Monacor SP-305I

12" · 8 Ω · 175 W · 93.6 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	40 Hz
Qts	0.48
Qes	0.61
Qms	2.25
Vas	118 L
Sd	495 cm²
Xmax	4 mm
Re	6.8 Ω
Bl	11.4 T·m
Mms	46.1 g
Pe	175 W
Sensitivity	93.6 dB

Alignment hint

EBP	66 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 100.8 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
MCM Electronics 55-2973	42 +2	0.481 =	122.6 +4.6	5 +1	94.5 +0.9	close	120 W vs 175 W: lower power handling	+
MCM Electronics 55-3212	38.5 -1.5	0.477 =	122.6 +4.6	4.7 +0.7	96.6 +3	close	4 Ω vs 8 Ω: amp load changes · 100 W vs 175 W: lower power handling	+
Eminence ME12/200LF	36.4 -3.6	0.482 =	131.9 +13.9	3.7 -0.3	93.3 -0.3	close	Xmax 3.7 mm < 4 mm: lower excursion-limited SPL	+
Eminence MME 2008 LF	36.4 -3.6	0.482 =	131.9 +13.9	3.7 -0.3	93.3 -0.3	close	Xmax 3.7 mm < 4 mm: lower excursion-limited SPL	+
Conrad CPA12-100FR	41.7 +1.7	0.436 -0.04	109.5 -8.5	4 =	94.5 +0.9	close	100 W vs 175 W: lower power handling	+
Conrad PA 12	42.9 +2.9	0.462 -0.02	129.2 +11.2	4 =	95.2 +1.6	close		+
Audax LFP501	40 =	0.521 +0.04	138 +20	4.5 +0.5	94.6 +1	close		+
Audax PR30ST100	40 =	0.521 +0.04	138 +20	4.5 +0.5	94.6 +1	close	100 W vs 175 W: lower power handling	+
Visaton BZ300 4 Ohms	36 -4	0.483 =	129 +11	5 +1	95.7 +2.1	close	4 Ω vs 8 Ω: amp load changes	+
Siare 31TE vp 2	41.3 +1.3	0.506 +0.03	99.9 -18.1	4.7 +0.7	95.6 +2	close	120 W vs 175 W: lower power handling	+

Compare the closest 3 against the SP-305I →

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.