18 Sound 21NLW9601
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 4 Ω |
| Fs | 41 Hz |
| Qts | 0.32 |
| Qes | 0.33 |
| Qms | 10.56 |
| Vas | 123 L |
| Sd | 1662 cm² |
| Xmax | 14 mm |
| Re | 3 Ω |
| Bl | 32.7 T·m |
| Mms | 450 g |
| Pe | 1800 W |
| Sensitivity | 98 dB |
Alignment hint
| EBP | 124 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 31.7 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 21NLW9601C | 38 -3 | 0.29 -0.03 | 140 +17 | 14 = | 94.5 -3.5 | usable | + | |
| 18 Sound 21NLW9601 | 37 -4 | 0.29 -0.03 | 175 +52 | 14 = | 98 = | usable | 8 Ω vs 4 Ω: amp load changes | + |
| RCF LF21N551 | 35 -6 | 0.33 +0.01 | 200 +77 | 15 +1 | 97 -1 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| Lavoce SAN215.30 | 35 -6 | 0.33 +0.01 | 200 +77 | 14.9 +0.9 | 95.7 -2.3 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21iD | 38 -3 | 0.23 -0.09 | 143 +20 | 14 = | 94.2 -3.8 | usable | 2 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW152 | 32 -9 | 0.3 -0.02 | 200 +77 | 15 +1 | 96 -2 | usable | + | |
| 18 Sound 21NLW9001 | 32 -9 | 0.31 -0.01 | 244 +121 | 14 = | 98 = | usable | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21DS115 | 34 -7 | 0.27 -0.05 | 204 +81 | 16.5 +2.5 | 99 +1 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| Fane Colossus Prime 21XS | 35 -6 | 0.339 +0.02 | 266 +143 | 14 = | 97.5 -0.5 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW152 | 32 -9 | 0.36 +0.04 | 200 +77 | 15 +1 | 96 -2 | usable | 8 Ω vs 4 Ω: amp load changes | + |
Compare the closest 3 against the 21NLW9601 →
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.