Oberton 8NMB250v4

8" · 8 Ω · 250 W · 96 dB · datasheet ↗

Thiele-Small parameters

Nominal size	8"
Impedance	8 Ω
Fs	82.03 Hz
Qts	0.258
Qes	0.269
Qms	6.379
Vas	10.89 L
Sd	202 cm²
Xmax	4.5 mm
Re	5.5 Ω
Bl	14.26 T·m
Mms	19.32 g
Pe	250 W
Sensitivity	96 dB

Alignment hint

EBP	305 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 1.7 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
18 Sound 8NTLW2000	74 -8.03	0.26 =	11.3 +0.41	4.4 -0.1	96.5 +0.5	close	16 Ω vs 8 Ω: amp load changes · Xmax 4.4 mm < 4.5 mm: lower excursion-limited SPL	+
B&C 8NDL64	80 -2.03	0.25 -0.01	9.6 -1.29	4.5 =	97 +1	close		+
B&C 8NW51	76 -6.03	0.25 -0.01	10.6 -0.29	6 +1.5	97 +1	close	4 Ω vs 8 Ω: amp load changes	+
B&C 8NDL64	73 -9.03	0.24 -0.02	11.8 +0.91	4.5 =	97 +1	close	16 Ω vs 8 Ω: amp load changes	+
BMS 8N515	87.7 +5.67	0.3 +0.04	11.04 +0.15	4 -0.5	96 =	close	Xmax 4 mm < 4.5 mm: lower excursion-limited SPL	+
BMS 8S215	87.7 +5.67	0.31 +0.05	11.04 +0.15	4.25 -0.25	96 =	close	Xmax 4.25 mm < 4.5 mm: lower excursion-limited SPL	+
B&C 8CLA64	71 -11.03	0.24 -0.02	12.5 +1.61	5.3 +0.8	96 =	close		+
Sica 8 K 3 PL	68.1 -13.93	0.25 -0.01	12.2 +1.31	5 +0.5	95.1 -0.9	close		+
LaVoce WAN082.02	80 -2.03	0.23 -0.03	8.97 -1.92	5.8 +1.3	96.5 +0.5	close		+
Oberton 8NB201	70.56 -11.47	0.245 -0.01	12.54 +1.65	5.25 +0.75	95 -1	close		+

Compare the closest 3 against the 8NMB250v4 →

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.