Eighteen Sound 12ND520
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 50 Hz |
| Qts | 0.27 |
| Qes | 0.284 |
| Qms | 5.5 |
| Vas | 111 L |
| Sd | 528 cm² |
| Xmax | 4 mm |
| Re | 5.2 Ω |
| Bl | 14.4 T·m |
| Mms | 36 g |
| Pe | 300 W |
| Sensitivity | 98.7 dB |
Alignment hint
| EBP | 176 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 18.9 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 = | 0.27 = | 111 = | 4 = | 100.5 +1.8 | close | + | |
| 18 Sound 12NMB420 | 53 +3 | 0.28 +0.01 | 105 -6 | 4 = | 100.5 +1.8 | close | + | |
| PHL Audio 4550 | 45 -5 | 0.289 +0.02 | 106 -5 | 4 = | 98.3 -0.4 | close | + | |
| Beyma SM112 | 45 -5 | 0.262 -0.01 | 101 -10 | 4.8 +0.8 | 98.3 -0.4 | close | + | |
| Beyma 12CXA400Nd | 45 -5 | 0.268 = | 102.2 -8.8 | 6 +2 | 98 -0.7 | close | + | |
| Eminence KAPPA-12A | 45 -5 | 0.27 = | 112.1 +1.1 | 3.2 -0.8 | 99.3 +0.6 | close | Xmax 3.2 mm < 4 mm: lower excursion-limited SPL | + |
| Eminence KAPPA 12 | 45 -5 | 0.27 = | 112.1 +1.1 | 3.2 -0.8 | 99.3 +0.6 | close | Xmax 3.2 mm < 4 mm: lower excursion-limited SPL | + |
| Eminence KAPPA 12 A | 45 -5 | 0.27 = | 112.1 +1.1 | 3.2 -0.8 | 99.3 +0.6 | close | Xmax 3.2 mm < 4 mm: lower excursion-limited SPL | + |
| SB Audience 12MW300 | 43 -7 | 0.264 -0.01 | 104 -7 | 5.6 +1.6 | 98.7 = | close | + | |
| PHL Audio 4500 | 42 -8 | 0.274 = | 108 -3 | 5.7 +1.7 | 99 +0.3 | close | + |
Compare the closest 3 against the 12ND520 →
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.