Powerbass M-124

12" · 4 Ω · 375 W · 88 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	29.15 Hz
Qts	0.41
Qes	0.463
Qms	3.6
Vas	77.3 L
Sd	511 cm²
Xmax	9.5 mm
Re	3.2 Ω
Bl	13.26 T·m
Mms	139 g
Pe	375 W
Sensitivity	88 dB

Alignment hint

EBP	63 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 39.2 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
Alpine SWG-1244	28 -1.15	0.38 -0.03	75 -2.3	10 +0.5	87.7 -0.3	close	250 W vs 375 W: lower power handling	+
Aura Sound NS12-794-4A	27 -2.15	0.423 +0.01	78 +0.7	9.9 +0.4	90.9 +2.9	close		+
Morel ULTIMO 124	26 -3.15	0.421 +0.01	73.8 -3.5	14.6 +5.1	89 +1	close		+
Infinity PRIMUS 1270	29.7 +0.55	0.49 +0.08	75.7 -1.6	11.3 +1.8	87.3 -0.7	close		+
Ground Zero GZUW 300SQ	25.3 -3.85	0.423 +0.01	86.6 +9.3	12.9 +3.4	88 =	close	8 Ω vs 4 Ω: amp load changes	+
Polk Audio DB1240	30 +0.85	0.44 +0.03	71.85 -5.45	7.5 -2	88.1 +0.1	close	Xmax 7.5 mm < 9.5 mm: lower excursion-limited SPL	+
JL Audio 12W3V3-4	26.7 -2.45	0.446 +0.04	80.6 +3.3	10.9 +1.4	90.6 +2.6	close		+
Oxygen AIR2 300 v2015	22.7 -6.45	0.388 -0.02	78 +0.7	9.9 +0.4	89.1 +1.1	close		+
JL Audio 12W6V2-D4	25 -4.15	0.45 +0.04	79.9 +2.6	12.7 +3.2	86.9 -1.1	close	8 Ω vs 4 Ω: amp load changes	+
Gladen ZERO 12 PRO	27 -2.15	0.38 -0.03	93.72 +16.42	12.5 +3	88.5 +0.5	close		+

Compare the closest 3 against the M-124 →

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.