RCF LF21N401
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 8 Ω |
| Fs | 30 Hz |
| Qts | 0.37 |
| Qes | 0.4 |
| Qms | 6.8 |
| Vas | 374 L |
| Sd | 1730 cm² |
| Xmax | 11 mm |
| Re | 5 Ω |
| Bl | 27.6 T·m |
| Mms | 318 g |
| Pe | 1500 W |
| Sensitivity | 98 dB |
Alignment hint
| EBP | 75 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 141 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 |
|---|---|---|---|---|---|---|---|---|
| RCF LF21X451 | 28 -2 | 0.37 = | 385 +11 | 14 +3 | 97 -1 | close | + | |
| B&C 21SW115 | 30 = | 0.37 = | 318 -56 | 14 +3 | 97 -1 | close | + | |
| 18 Sound 21NLW5300 | 31 +1 | 0.32 -0.05 | 325 -49 | 15.3 +4.3 | 98.5 +0.5 | close | + | |
| 18 Sound 21LW2600 | 27 -3 | 0.33 -0.04 | 333 -41 | 14.6 +3.6 | 97 -1 | usable | + | |
| 18 Sound 21NTLW5000 | 31 +1 | 0.36 -0.01 | 270 -104 | 17.5 +6.5 | 97 -1 | usable | + | |
| B&C 21SW115 | 33 +3 | 0.36 -0.01 | 278 -96 | 14 +3 | 97 -1 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| 18 Sound 21NTLW5000 | 30 = | 0.32 -0.05 | 300 -74 | 17.5 +6.5 | 97 -1 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| RCF LF21N451 | 30 = | 0.26 -0.11 | 375 +1 | 13 +2 | 98.5 +0.5 | usable | + | |
| Beyma 21"LEX1600/Nd | 30 = | 0.29 -0.08 | 305 -69 | 14 +3 | 98 = | usable | + | |
| Beyma 21QLEX1600Fe | 30 = | 0.28 -0.09 | 309 -65 | 13 +2 | 98 = | usable | + |
Compare the closest 3 against the LF21N401 →
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.