RCF MB 12X351

12" · 8 Ω · 700 W · 98.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	55 Hz
Qts	0.258
Qes	0.27
Qms	5.9
Vas	46 L
Sd	530 cm²
Xmax	5 mm
Re	5.4 Ω
Bl	22.3 T·m
Mms	71.7 g
Pe	700 W
Sensitivity	98.2 dB

Alignment hint

EBP	204 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 7.1 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
Oberton 12MB35	51.43 -3.57	0.267 +0.01	50.07 +4.07	6.75 +1.75	98 -0.2	close		+
B&C 12CLA76	52 -3	0.25 -0.01	56 +10	5.3 +0.3	98.5 +0.3	close	350 W vs 700 W: lower power handling	+
B&C 12 NDL 88	51 -4	0.274 +0.02	52 +6	5.7 +0.7	97.8 -0.4	close		+
Sica 12 K 4 PL	48.5 -6.5	0.25 -0.01	47.4 +1.4	7 +2	97.1 -1.1	close		+
Fane Colossus 12MB	55 =	0.286 +0.03	56 +10	5.5 +0.5	98 -0.2	close	500 W vs 700 W: lower power handling	+
B&C 12NDL88	51 -4	0.27 +0.01	52 +6	8 +3	98 -0.2	close		+
Precision Devices PD123 ER	60.5 +5.5	0.247 -0.01	51 +5	6.5 +1.5	97 -1.2	close	16 Ω vs 8 Ω: amp load changes · 400 W vs 700 W: lower power handling	+
RCF LF 12G300	54 -1	0.285 +0.03	55 +9	4.6 -0.4	98.1 -0.1	close	450 W vs 700 W: lower power handling · Xmax 4.6 mm < 5 mm: lower excursion-limited SPL	+
Faital PRO 12HP1020	55 =	0.27 +0.01	38.6 -7.4	9 +4	97 -1.2	close		+
18 Sound 12W750	55 =	0.27 +0.01	58 +12	7 +2	97 -1.2	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the MB 12X351 →

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.