Monacor SP-300GI

12" · 8 Ω · 150 W · 94.9 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	65 Hz
Qts	0.969
Qes	1.28
Qms	3.99
Vas	75 L
Sd	510 cm²
Xmax	3.2 mm
Re	6.5 Ω
Bl	7.8 T·m
Mms	29.1 g
Pe	150 W
Sensitivity	94.9 dB

Alignment hint

EBP	51 · flexible
Sealed Vb (Qtc ≈ 0.71)	Qts too high

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
Mercuriale PTR 306 M0	58 -7	0.808 -0.16	70.1 -4.9	3.9 +0.7	94.6 -0.3	usable		+
Celestion TF 1215	62 -3	0.857 -0.11	69 -6	2.5 -0.7	96.2 +1.3	usable	Xmax 2.5 mm < 3.2 mm: lower excursion-limited SPL	+
Fonestar FPW 350	52 -13	0.876 -0.09	65 -10	3.7 +0.5	91.8 -3.1	usable		+
SICA 12 D 1.5 CS 8 Ohms	62 -3	0.748 -0.22	63.5 -11.5	2.7 -0.5	96.8 +1.9	usable	100 W vs 150 W: lower power handling · Xmax 2.7 mm < 3.2 mm: lower excursion-limited SPL	+
Sica 12 D 1.5 CS	62 -3	0.75 -0.22	63.5 -11.5	2.7 -0.5	96.9 +2	usable	Xmax 2.7 mm < 3.2 mm: lower excursion-limited SPL	+
Celestion F12M-150 Triple Cone	69.4 +4.4	0.906 -0.06	46.9 -28.1	2.3 -0.9	95.2 +0.3	usable	Xmax 2.3 mm < 3.2 mm: lower excursion-limited SPL	+
Elokance 12WF500	50 -15	1.102 +0.13	99.1 +24.1	3.6 +0.4	93.2 -1.7	usable		+
Siemens KL405	75.8 +10.8	0.77 -0.2	68 -7	3 -0.2	99.2 +4.3	usable	Xmax 3 mm < 3.2 mm: lower excursion-limited SPL	+
Siare 31TE vp	53.4 -11.6	0.746 -0.22	62 -13	4.1 +0.9	93.8 -1.1	usable		+
Supravox T285HF64	55 -10	0.6 -0.37	74.6 -0.4	3.3 +0.1	95.6 +0.7	usable	70 W vs 150 W: lower power handling	+

Compare the closest 3 against the SP-300GI →

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.