Altec 414-8C

12" · 8 Ω · 150 W · 97.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	30.2 Hz
Qts	0.204
Qes	0.21
Qms	7.4
Vas	230.2 L
Sd	507.5 cm²
Xmax	4 mm
Re	6.7 Ω
Bl	16.2 T·m
Mms	43.6 g
Pe	150 W
Sensitivity	97.5 dB

Alignment hint

EBP	144 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 20.9 L

EBP > 100: favours a ported (bass-reflex) 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 414-8E	30.3 +0.1	0.195 -0.01	224 -6.2	4 =	97.9 +0.4	close		+
EMS B12 MKII	30 -0.2	0.174 -0.03	227 -3.2	4.6 +0.6	98.3 +0.8	close	100 W vs 150 W: lower power handling	+
Altec 414 Z	32 +1.8	0.219 +0.02	263 +32.8	4 =	96.2 -1.3	close	16 Ω vs 8 Ω: amp load changes	+
Audax PR330M0 v2014	26 -4.2	0.203 =	208 -22.2	4 =	95.6 -1.9	close		+
EMS B12	31 +0.8	0.168 -0.04	227 -3.2	4.4 +0.4	98.8 +1.3	close	100 W vs 150 W: lower power handling	+
Audax PR33S66	30 -0.2	0.169 -0.03	214.4 -15.8	3.8 -0.2	98.2 +0.7	close	Xmax 3.8 mm < 4 mm: lower excursion-limited SPL	+
Beyma 12XA30/ND	35 +4.8	0.21 +0.01	172 -58.2	4 =	97.2 -0.3	usable		+
Monacor SP-330PAX	33 +2.8	0.238 +0.03	190 -40.2	4.5 +0.5	97.4 -0.1	usable		+
Great Plains Audio 414-8B (16B)	25.6 -4.6	0.22 +0.02	263.1 +32.9	4 =	95.3 -2.2	usable		+
Fluxmag 1201-LB	28.9 -1.3	0.163 -0.04	196.2 -34	4 =	98.4 +0.9	usable	100 W vs 150 W: lower power handling	+

Compare the closest 3 against the 414-8C →

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.