Monacor SP-304PA

12" · 4 Ω · 175 W · 95 dB

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	35.8 Hz
Qts	0.519
Qes	0.6
Qms	3.87
Vas	117 L
Sd	514 cm²
Xmax	3.3 mm
Re	3.6 Ω
Bl	9.2 T·m
Mms	62.6 g
Pe	175 W
Sensitivity	95 dB

Alignment hint

EBP	60 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 136.6 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
Visaton BZ300 4 Ohms	36 +0.2	0.483 -0.04	129 +12	5 +1.7	95.7 +0.7	close		+
Eminence ME12/200LF	36.4 +0.6	0.482 -0.04	131.9 +14.9	3.7 +0.4	93.3 -1.7	close	8 Ω vs 4 Ω: amp load changes	+
Eminence MME 2008 LF	36.4 +0.6	0.482 -0.04	131.9 +14.9	3.7 +0.4	93.3 -1.7	close	8 Ω vs 4 Ω: amp load changes	+
Monacor SP-305I	40 +4.2	0.48 -0.04	118 +1	4 +0.7	93.6 -1.4	close	8 Ω vs 4 Ω: amp load changes	+
Audax LFP501	40 +4.2	0.521 =	138 +21	4.5 +1.2	94.6 -0.4	close	8 Ω vs 4 Ω: amp load changes	+
Audax PR30ST100	40 +4.2	0.521 =	138 +21	4.5 +1.2	94.6 -0.4	close	8 Ω vs 4 Ω: amp load changes · 100 W vs 175 W: lower power handling	+
Infinity 120W.IB	32 -3.8	0.527 +0.01	127 +10	8.1 +4.8	94.9 -0.1	close		+
MCM Electronics 55-3212	38.5 +2.7	0.477 -0.04	122.6 +5.6	4.7 +1.4	96.6 +1.6	close	100 W vs 175 W: lower power handling	+
MCM Electronics 55-2973	42 +6.2	0.481 -0.04	122.6 +5.6	5 +1.7	94.5 -0.5	close	8 Ω vs 4 Ω: amp load changes · 120 W vs 175 W: lower power handling	+
Siare 31TE vp 2	41.3 +5.5	0.506 -0.01	99.9 -17.1	4.7 +1.4	95.6 +0.6	close	8 Ω vs 4 Ω: amp load changes · 120 W vs 175 W: lower power handling	+

Compare the closest 3 against the SP-304PA →

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.