Polk Audio MM1240

12" · 4 Ω · 425 W · 92 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	35 Hz
Qts	0.53
Qes	0.63
Qms	5.5
Vas	38 L
Sd	520 cm²
Xmax	25 mm
Re	3.3 Ω
Pe	425 W
Sensitivity	92 dB

Alignment hint

EBP	56 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 48.7 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
DC Audio LV4 D2	35.9 +0.9	0.5 -0.03	30.6 -7.4	11 -14	92.2 +0.2	usable	Xmax 11 mm < 25 mm: lower excursion-limited SPL	+
Orion Audio H2 12.4	33.9 -1.1	0.61 +0.08	28.35 -9.65	29 +4	84.1 -7.9	usable	8 Ω vs 4 Ω: amp load changes	+
Pioneer TS-W307D4	34.8 -0.2	0.52 -0.01	40.9 +2.9	7.4 -17.6	91.3 -0.7	usable	Xmax 7.4 mm < 25 mm: lower excursion-limited SPL	+
Monacor RAPTOR 12 MK2	34 -1	0.523 -0.01	32 -6	10.1 -14.9	89.2 -2.8	usable	Xmax 10.1 mm < 25 mm: lower excursion-limited SPL	+
Pioneer TS-SW3002S4	35 =	0.61 +0.08	35.4 -2.6	8.8 -16.2	93 +1	usable	Xmax 8.8 mm < 25 mm: lower excursion-limited SPL	+
JBL W12GTI	31.8 -3.2	0.508 -0.02	44.8 +6.8	9.9 -15.1	90.1 -1.9	usable	Xmax 9.9 mm < 25 mm: lower excursion-limited SPL	+
JBL W12GTi MKII	31.8 -3.2	0.508 -0.02	44.8 +6.8	9.9 -15.1	90.1 -1.9	usable	Xmax 9.9 mm < 25 mm: lower excursion-limited SPL	+
JBL W12GTIe	31.8 -3.2	0.508 -0.02	44.8 +6.8	9.9 -15.1	90.1 -1.9	usable	Xmax 9.9 mm < 25 mm: lower excursion-limited SPL	+
Dayton Audio TITANIC	36.3 +1.3	0.506 -0.02	44 +6	7.4 -17.6	92 =	usable	Xmax 7.4 mm < 25 mm: lower excursion-limited SPL	+
American Bass DX 12	35.6 +0.6	0.6 +0.07	41.5 +3.5	12 -13	86.2 -5.8	usable	Xmax 12 mm < 25 mm: lower excursion-limited SPL	+

Compare the closest 3 against the MM1240 →

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.