18 Sound 21NLW9601C
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 4 Ω |
| Fs | 38 Hz |
| Qts | 0.29 |
| Qes | 0.31 |
| Qms | 6.28 |
| Vas | 140 L |
| Sd | 1662 cm² |
| Xmax | 14 mm |
| Re | 2.9 Ω |
| Bl | 33.2 T·m |
| Mms | 460 g |
| Pe | 1800 W |
| Sensitivity | 94.5 dB |
Alignment hint
| EBP | 123 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 28.3 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 21iD | 38 = | 0.23 -0.06 | 143 +3 | 14 = | 94.2 -0.3 | close | 2 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW9601 | 37 -1 | 0.29 = | 175 +35 | 14 = | 98 +3.5 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW9601 | 41 +3 | 0.32 +0.03 | 123 -17 | 14 = | 98 +3.5 | usable | + | |
| B&C 21SW152 | 32 -6 | 0.3 +0.01 | 200 +60 | 15 +1 | 96 +1.5 | usable | + | |
| Lavoce SAN215.30 | 35 -3 | 0.33 +0.04 | 200 +60 | 14.9 +0.9 | 95.7 +1.2 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| RCF LF21N551 | 35 -3 | 0.33 +0.04 | 200 +60 | 15 +1 | 97 +2.5 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21DS115 | 34 -4 | 0.27 -0.02 | 204 +64 | 16.5 +2.5 | 99 +4.5 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21IPAL | 37 -1 | 0.21 -0.08 | 155 +15 | 22 +8 | 99 +4.5 | usable | 1 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW152 | 32 -6 | 0.36 +0.07 | 200 +60 | 15 +1 | 96 +1.5 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW9001 | 32 -6 | 0.31 +0.02 | 244 +104 | 14 = | 98 +3.5 | usable | 8 Ω vs 4 Ω: amp load changes | + |
Compare the closest 3 against the 21NLW9601C →
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.