RCF MB 12G301

12" · 8 Ω · 400 W · 99.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	53 Hz
Qts	0.264
Qes	0.28
Qms	4.7
Vas	72 L
Sd	530 cm²
Xmax	4.8 mm
Re	5.4 Ω
Bl	17.8 T·m
Mms	49.3 g
Pe	400 W
Sensitivity	99.5 dB

Alignment hint

EBP	189 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 11.7 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
18 Sound 12CX800	53 =	0.253 -0.01	73 +1	4.7 -0.1	99.4 -0.1	close	Xmax 4.7 mm < 4.8 mm: lower excursion-limited SPL	+
RCF MB 12N301	54 +1	0.24 -0.02	71 -1	4.9 +0.1	99.7 +0.2	close		+
18 Sound 12ND830	55 +2	0.28 +0.02	72 =	6.5 +1.7	99 -0.5	close		+
B&C 12NDL76	50 -3	0.27 +0.01	69 -3	7 +2.2	100 +0.5	close	16 Ω vs 8 Ω: amp load changes	+
Peavey 1205-8 v1993	55.6 +2.6	0.281 +0.02	69 -3	4.5 -0.3	100 +0.5	close	Xmax 4.5 mm < 4.8 mm: lower excursion-limited SPL	+
LaVoce WAF123.03	50 -3	0.287 +0.02	70 -2	5.5 +0.7	99 -0.5	close		+
Oberton 12B400	50.47 -2.53	0.249 -0.02	74.74 +2.74	5.25 +0.45	98 -1.5	close		+
Peavey BLACK WIDOW 1205-8	55.6 +2.6	0.28 +0.02	69 -3	4.5 -0.3	98 -1.5	close	5.2 Ω vs 8 Ω: amp load changes · Xmax 4.5 mm < 4.8 mm: lower excursion-limited SPL	+
Master Audio HPLSN12-500	52 -1	0.283 +0.02	65 -7	5 +0.2	97.7 -1.8	close		+
RCF MB 12X301	50 -3	0.29 +0.03	70 -2	5.9 +1.1	98.3 -1.2	close		+

Compare the closest 3 against the MB 12G301 →

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.