B&C 12NDL76

12" · 8 Ω · 400 W · 100 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	50 Hz
Qts	0.2
Qes	0.21
Qms	4.2
Vas	73 L
Sd	522 cm²
Xmax	7 mm
Re	5.3 Ω
Bl	20.1 T·m
Mms	53 g
Pe	400 W
Sensitivity	100 dB

Alignment hint

EBP	238 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 6.3 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 12NB450	46.46 -3.54	0.204 =	72.57 -0.43	7.75 +0.75	100 =	close		+
18 Sound 12ND940	49 -1	0.2 =	64.8 -8.2	7.6 +0.6	100 =	close		+
B&C 12NDL76	50 =	0.19 -0.01	70 -3	6 -1	100 =	close	4 Ω vs 8 Ω: amp load changes · Xmax 6 mm < 7 mm: lower excursion-limited SPL	+
18 Sound 12ND930	50 =	0.21 +0.01	70 -3	6.5 -0.5	98 -2	close	Xmax 6.5 mm < 7 mm: lower excursion-limited SPL	+
Beyma 12P80FE V2	50 =	0.201 =	66.8 -6.2	5.2 -1.8	99.9 -0.1	close	Xmax 5.2 mm < 7 mm: lower excursion-limited SPL	+
B&C 12 NDL 76	50 =	0.2 =	73 =	4.3 -2.7	100.1 +0.1	close	Xmax 4.3 mm < 7 mm: lower excursion-limited SPL	+
Beyma 12"P80/Fe V2	48 -2	0.21 +0.01	61 -12	7.5 +0.5	99 -1	close		+
Oberton 12NXL400	48.6 -1.4	0.203 =	79.24 +6.24	5.25 -1.75	101 +1	close	Xmax 5.25 mm < 7 mm: lower excursion-limited SPL	+
Beyma 12P80/Fe	46 -4	0.186 -0.01	75.6 +2.6	5.6 -1.4	99.8 -0.2	close	Xmax 5.6 mm < 7 mm: lower excursion-limited SPL	+
Oberton 12B450	46.29 -3.71	0.235 +0.03	71.75 -1.25	7.75 +0.75	99 -1	close		+

Compare the closest 3 against the 12NDL76 →

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 (1)

12"+1" 2-Way Toptopbass reflex