Monacor SP-305PA

12" · 8 Ω · 175 W · 99.8 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	35 Hz
Qts	0.283
Qes	0.3
Qms	4.95
Vas	315 L
Sd	495 cm²
Xmax	5.3 mm
Re	6 Ω
Bl	10 T·m
Mms	22.5 g
Pe	175 W
Sensitivity	99.8 dB

Alignment hint

EBP	117 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 60.1 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
Supravox 285 GMF vp deadharo	37.9 +2.9	0.278 =	263 -52	4 -1.3	100.3 +0.5	usable	70 W vs 175 W: lower power handling · Xmax 4 mm < 5.3 mm: lower excursion-limited SPL	+
Davis 31TCA12W	27 -8	0.283 =	335 +20	6 +0.7	96.2 -3.6	usable		+
Crites Speakers CW1228	27.7 -7.3	0.277 -0.01	286.6 -28.4	6.4 +1.1	96.3 -3.5	usable	120 W vs 175 W: lower power handling	+
Davis 31TK12	38.1 +3.1	0.314 +0.03	216 -99	5 -0.3	98 -1.8	usable	Xmax 5 mm < 5.3 mm: lower excursion-limited SPL	+
Beyma SM212	34 -1	0.258 -0.02	198 -117	8.2 +2.9	98 -1.8	usable		+
Davis 31TCA12 v2009	32.5 -2.5	0.31 +0.03	222 -93	6 +0.7	95.9 -3.9	usable		+
Davis 31TCA12 vp rc	32.5 -2.5	0.314 +0.03	222 -93	6 +0.7	96.2 -3.6	usable		+
Audax HD33S66 vp	28.8 -6.2	0.272 -0.01	441.3 +126.3	9.9 +4.6	98.5 -1.3	usable		+
Davis 31TCA12 v2012	38 +3	0.333 +0.05	216 -99	6 +0.7	97.9 -1.9	usable		+
Goodmans AXIOM 301 vp	36.4 +1.4	0.277 -0.01	234.1 -80.9	3.2 -2.1	98 -1.8	usable	40 W vs 175 W: lower power handling · Xmax 3.2 mm < 5.3 mm: lower excursion-limited SPL	+

Compare the closest 3 against the SP-305PA →

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.