18 Sound 6NMB900
Thiele-Small parameters
| Nominal size | 6.5" |
|---|---|
| Impedance | 8 Ω |
| Fs | 95 Hz |
| Qts | 0.32 |
| Qes | 0.36 |
| Qms | 2.87 |
| Vas | 10.3 L |
| Sd | 130 cm² |
| Xmax | 3 mm |
| Re | 5.2 Ω |
| Bl | 8.5 T·m |
| Mms | 7.4 g |
| Pe | 200 W |
| Sensitivity | 97 dB |
Alignment hint
| EBP | 264 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 2.7 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 6NMB900 | 100 +5 | 0.34 +0.02 | 6.65 -3.65 | 3 = | 96 -1 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| Beyma 6CMV2 | 90 -5 | 0.34 +0.02 | 6.5 -3.8 | 5.7 +2.7 | 94 -3 | usable | + | |
| 18 Sound 6NMB420 | 110 +15 | 0.33 +0.01 | 6.1 -4.2 | 3 = | 100 +3 | usable | + | |
| B&C 6PS38 | 75 -20 | 0.3 -0.02 | 8 -2.3 | 6 +3 | 94 -3 | usable | 150 W vs 200 W: lower power handling | + |
| 18 Sound 6ND430 | 66 -29 | 0.3 -0.02 | 12.6 +2.3 | 5 +2 | 94 -3 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| Beyma 6P200Fe | 66 -29 | 0.35 +0.03 | 8.8 -1.5 | 4 +1 | 93 -4 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| B&C 6PS44 | 71 -24 | 0.33 +0.01 | 7 -3.3 | 4.5 +1.5 | 93 -4 | usable | + | |
| B&C 6CLA51 | 96 +1 | 0.32 = | 4.3 -6 | 4.8 +1.8 | 94.5 -2.5 | usable | + | |
| Oberton 6NB150 | 62.32 -32.68 | 0.28 -0.04 | 9.3 -1 | 5.5 +2.5 | 92 -5 | usable | 150 W vs 200 W: lower power handling | + |
| 18 Sound 6NMB420 | 112 +17 | 0.4 +0.08 | 5.9 -4.4 | 3 = | 100 +3 | usable | 16 Ω vs 8 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.