18 Sound 12MB777

12" · 8 Ω · 450 W · 101.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	49 Hz
Qts	0.19
Qes	0.2
Qms	4.7
Vas	101 L
Sd	531 cm²
Xmax	4.5 mm
Re	5 Ω
Bl	17.8 T·m
Mms	41 g
Pe	450 W
Sensitivity	101.5 dB

Alignment hint

EBP	245 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 7.9 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 12MB700	49 =	0.19 =	101 =	4.5 =	101.5 =	close		+
18 Sound 12MB600	46 -3	0.19 =	86 -15	4.5 =	101 -0.5	close	4 Ω vs 8 Ω: amp load changes	+
18 Sound 12ND710	52 +3	0.2 +0.01	92 -9	5 +0.5	101 -0.5	close		+
RCF L 12/584	49 =	0.186 =	100 -1	3 -1.5	101.6 +0.1	close	200 W vs 450 W: lower power handling · Xmax 3 mm < 4.5 mm: lower excursion-limited SPL	+
18 Sound 12MB600	44 -5	0.18 -0.01	115 +14	4.5 =	101 -0.5	close		+
PHL Audio 4050	49 =	0.197 +0.01	84 -17	4.1 -0.4	100.1 -1.4	close	350 W vs 450 W: lower power handling · Xmax 4.1 mm < 4.5 mm: lower excursion-limited SPL	+
RCF L 12G301	48 -1	0.219 +0.03	97 -4	5.6 +1.1	100.1 -1.4	close		+
Oberton 12NXL400	48.6 -0.4	0.203 +0.01	79.24 -21.76	5.25 +0.75	101 -0.5	close		+
PHL Audio 4090	39 -10	0.19 =	92 -9	5.1 +0.6	100.6 -0.9	close	4 Ω vs 8 Ω: amp load changes	+
B&C 12 PE 32	51 +2	0.185 -0.01	101 =	2.8 -1.7	101.9 +0.4	close	250 W vs 450 W: lower power handling · Xmax 2.8 mm < 4.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 12MB777 →

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.