Celestion AP15

15" · 4 Ω · 100 W · 97.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	29 Hz
Qts	0.546
Qes	0.607
Qms	5.447
Vas	331 L
Sd	850 cm²
Xmax	1.5 mm
Re	2.7 Ω
Bl	8.6 T·m
Mms	92.2 g
Pe	100 W
Sensitivity	97.9 dB

Alignment hint

EBP	48 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 488.8 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 420-8B vp bleu	30.2 +1.2	0.522 -0.02	303.6 -27.4	2.6 +1.1	95.7 -2.2	close	8 Ω vs 4 Ω: amp load changes · 25 W vs 100 W: lower power handling	+
Eminence BETA-15A	35 +6	0.58 +0.03	334.6 +3.6	4 +2.5	98.2 +0.3	usable	8 Ω vs 4 Ω: amp load changes	+
Altec 420-8B vp rouge	34.9 +5.9	0.53 -0.02	277.6 -53.4	2.3 +0.8	97.1 -0.8	usable	8 Ω vs 4 Ω: amp load changes · 25 W vs 100 W: lower power handling	+
P.Audio IMF HP-15W	30.8 +1.8	0.517 -0.03	304.7 -26.3	3.5 +2	94.5 -3.4	usable	8 Ω vs 4 Ω: amp load changes	+
Eminence BETA 15	35 +6	0.585 +0.04	334.6 +3.6	4 +2.5	96.6 -1.3	usable	8 Ω vs 4 Ω: amp load changes	+
Eminence BETA 15A	35 +6	0.585 +0.04	334.6 +3.6	4 +2.5	96.6 -1.3	usable	8 Ω vs 4 Ω: amp load changes	+
Klipsch K34E	28 -1	0.63 +0.08	343 +12	4 +2.5	95.5 -2.4	usable		+
Hyper Phase CM15T	35 +6	0.508 -0.04	308 -23	3.5 +2	97 -0.9	usable	8 Ω vs 4 Ω: amp load changes	+
Eminence DELTA 15 A	40 +11	0.532 -0.01	270.7 -60.3	1.6 +0.1	97.8 -0.1	usable	8 Ω vs 4 Ω: amp load changes	+
Klipsch K33E	27 -2	0.63 +0.08	343 +12	4 +2.5	95.5 -2.4	usable		+

Compare the closest 3 against the AP15 →

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.