RCF LP 18/551
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 21.7 Hz |
| Qts | 0.222 |
| Qes | 0.228 |
| Qms | 7.8 |
| Vas | 760 L |
| Sd | 1007 cm² |
| Xmax | 10 mm |
| Re | 5.7 Ω |
| Bl | 18.5 T·m |
| Mms | 100.6 g |
| Pe | 500 W |
| Sensitivity | 98.8 dB |
Alignment hint
| EBP | 95 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 83.1 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 |
|---|---|---|---|---|---|---|---|---|
| JBL 2245H | 20 -1.7 | 0.24 +0.02 | 821.2 +61.2 | 8.5 -1.5 | 97.2 -1.6 | close | 300 W vs 500 W: lower power handling · Xmax 8.5 mm < 10 mm: lower excursion-limited SPL | + |
| Altec 3184 | 24 +2.3 | 0.219 = | 690.9 -69.1 | 6.4 -3.6 | 98.5 -0.3 | usable | 300 W vs 500 W: lower power handling · Xmax 6.4 mm < 10 mm: lower excursion-limited SPL | + |
| Great Plains Audio 3184 GPA | 24 +2.3 | 0.219 = | 690.9 -69.1 | 6.4 -3.6 | 98.5 -0.3 | usable | 300 W vs 500 W: lower power handling · Xmax 6.4 mm < 10 mm: lower excursion-limited SPL | + |
| McCauley B1860 | 23.9 +2.2 | 0.244 +0.02 | 723.6 -36.4 | 5.5 -4.5 | 99.1 +0.3 | usable | Xmax 5.5 mm < 10 mm: lower excursion-limited SPL | + |
| RCF L 18P200KN | 22.3 +0.6 | 0.265 +0.04 | 550 -210 | 9 -1 | 96.4 -2.4 | usable | 350 W vs 500 W: lower power handling · Xmax 9 mm < 10 mm: lower excursion-limited SPL | + |
| Beyma 18GT200 v1 | 24.6 +2.9 | 0.213 -0.01 | 595 -165 | 5.8 -4.2 | 99.3 +0.5 | usable | 250 W vs 500 W: lower power handling · Xmax 5.8 mm < 10 mm: lower excursion-limited SPL | + |
| Eminence 111712 | 21.6 -0.1 | 0.288 +0.07 | 736.2 -23.8 | 5.8 -4.2 | 97.1 -1.7 | usable | Xmax 5.8 mm < 10 mm: lower excursion-limited SPL | + |
| McCauley 6174 | 20 -1.7 | 0.336 +0.11 | 733.4 -26.6 | 15.2 +5.2 | 95.4 -3.4 | usable | + | |
| Precision Devices PD184 | 27 +5.3 | 0.253 +0.03 | 473 -287 | 9.5 -0.5 | 97 -1.8 | usable | 16 Ω vs 8 Ω: amp load changes · Xmax 9.5 mm < 10 mm: lower excursion-limited SPL | + |
| Eminence B-52 | 22.8 +1.1 | 0.229 +0.01 | 430 -330 | 6 -4 | 96.6 -2.2 | usable | 300 W vs 500 W: lower power handling · Xmax 6 mm < 10 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the LP 18/551 →
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.