RCF LF 18P400
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 39.5 Hz |
| Qts | 0.391 |
| Qes | 0.407 |
| Qms | 10.2 |
| Vas | 201 L |
| Sd | 1241 cm² |
| Xmax | 8 mm |
| Re | 4.87 Ω |
| Bl | 22.8 T·m |
| Mms | 174.4 g |
| Pe | 1000 W |
| Sensitivity | 99 dB |
Alignment hint
| EBP | 97 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 88.5 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 |
|---|---|---|---|---|---|---|---|---|
| Faital PRO 18HP1042 | 38 -1.5 | 0.41 +0.02 | 191.9 -9.1 | 9 +1 | 98 -1 | close | + | |
| Sica 18 S 4 PL | 36.2 -3.3 | 0.39 = | 189 -12 | 8 = | 97.3 -1.7 | close | + | |
| B&C 18 TBX 100 (prodance) | 36.6 -2.9 | 0.406 +0.02 | 198 -3 | 9 +1 | 97.4 -1.6 | close | + | |
| Beyma 18G550 | 36 -3.5 | 0.374 -0.02 | 210 +9 | 8.1 +0.1 | 97.8 -1.2 | close | + | |
| Beyma 18G550 v2015 | 36 -3.5 | 0.374 -0.02 | 210 +9 | 8.1 +0.1 | 97.8 -1.2 | close | + | |
| Beyma 18P1000Nd | 40 +0.5 | 0.412 +0.02 | 178 -23 | 7.6 -0.4 | 98.2 -0.8 | close | Xmax 7.6 mm < 8 mm: lower excursion-limited SPL | + |
| Beyma 18LEX1600/ND-8 | 35 -4.5 | 0.39 = | 205 +4 | 10.4 +2.4 | 96.8 -2.2 | close | + | |
| Beyma 18G50 vp | 39 -0.5 | 0.365 -0.03 | 204.9 +3.9 | 6.4 -1.6 | 98.1 -0.9 | close | 750 W vs 1000 W: lower power handling · Xmax 6.4 mm < 8 mm: lower excursion-limited SPL | + |
| P.Audio FL-18ELF | 36 -3.5 | 0.39 = | 209.8 +8.8 | 8 = | 95.6 -3.4 | close | + | |
| Beyma 18P1200Nd | 37 -2.5 | 0.339 -0.05 | 198 -3 | 8.4 +0.4 | 98.3 -0.7 | close | + |
Compare the closest 3 against the LF 18P400 →
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.