18 Sound 21NLW4100
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 4 Ω |
| Fs | 34 Hz |
| Qts | 0.4 |
| Qes | 0.42 |
| Qms | 7.8 |
| Vas | 219 L |
| Sd | 1661 cm² |
| Xmax | 15.2 mm |
| Re | 2.6 Ω |
| Bl | 22.8 T·m |
| Mms | 400 g |
| Pe | 1500 W |
| Sensitivity | 97 dB |
Alignment hint
| EBP | 81 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 103.1 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 21NLW4100 | 36 +2 | 0.46 +0.06 | 210 -9 | 15.2 = | 97 = | close | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW152 | 32 -2 | 0.36 -0.04 | 200 -19 | 15 -0.2 | 96 -1 | close | 8 Ω vs 4 Ω: amp load changes · Xmax 15 mm < 15.2 mm: lower excursion-limited SPL | + |
| Fane Colossus Prime 21NDXL | 33 -1 | 0.36 -0.04 | 241 +22 | 14 -1.2 | 98 +1 | close | 8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15.2 mm: lower excursion-limited SPL | + |
| RCF LF21N551 | 35 +1 | 0.33 -0.07 | 200 -19 | 15 -0.2 | 97 = | close | 8 Ω vs 4 Ω: amp load changes · Xmax 15 mm < 15.2 mm: lower excursion-limited SPL | + |
| B&C 21SW115 | 33 -1 | 0.36 -0.04 | 278 +59 | 14 -1.2 | 97 = | close | Xmax 14 mm < 15.2 mm: lower excursion-limited SPL | + |
| Lavoce SAN215.30 | 35 +1 | 0.33 -0.07 | 200 -19 | 14.9 -0.3 | 95.7 -1.3 | close | 8 Ω vs 4 Ω: amp load changes · Xmax 14.9 mm < 15.2 mm: lower excursion-limited SPL | + |
| 18 Sound 21NTLW5000 | 31 -3 | 0.36 -0.04 | 270 +51 | 17.5 +2.3 | 97 = | close | 8 Ω vs 4 Ω: amp load changes | + |
| Fane Colossus Prime 21XS | 35 +1 | 0.339 -0.06 | 266 +47 | 14 -1.2 | 97.5 +0.5 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 14 mm < 15.2 mm: lower excursion-limited SPL | + |
| 18 Sound 21LW2600 | 27 -7 | 0.37 -0.03 | 190 -29 | 14.6 -0.6 | 97 = | usable | Xmax 14.6 mm < 15.2 mm: lower excursion-limited SPL | + |
| B&C 21SW152 | 32 -2 | 0.3 -0.1 | 200 -19 | 15 -0.2 | 96 -1 | usable | Xmax 15 mm < 15.2 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the 21NLW4100 →
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.