RCF LF18X400
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 28 Hz |
| Qts | 0.27 |
| Qes | 0.29 |
| Qms | 6.5 |
| Vas | 340 L |
| Sd | 1200 cm² |
| Xmax | 9 mm |
| Re | 5.1 Ω |
| Bl | 25 T·m |
| Mms | 192 g |
| Pe | 1000 W |
| Sensitivity | 97.5 dB |
Alignment hint
| EBP | 97 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 58 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 LF18G400 | 28 = | 0.27 = | 360 +20 | 9 = | 97.5 = | close | + | |
| RCF LF 18X400 v2 | 28 = | 0.278 +0.01 | 340 = | 9 = | 98 +0.5 | close | + | |
| RCF LF 18G400 | 28 = | 0.273 = | 360 +20 | 9 = | 98.3 +0.8 | close | + | |
| RCF L 18P400 | 29 +1 | 0.279 +0.01 | 340 = | 8.8 -0.2 | 98.5 +1 | close | Xmax 8.8 mm < 9 mm: lower excursion-limited SPL | + |
| RCF LF 18X400 | 28 = | 0.255 -0.02 | 360 +20 | 9 = | 98.6 +1.1 | close | + | |
| 18 Sound 18ND9300 | 30 +2 | 0.28 +0.01 | 322 -18 | 9.5 +0.5 | 98.8 +1.3 | close | + | |
| RCF L 18P200N | 28 = | 0.306 +0.04 | 363 +23 | 9.8 +0.8 | 97 -0.5 | close | + | |
| Faital PRO 18FH510 | 30 +2 | 0.26 -0.01 | 391.4 +51.4 | 9.45 +0.45 | 98 +0.5 | close | 4 Ω vs 8 Ω: amp load changes · 600 W vs 1000 W: lower power handling | + |
| RCF L 18P200N vp tlhp | 28 = | 0.306 +0.04 | 380 +40 | 9.8 +0.8 | 97.2 -0.3 | close | + | |
| Celestion FTR18-4080HD | 26 -2 | 0.272 = | 395.6 +55.6 | 8 -1 | 97.5 = | close | Xmax 8 mm < 9 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the LF18X400 →
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.