18 Sound 12NMB420
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 53 Hz |
| Qts | 0.28 |
| Qes | 0.3 |
| Qms | 3.6 |
| Vas | 105 L |
| Sd | 531 cm² |
| Xmax | 4 mm |
| Re | 5.2 Ω |
| Bl | 13.9 T·m |
| Mms | 33.5 g |
| Pe | 300 W |
| Sensitivity | 100.5 dB |
Alignment hint
| EBP | 177 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 19.5 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 12NDA520 | 50 -3 | 0.27 -0.01 | 111 +6 | 4 = | 100.5 = | close | + | |
| Eighteen Sound 12ND520 | 50 -3 | 0.27 -0.01 | 111 +6 | 4 = | 98.7 -1.8 | close | + | |
| 18 Sound 12ND710 | 53 = | 0.29 +0.01 | 85 -20 | 5 +1 | 101 +0.5 | close | 16 Ω vs 8 Ω: amp load changes | + |
| P.Audio SN-12MB | 50 -3 | 0.296 +0.02 | 95.3 -9.7 | 5 +1 | 99.3 -1.2 | close | + | |
| B&C 12 HPL 64-4 | 50 -3 | 0.296 +0.02 | 85 -20 | 4 = | 100.4 -0.1 | close | 4 Ω vs 8 Ω: amp load changes · 200 W vs 300 W: lower power handling | + |
| PHL Audio 4550 | 45 -8 | 0.289 +0.01 | 106 +1 | 4 = | 98.3 -2.2 | close | + | |
| B&C 12 CX 32 | 57 +4 | 0.284 = | 79 -26 | 4 = | 100.8 +0.3 | close | + | |
| 18 Sound 12MB700 | 46 -7 | 0.25 -0.03 | 100 -5 | 4.5 +0.5 | 100.5 = | close | 16 Ω vs 8 Ω: amp load changes | + |
| B&C 12 HPL 64-4 v2015 | 50 -3 | 0.321 +0.04 | 92.3 -12.7 | 4 = | 101 +0.5 | close | 4 Ω vs 8 Ω: amp load changes · 200 W vs 300 W: lower power handling | + |
| B&C 12 PL 32 | 49 -4 | 0.249 -0.03 | 97 -8 | 3.5 -0.5 | 100.2 -0.3 | close | Xmax 3.5 mm < 4 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the 12NMB420 →
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.