RCF LF18X451
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 30 Hz |
| Qts | 0.28 |
| Qes | 0.29 |
| Qms | 6.7 |
| Vas | 220 L |
| Sd | 1200 cm² |
| Xmax | 14 mm |
| Re | 5.4 Ω |
| Bl | 30.5 T·m |
| Mms | 260 g |
| Pe | 1800 W |
| Sensitivity | 97 dB |
Alignment hint
| EBP | 103 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 40.9 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 |
|---|---|---|---|---|---|---|---|---|
| Faital PRO 18XL1700 | 28 -2 | 0.28 = | 227 +7 | 16.17 +2.17 | 97 = | close | + | |
| 18 Sound 18NLW4100 | 29 -1 | 0.27 -0.01 | 207 -13 | 15 +1 | 97 = | close | 4 Ω vs 8 Ω: amp load changes | + |
| 18 Sound 18LW2600 | 30 = | 0.28 = | 186 -34 | 14 = | 96.5 -0.5 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Faital PRO 18XL2000 | 28 -2 | 0.27 -0.01 | 232.1 +12.1 | 16.32 +2.32 | 97 = | close | + | |
| RCF LF 18X451 | 30 = | 0.278 = | 220 = | 10.7 -3.3 | 96.8 -0.2 | close | Xmax 10.7 mm < 14 mm: lower excursion-limited SPL | + |
| RCF LF18N405 | 30 = | 0.32 +0.04 | 227 +7 | 14 = | 97 = | close | + | |
| 18 Sound 18LW2600 | 31 +1 | 0.29 +0.01 | 187 -33 | 14.8 +0.8 | 96.8 -0.2 | close | + | |
| B&C 18SW115 | 32 +2 | 0.3 +0.02 | 187 -33 | 14 = | 97 = | close | + | |
| 18 Sound 18NLW9000 | 34 +4 | 0.31 +0.03 | 206 -14 | 14 = | 97 = | close | + | |
| RCF LF18N408 | 30 = | 0.33 +0.05 | 193 -27 | 15 +1 | 97 = | close | + |
Compare the closest 3 against the LF18X451 →
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 (2)
- FAKE TH118subtapped horn
- HSR FAITH118subbass reflex