B&C 6CLA51

6.5" · 8 Ω · 250 W · 94.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	6.5"
Impedance	8 Ω
Fs	96 Hz
Qts	0.32
Qes	0.36
Qms	2.9
Vas	4.3 L
Sd	132 cm²
Xmax	4.8 mm
Re	5 Ω
Bl	11.4 T·m
Mms	15 g
Pe	250 W
Sensitivity	94.5 dB

Alignment hint

EBP	267 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 1.1 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
18 Sound 6NTLW2000	86 -10	0.35 +0.03	4.6 +0.3	4.9 +0.1	93 -1.5	close		+
18 Sound 6NTLW2000	86 -10	0.38 +0.06	4.8 +0.5	4.9 +0.1	93 -1.5	usable	16 Ω vs 8 Ω: amp load changes	+
Beyma 6CMV2	90 -6	0.34 +0.02	6.5 +2.2	5.7 +0.9	94 -0.5	usable		+
B&C 6MBX44	113 +17	0.31 -0.01	4.1 -0.2	3.5 -1.3	98 +3.5	usable	Xmax 3.5 mm < 4.8 mm: lower excursion-limited SPL	+
B&C 6CLA51	89 -7	0.41 +0.09	5.7 +1.4	5.5 +0.7	93.5 -1	usable	16 Ω vs 8 Ω: amp load changes	+
Beyma 6G40Nd/N	100 +4	0.38 +0.06	3.7 -0.6	3 -1.8	94 -0.5	usable	170 W vs 250 W: lower power handling · Xmax 3 mm < 4.8 mm: lower excursion-limited SPL	+
B&C 6MBX44	115 +19	0.35 +0.03	4 -0.3	3.5 -1.3	98 +3.5	usable	16 Ω vs 8 Ω: amp load changes · Xmax 3.5 mm < 4.8 mm: lower excursion-limited SPL	+
18 Sound 6M44	102 +6	0.29 -0.03	3.8 -0.5	2.25 -2.55	95 +0.5	usable	Xmax 2.25 mm < 4.8 mm: lower excursion-limited SPL	+
18 Sound 6NMB900	100 +4	0.34 +0.02	6.65 +2.35	3 -1.8	96 +1.5	usable	16 Ω vs 8 Ω: amp load changes · Xmax 3 mm < 4.8 mm: lower excursion-limited SPL	+
B&C 6PS44	71 -25	0.33 +0.01	7 +2.7	4.5 -0.3	93 -1.5	usable	Xmax 4.5 mm < 4.8 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 6CLA51 →

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.