B&C 8MBX51

8" · 16 Ω · 200 W · 97 dB · datasheet ↗

Thiele-Small parameters

Nominal size	8"
Impedance	16 Ω
Fs	68 Hz
Qts	0.38
Qes	0.43
Qms	3.3
Vas	22 L
Sd	220 cm²
Xmax	6 mm
Re	10.2 Ω
Bl	13.7 T·m
Mms	18.4 g
Pe	200 W
Sensitivity	97 dB

Alignment hint

EBP	158 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 8.9 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
B&C 8FMB51	68 =	0.39 +0.01	20.5 -1.5	5.5 -0.5	96 -1	close	Xmax 5.5 mm < 6 mm: lower excursion-limited SPL	+
18 Sound 8MB400	64 -4	0.38 =	23.9 +1.9	5.8 -0.2	95 -2	close	8 Ω vs 16 Ω: amp load changes · Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
18 Sound 8NMB420	66 -2	0.41 +0.03	24.53 +2.53	5.8 -0.2	95 -2	close	Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
18 Sound 8MB500	74 +6	0.43 +0.05	21.5 -0.5	6 =	95 -2	close	8 Ω vs 16 Ω: amp load changes	+
18 Sound 8MB500	73 +5	0.36 -0.02	18.4 -3.6	6 =	95 -2	close	4 Ω vs 16 Ω: amp load changes	+
Beyma 8"G40	70 +2	0.36 -0.02	17 -5	6.5 +0.5	95 -2	close	8 Ω vs 16 Ω: amp load changes	+
B&C 8FMB51	67 -1	0.28 -0.1	20.7 -1.3	5.5 -0.5	96.5 -0.5	usable	8 Ω vs 16 Ω: amp load changes · Xmax 5.5 mm < 6 mm: lower excursion-limited SPL	+
B&C 8MBX51	60 -8	0.29 -0.09	23 +1	6 =	96.5 -0.5	usable	8 Ω vs 16 Ω: amp load changes	+
18 Sound 8MB500	73 +5	0.5 +0.12	21.3 -0.7	6 =	95 -2	usable		+
Faital PRO 8PR200	58 -10	0.37 -0.01	16.9 -5.1	8.15 +2.15	95 -2	usable	8 Ω vs 16 Ω: amp load changes	+

Compare the closest 3 against the 8MBX51 →

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.