18 Sound 21NLW9001
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 4 Ω |
| Fs | 31 Hz |
| Qts | 0.34 |
| Qes | 0.37 |
| Qms | 4.54 |
| Vas | 272 L |
| Sd | 1662 cm² |
| Xmax | 14 mm |
| Re | 2.9 Ω |
| Bl | 23.8 T·m |
| Mms | 375 g |
| Pe | 1800 W |
| Sensitivity | 95 dB |
Alignment hint
| EBP | 84 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 81.8 L |
EBP 50-100: works in either a sealed or ported 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 21NTLW5000 | 31 = | 0.36 +0.02 | 270 -2 | 17.5 +3.5 | 97 +2 | close | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW115 | 33 +2 | 0.36 +0.02 | 278 +6 | 14 = | 97 +2 | close | + | |
| Fane Colossus Prime 21XS | 35 +4 | 0.339 = | 266 -6 | 14 = | 97.5 +2.5 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NTLW5000 | 30 -1 | 0.32 -0.02 | 300 +28 | 17.5 +3.5 | 97 +2 | close | + | |
| B&C 21SW115 | 30 -1 | 0.37 +0.03 | 318 +46 | 14 = | 97 +2 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Fane Colossus Prime 21NDXL | 33 +2 | 0.36 +0.02 | 241 -31 | 14 = | 98 +3 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW9001 | 32 +1 | 0.31 -0.03 | 244 -28 | 14 = | 98 +3 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW5300 | 31 = | 0.32 -0.02 | 325 +53 | 15.3 +1.3 | 98.5 +3.5 | close | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW152 | 32 +1 | 0.36 +0.02 | 200 -72 | 15 +1 | 96 +1 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21LW2600 | 27 -4 | 0.33 -0.01 | 333 +61 | 14.6 +0.6 | 97 +2 | usable | 8 Ω vs 4 Ω: amp load changes | + |
Compare the closest 3 against the 21NLW9001 →
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.