B&C 21SW115
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 4 Ω |
| Fs | 33 Hz |
| Qts | 0.36 |
| Qes | 0.37 |
| Qms | 7.7 |
| Vas | 278 L |
| Sd | 1680 cm² |
| Xmax | 14 mm |
| Re | 3.6 Ω |
| Bl | 24.8 T·m |
| Mms | 335 g |
| Pe | 1700 W |
| Sensitivity | 97 dB |
Alignment hint
| EBP | 89 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 97.3 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 -2 | 0.36 = | 270 -8 | 17.5 +3.5 | 97 = | close | 8 Ω vs 4 Ω: amp load changes | + |
| Fane Colossus Prime 21NDXL | 33 = | 0.36 = | 241 -37 | 14 = | 98 +1 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Fane Colossus Prime 21XS | 35 +2 | 0.339 -0.02 | 266 -12 | 14 = | 97.5 +0.5 | close | 8 Ω vs 4 Ω: amp load changes | + |
| B&C 21SW115 | 30 -3 | 0.37 +0.01 | 318 +40 | 14 = | 97 = | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW9001 | 31 -2 | 0.34 -0.02 | 272 -6 | 14 = | 95 -2 | close | + | |
| 18 Sound 21NTLW5000 | 30 -3 | 0.32 -0.04 | 300 +22 | 17.5 +3.5 | 97 = | close | + | |
| B&C 21SW152 | 32 -1 | 0.36 = | 200 -78 | 15 +1 | 96 -1 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW4100 | 34 +1 | 0.4 +0.04 | 219 -59 | 15.2 +1.2 | 97 = | close | + | |
| 18 Sound 21NLW9001 | 32 -1 | 0.31 -0.05 | 244 -34 | 14 = | 98 +1 | close | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 21NLW5300 | 31 -2 | 0.32 -0.04 | 325 +47 | 15.3 +1.3 | 98.5 +1.5 | close | 8 Ω vs 4 Ω: amp load changes | + |
Compare the closest 3 against the 21SW115 →
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.