McCauley B1240

12" · 8 Ω · 350 W · 96.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	38 Hz
Qts	0.286
Qes	0.3
Qms	6.18
Vas	110 L
Sd	530 cm²
Xmax	6.5 mm
Re	6 Ω
Bl	17.3 T·m
Mms	62.8 g
Pe	350 W
Sensitivity	96.3 dB

Alignment hint

EBP	127 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 21.5 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
Beyma 12LW30/N	38 =	0.287 =	109 -1	7 +0.5	96.2 -0.1	close		+
Beyma SM112/N v2021	40 +2	0.298 +0.01	117 +7	7 +0.5	96.9 +0.6	close		+
Eminence KAPPALITE 3012 LF-4	36.4 -1.6	0.308 +0.02	107.4 -2.6	8.1 +1.6	97.2 +0.9	close	4 Ω vs 8 Ω: amp load changes	+
Beyma SM112-N2	40 +2	0.298 +0.01	117.3 +7.3	5.9 -0.6	96.9 +0.6	close	250 W vs 350 W: lower power handling · Xmax 5.9 mm < 6.5 mm: lower excursion-limited SPL	+
Dayton Audio APOLLO 12N	38 =	0.261 -0.02	128.1 +18.1	6.8 +0.3	96.4 +0.1	close		+
Eminence KAPPALITE 3012 LF	37 -1	0.324 +0.04	106.7 -3.3	8.2 +1.7	95.5 -0.8	close		+
Eminence KappaLITE 3012LF	37 -1	0.32 +0.03	106.65 -3.35	9.1 +2.6	95.5 -0.8	close		+
PHL Audio 4530	37 -1	0.314 +0.03	124 +14	6 -0.5	96.3 =	close	Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
PHL Audio 4510	42 +4	0.307 +0.02	108 -2	6 -0.5	97.3 +1	close	Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
Beyma 12WR400	42 +4	0.285 =	91.1 -18.9	6.3 -0.2	96.9 +0.6	close	Xmax 6.3 mm < 6.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the B1240 →

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.