RCF MB 12G300

12" · 8 Ω · 400 W · 100.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	61 Hz
Qts	0.301
Qes	0.32
Qms	5.2
Vas	57 L
Sd	526.6 cm²
Xmax	4.3 mm
Re	5 Ω
Bl	16.7 T·m
Mms	46.4 g
Pe	400 W
Sensitivity	100.1 dB

Alignment hint

EBP	191 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 12.6 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
Electro-Voice DL12BFH	60 -1	0.307 +0.01	55 -2	4 -0.3	100.3 +0.2	close	300 W vs 400 W: lower power handling · Xmax 4 mm < 4.3 mm: lower excursion-limited SPL	+
18 Sound 12NCX750	58 -3	0.296 -0.01	63 +6	4.6 +0.3	99.7 -0.4	close		+
Fane Colossus 12MB	55 -6	0.286 -0.02	56 -1	5.5 +1.2	98 -2.1	close		+
RCF LF 12G300	54 -7	0.285 -0.02	55 -2	4.6 +0.3	98.1 -2	close		+
Celestion NTR12-3018D	56.4 -4.6	0.295 -0.01	51.8 -5.2	3.9 -0.4	97.9 -2.2	close	Xmax 3.9 mm < 4.3 mm: lower excursion-limited SPL	+
Peavey 1205-8 v1993	55.6 -5.4	0.281 -0.02	69 +12	4.5 +0.2	100 -0.1	close		+
RCF L 12L750	62 +1	0.271 -0.03	52 -5	3.5 -0.8	100.2 +0.1	close	Xmax 3.5 mm < 4.3 mm: lower excursion-limited SPL	+
RCF 12 CX251	60 -1	0.266 -0.03	62 +5	3.7 -0.6	100.6 +0.5	close	300 W vs 400 W: lower power handling · Xmax 3.7 mm < 4.3 mm: lower excursion-limited SPL	+
RCF CX 12N251	60 -1	0.266 -0.03	62 +5	3.7 -0.6	100.6 +0.5	close	300 W vs 400 W: lower power handling · Xmax 3.7 mm < 4.3 mm: lower excursion-limited SPL	+
BMS 12C382	52 -9	0.285 -0.02	57 =	4.5 +0.2	97.6 -2.5	close		+

Compare the closest 3 against the MB 12G300 →

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.