RCF LF 18H400
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 38 Hz |
| Qts | 0.321 |
| Qes | 0.33 |
| Qms | 12.3 |
| Vas | 250 L |
| Sd | 1299.1 cm² |
| Xmax | 7.4 mm |
| Re | 4.9 Ω |
| Bl | 24.3 T·m |
| Mms | 166 g |
| Pe | 900 W |
| Sensitivity | 100.3 dB |
Alignment hint
| EBP | 115 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 64.9 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 |
|---|---|---|---|---|---|---|---|---|
| Fane COLOSSUS 18XB | 36 -2 | 0.323 = | 246 -4 | 7.5 +0.1 | 98.5 -1.8 | close | + | |
| PD 184C002 | 40 +2 | 0.339 +0.02 | 268 +18 | 8.5 +1.1 | 100.6 +0.3 | close | + | |
| Precision Devices 184C002 | 40 +2 | 0.339 +0.02 | 268 +18 | 8.5 +1.1 | 100.6 +0.3 | close | + | |
| Fane 18-800N | 38 = | 0.306 -0.02 | 217 -33 | 7.1 -0.3 | 99.5 -0.8 | close | Xmax 7.1 mm < 7.4 mm: lower excursion-limited SPL | + |
| Peavey LO MAX 18 | 33.5 -4.5 | 0.318 = | 249.7 -0.3 | 9.5 +2.1 | 97.7 -2.6 | close | + | |
| PHL Audio 7050 | 36 -2 | 0.369 +0.05 | 260 +10 | 7.5 +0.1 | 99.3 -1 | close | + | |
| PHL Audio 7010 | 35 -3 | 0.288 -0.03 | 260 +10 | 7.7 +0.3 | 99.1 -1.2 | close | + | |
| PHL Audio 7070 | 35 -3 | 0.288 -0.03 | 260 +10 | 7.7 +0.3 | 99.1 -1.2 | close | + | |
| PD PD 185N002 | 36 -2 | 0.297 -0.02 | 226 -24 | 7.8 +0.4 | 98.7 -1.6 | close | + | |
| Precision Devices PD 185N002 | 36 -2 | 0.297 -0.02 | 226 -24 | 7.8 +0.4 | 98.7 -1.6 | close | + |
Compare the closest 3 against the LF 18H400 →
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.