18 Sound 21LW1400
Thiele-Small parameters
| Nominal size | 21" |
|---|---|
| Impedance | 8 Ω |
| Fs | 28 Hz |
| Qts | 0.24 |
| Qes | 0.24 |
| Qms | 9.32 |
| Vas | 385 L |
| Sd | 1660 cm² |
| Xmax | 9.5 mm |
| Re | 5 Ω |
| Bl | 33.5 T·m |
| Mms | 296 g |
| Pe | 1000 W |
| Sensitivity | 99 dB |
Alignment hint
| EBP | 117 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 50.1 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 |
|---|---|---|---|---|---|---|---|---|
| RCF LF21N451 | 30 +2 | 0.26 +0.02 | 375 -10 | 13 +3.5 | 98.5 -0.5 | close | + | |
| Faital PRO 21XL3000 | 30 +2 | 0.25 +0.01 | 284.6 -100.4 | 17.67 +8.17 | 98 -1 | usable | + | |
| Beyma 21QLEX1600Fe | 30 +2 | 0.28 +0.04 | 309 -76 | 13 +3.5 | 98 -1 | usable | + | |
| Celestion NTR21-5010JD | 30.2 +2.2 | 0.291 +0.05 | 341.215 -43.79 | 9 -0.5 | 96.7 -2.3 | usable | Xmax 9 mm < 9.5 mm: lower excursion-limited SPL | + |
| Beyma 21"LEX1600/Nd | 30 +2 | 0.29 +0.05 | 305 -80 | 14 +4.5 | 98 -1 | usable | + | |
| RCF LF21X451 | 28 = | 0.37 +0.13 | 385 = | 14 +4.5 | 97 -2 | usable | + | |
| 18 Sound 21NLW5300 | 31 +3 | 0.32 +0.08 | 325 -60 | 15.3 +5.8 | 98.5 -0.5 | usable | + | |
| RCF LF21N401 | 30 +2 | 0.37 +0.13 | 374 -11 | 11 +1.5 | 98 -1 | usable | + | |
| 18 Sound 21LW2600 | 27 -1 | 0.33 +0.09 | 333 -52 | 14.6 +5.1 | 97 -2 | usable | + | |
| 18 Sound 21NTLW5000 | 30 +2 | 0.32 +0.08 | 300 -85 | 17.5 +8 | 97 -2 | usable | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the 21LW1400 →
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.