXC_09V	25 +0.4	0.431 -0.1	440 -309.2	5 +2	94.8 -2.6	usable		+
Altec 416-8A	24.5 -0.1	0.287 -0.24	695 -54.2	3.8 +0.8	98.6 +1.2	usable		+

Compare the closest 3 against the 415C →

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.