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18 Sound 6NMB420

6.5" · 8 Ω · 200 W · 100 dB · datasheet ↗

Thiele-Small parameters

Nominal size6.5"
Impedance8 Ω
Fs110 Hz
Qts0.33
Qes0.38
Qms2.7
Vas6.1 L
Sd130 cm²
Xmax3 mm
Re5.3 Ω
Bl9 T·m
Mms8.5 g
Pe200 W
Sensitivity100 dB

Alignment hint

EBP289 · 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
18 Sound 6NMB420112 +20.4 +0.075.9 -0.23 =100 =close16 Ω vs 8 Ω: amp load changes+
18 Sound 6NMB900100 -100.34 +0.016.65 +0.553 =96 -4close16 Ω vs 8 Ω: amp load changes+
B&C 6PEV13126 +160.36 +0.036 -0.12.5 -0.599 -1close120 W vs 200 W: lower power handling · Xmax 2.5 mm < 3 mm: lower excursion-limited SPL+
B&C 6MBX44113 +30.31 -0.024.1 -23.5 +0.598 -2usable+
B&C 6MBX44115 +50.35 +0.024 -2.13.5 +0.598 -2usable16 Ω vs 8 Ω: amp load changes+
Beyma 6CMV290 -200.34 +0.016.5 +0.45.7 +2.794 -6usable+
18 Sound 6NMB90095 -150.32 -0.0110.3 +4.23 =97 -3usable+
B&C 6CLA5196 -140.32 -0.014.3 -1.84.8 +1.894.5 -5.5usable+
Oberton 6M150115.1 +5.10.422 +0.095.35 -0.752.25 -0.7596 -4usable150 W vs 200 W: lower power handling · Xmax 2.25 mm < 3 mm: lower excursion-limited SPL+
18 Sound 6ND410120 +100.24 -0.096.2 +0.12 -1102 +2usableXmax 2 mm < 3 mm: lower excursion-limited SPL+

Compare the closest 3 against the 6NMB420 →

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 (9)