Altec 420A vp Daniel 3

15" · 8 Ω · 25 W · 93.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	26.9 Hz
Qts	0.694
Qes	0.817
Qms	4.628
Vas	393.7 L
Sd	855.3 cm²
Xmax	2.8 mm
Re	4.79 Ω
Bl	9.5 T·m
Mms	91 g
Pe	25 W
Sensitivity	93.9 dB

Alignment hint

EBP	33 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 10325.6 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
Europsonic HPC38/100	24.9 -2	0.66 -0.03	425.4 +31.7	4.3 +1.5	92 -1.9	close		+
Klipsch K33E	27 +0.1	0.63 -0.06	343 -50.7	4 +1.2	95.5 +1.6	close	4 Ω vs 8 Ω: amp load changes	+
Klipsch K34E	28 +1.1	0.63 -0.06	343 -50.7	4 +1.2	95.5 +1.6	close	4 Ω vs 8 Ω: amp load changes	+
Altec 420A vp Daniel 2	27.6 +0.7	0.919 +0.23	413.4 +19.7	2.8 =	93.1 -0.8	usable		+
Supravox 400-2000EXC_07V	25 -1.9	0.599 -0.09	444 +50.3	5 +2.2	93.3 -0.6	usable		+
Pyle Audio PPA15 vp	26.7 -0.2	0.669 -0.02	322 -71.7	5.4 +2.6	90.4 -3.5	usable	16 Ω vs 8 Ω: amp load changes	+
Goldwood GW-1558	31 +4.1	0.628 -0.07	399.7 +6	2 -0.8	95.7 +1.8	usable	Xmax 2 mm < 2.8 mm: lower excursion-limited SPL	+
Jamo 20388 - 15	27 +0.1	0.848 +0.15	495 +101.3	6 +3.2	93.3 -0.6	usable		+
Jamo 20388	27 +0.1	0.848 +0.15	495.6 +101.9	6 +3.2	93.3 -0.6	usable		+
Celestion K15T-100	35 +8.1	0.616 -0.08	364.7 -29	3 +0.2	96.3 +2.4	usable		+

Compare the closest 3 against the 420A vp Daniel 3 →

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.