18 Sound 6NMB900

6.5" · 16 Ω · 200 W · 96 dB · datasheet ↗

Thiele-Small parameters

Nominal size	6.5"
Impedance	16 Ω
Fs	100 Hz
Qts	0.34
Qes	0.38
Qms	3.1
Vas	6.65 L
Sd	130 cm²
Xmax	3 mm
Re	10.1 Ω
Bl	12.4 T·m
Mms	9 g
Pe	200 W
Sensitivity	96 dB

Alignment hint

EBP	263 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 2 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
Beyma 6CMV2	90 -10	0.34 =	6.5 -0.15	5.7 +2.7	94 -2	close	8 Ω vs 16 Ω: amp load changes	+
18 Sound 6NMB420	110 +10	0.33 -0.01	6.1 -0.55	3 =	100 +4	close	8 Ω vs 16 Ω: amp load changes	+
18 Sound 6NMB900	95 -5	0.32 -0.02	10.3 +3.65	3 =	97 +1	usable	8 Ω vs 16 Ω: amp load changes	+
18 Sound 6NMB420	112 +12	0.4 +0.06	5.9 -0.75	3 =	100 +4	usable		+
B&C 6CLA51	96 -4	0.32 -0.02	4.3 -2.35	4.8 +1.8	94.5 -1.5	usable	8 Ω vs 16 Ω: amp load changes	+
B&C 6PS44	71 -29	0.33 -0.01	7 +0.35	4.5 +1.5	93 -3	usable	8 Ω vs 16 Ω: amp load changes	+
B&C 6PEV13	126 +26	0.36 +0.02	6 -0.65	2.5 -0.5	99 +3	usable	8 Ω vs 16 Ω: amp load changes · 120 W vs 200 W: lower power handling · Xmax 2.5 mm < 3 mm: lower excursion-limited SPL	+
B&C 6CLA51	89 -11	0.41 +0.07	5.7 -0.95	5.5 +2.5	93.5 -2.5	usable		+
18 Sound 6NTLW2000	86 -14	0.35 +0.01	4.6 -2.05	4.9 +1.9	93 -3	usable	8 Ω vs 16 Ω: amp load changes	+
Beyma 6G40Nd/N	100 =	0.38 +0.04	3.7 -2.95	3 =	94 -2	usable	8 Ω vs 16 Ω: amp load changes	+

Compare the closest 3 against the 6NMB900 →

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.