RCF L 18/851KN
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 39 Hz |
| Qts | 0.357 |
| Qes | 0.38 |
| Qms | 6 |
| Vas | 200 L |
| Sd | 1041 cm² |
| Xmax | 5 mm |
| Re | 5.7 Ω |
| Bl | 21.6 T·m |
| Mms | 126.5 g |
| Pe | 500 W |
| Sensitivity | 98.4 dB |
Alignment hint
| EBP | 103 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 68.4 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 |
|---|---|---|---|---|---|---|---|---|
| Beyma 18G50 vp | 39 = | 0.365 +0.01 | 204.9 +4.9 | 6.4 +1.4 | 98.1 -0.3 | close | + | |
| PD PDN 18SB40 | 38.5 -0.5 | 0.326 -0.03 | 201.3 +1.3 | 6 +1 | 98.6 +0.2 | close | + | |
| Precision Devices PDN 18SB40 | 38.5 -0.5 | 0.326 -0.03 | 201.3 +1.3 | 6 +1 | 98.6 +0.2 | close | + | |
| Beyma 18GT400 | 40 +1 | 0.383 +0.03 | 185 -15 | 5.3 +0.3 | 98.3 -0.1 | close | + | |
| RCF W470 | 36 -3 | 0.35 -0.01 | 201 +1 | 6 +1 | 99.7 +1.3 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Beyma 18P1200Nd | 37 -2 | 0.339 -0.02 | 198 -2 | 8.4 +3.4 | 98.3 -0.1 | close | + | |
| RCF LF 18P400 | 39.5 +0.5 | 0.391 +0.03 | 201 +1 | 8 +3 | 99 +0.6 | close | + | |
| B&C 18PZW100 | 37 -2 | 0.36 = | 186 -14 | 8 +3 | 97.6 -0.8 | close | + | |
| Celestion CF1830E | 40.5 +1.5 | 0.342 -0.01 | 167.9 -32.1 | 5 = | 98.6 +0.2 | close | + | |
| Sica 18 K 4 PL | 36.8 -2.2 | 0.32 -0.04 | 201 +1 | 6.5 +1.5 | 97.8 -0.6 | close | + |
Compare the closest 3 against the L 18/851KN →
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.