Celestion FTX1225

12" · 8 Ω · 300 W · 86.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	42.1 Hz
Qts	0.404
Qes	0.459
Qms	3.345
Vas	12.1 L
Sd	530.9 cm²
Xmax	2 mm
Re	5.74 Ω
Bl	39.3 T·m
Mms	467.5 g
Pe	300 W
Sensitivity	86.4 dB

Alignment hint

EBP	92 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 5.9 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
Rockford Fosgate T2D212	38.7 -3.4	0.489 +0.08	13.6 +1.5	7.1 +5.1	87.3 +0.9	usable	4 Ω vs 8 Ω: amp load changes	+
MTX Audio RFL12	35 -7.1	0.353 -0.05	14.6 +2.5	9.3 +7.3	90.3 +3.9	usable	4 Ω vs 8 Ω: amp load changes	+
Rockford Fosgate T2D412	39.9 -2.2	0.595 +0.19	13.6 +1.5	7.3 +5.3	83.8 -2.6	usable		+
Pioneer TS-W3002D2	30 -12.1	0.549 +0.15	13.1 +1	4.8 +2.8	87.2 +0.8	usable	2 Ω vs 8 Ω: amp load changes	+
Monacor RAPTOR 12 v2014 2	43 +0.9	0.548 +0.14	17.8 +5.7	6.8 +4.8	91.6 +5.2	risky	4 Ω vs 8 Ω: amp load changes	+
DD Audio 712D4	37.7 -4.4	0.478 +0.07	20.2 +8.1	7 +5	91.2 +4.8	risky	4 Ω vs 8 Ω: amp load changes	+
Ciare PW331	44 +1.9	0.378 -0.03	32 +19.9	2.9 +0.9	91.1 +4.7	risky	150 W vs 300 W: lower power handling	+
B&C 12 BG 76	44 +1.9	0.409 =	32 +19.9	5.1 +3.1	91.6 +5.2	risky		+
MTX Audio 812	35 -7.1	0.422 +0.02	24.6 +12.5	10 +8	81.6 -4.8	risky	32 Ω vs 8 Ω: amp load changes	+
Audio System KRYPTON 12	37 -5.1	0.39 -0.01	30 +17.9	17 +15	87.5 +1.1	risky	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the FTX1225 →

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.