B&C 8MBX51

8" · 8 Ω · 200 W · 96.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	8"
Impedance	8 Ω
Fs	60 Hz
Qts	0.29
Qes	0.31
Qms	5.6
Vas	23 L
Sd	220 cm²
Xmax	6 mm
Re	4.9 Ω
Bl	11.4 T·m
Mms	20 g
Pe	200 W
Sensitivity	96.5 dB

Alignment hint

EBP	194 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 4.7 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
B&C 8FMB51	67 +7	0.28 -0.01	20.7 -2.3	5.5 -0.5	96.5 =	close	Xmax 5.5 mm < 6 mm: lower excursion-limited SPL	+
Beyma 8"P300Fe/N	53 -7	0.31 +0.02	24.8 +1.8	6 =	94 -2.5	close		+
18 Sound 8NMB420	59 -1	0.31 +0.02	31 +8	5.8 -0.2	95 -1.5	usable	4 Ω vs 8 Ω: amp load changes · Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
18 Sound 8NMB420	61 +1	0.28 -0.01	33 +10	5.8 -0.2	95 -1.5	usable	Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
B&C 8MDN51	68 +8	0.27 -0.02	17.5 -5.5	6 =	97 +0.5	usable	16 Ω vs 8 Ω: amp load changes	+
18 Sound 8NW650	62 +2	0.25 -0.04	18.99 -4.01	5.5 -0.5	95 -1.5	usable	16 Ω vs 8 Ω: amp load changes · Xmax 5.5 mm < 6 mm: lower excursion-limited SPL	+
Faital PRO 8PR210	65 +5	0.29 =	15.4 -7.6	6.92 +0.92	95 -1.5	usable		+
18 Sound 8NW650	63 +3	0.25 -0.04	17.8 -5.2	5.5 -0.5	96 -0.5	usable	Xmax 5.5 mm < 6 mm: lower excursion-limited SPL	+
B&C 8MBX51	68 +8	0.38 +0.09	22 -1	6 =	97 +0.5	usable	16 Ω vs 8 Ω: amp load changes	+
18 Sound 8MB400	64 +4	0.38 +0.09	23.9 +0.9	5.8 -0.2	95 -1.5	usable	Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+

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.