B&C 21 SW 115
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 4 Ω |
| Fs | 32.5 Hz |
| Qts | 0.404 |
| Qes | 0.42 |
| Qms | 10.3 |
| Vas | 268.7 L |
| Sd | 1680 cm² |
| Xmax | 9.9 mm |
| Re | 3.31 Ω |
| Bl | 23.9 T·m |
| Mms | 354 g |
| Pe | 1700 W |
| Sensitivity | 99.2 dB |
Alignment hint
| EBP | 77 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 130.2 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 |
|---|---|---|---|---|---|---|---|---|
| Beyma 21SW1600ND | 33 +0.5 | 0.382 -0.02 | 268 -0.7 | 8.9 -1 | 97.6 -1.6 | close | 8 Ω vs 4 Ω: amp load changes · Xmax 8.9 mm < 9.9 mm: lower excursion-limited SPL | + |
| B&C 21 SW 115 v2015 | 33 +0.5 | 0.353 -0.05 | 278 +9.3 | 9.3 -0.6 | 100.6 +1.4 | close | Xmax 9.3 mm < 9.9 mm: lower excursion-limited SPL | + |
| LaVoce SAF214.50 vp | 30 -2.5 | 0.401 = | 311 +42.3 | 11.6 +1.7 | 96.4 -2.8 | close | 8 Ω vs 4 Ω: amp load changes | + |
| LaVoce SAF214.50 | 30 -2.5 | 0.435 +0.03 | 267 -1.7 | 11.6 +1.7 | 95.6 -3.6 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Ciare NDC 21-5 | 32.2 -0.3 | 0.344 -0.06 | 270.8 +2.1 | 8.8 -1.1 | 97.2 -2 | close | 8 Ω vs 4 Ω: amp load changes · Xmax 8.8 mm < 9.9 mm: lower excursion-limited SPL | + |
| Beyma 21L50 | 33 +0.5 | 0.434 +0.03 | 300 +31.3 | 7.9 -2 | 97 -2.2 | usable | 8 Ω vs 4 Ω: amp load changes · 1000 W vs 1700 W: lower power handling · Xmax 7.9 mm < 9.9 mm: lower excursion-limited SPL | + |
| RCF LF 21N401 | 30 -2.5 | 0.378 -0.03 | 374 +105.3 | 10.6 +0.7 | 98 -1.2 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| SB Audience NERO-21SW1100D | 32 -0.5 | 0.339 -0.06 | 312.6 +43.9 | 8.1 -1.8 | 98.6 -0.6 | usable | 8 Ω vs 4 Ω: amp load changes · 1100 W vs 1700 W: lower power handling · Xmax 8.1 mm < 9.9 mm: lower excursion-limited SPL | + |
| MC Kenzie FRL-21/1200-LF | 30 -2.5 | 0.378 -0.03 | 374 +105.3 | 9.5 -0.4 | 98 -1.2 | usable | 8 Ω vs 4 Ω: amp load changes · 1200 W vs 1700 W: lower power handling · Xmax 9.5 mm < 9.9 mm: lower excursion-limited SPL | + |
| 18 Sound 21NLW9000 | 29 -3.5 | 0.347 -0.06 | 304 +35.3 | 10.7 +0.8 | 96.4 -2.8 | usable | 8 Ω vs 4 Ω: amp load changes | + |
Compare the closest 3 against the 21 SW 115 →
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.