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RCF LP 18/551

18" · 8 Ω · 500 W · 98.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size18"
Impedance8 Ω
Fs21.7 Hz
Qts0.222
Qes0.228
Qms7.8
Vas760 L
Sd1007 cm²
Xmax10 mm
Re5.7 Ω
Bl18.5 T·m
Mms100.6 g
Pe500 W
Sensitivity98.8 dB

Alignment hint

EBP95 · 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
JBL 2245H20 -1.70.24 +0.02821.2 +61.28.5 -1.597.2 -1.6close300 W vs 500 W: lower power handling · Xmax 8.5 mm < 10 mm: lower excursion-limited SPL+
Altec 318424 +2.30.219 =690.9 -69.16.4 -3.698.5 -0.3usable300 W vs 500 W: lower power handling · Xmax 6.4 mm < 10 mm: lower excursion-limited SPL+
Great Plains Audio 3184 GPA24 +2.30.219 =690.9 -69.16.4 -3.698.5 -0.3usable300 W vs 500 W: lower power handling · Xmax 6.4 mm < 10 mm: lower excursion-limited SPL+
McCauley B186023.9 +2.20.244 +0.02723.6 -36.45.5 -4.599.1 +0.3usableXmax 5.5 mm < 10 mm: lower excursion-limited SPL+
RCF L 18P200KN22.3 +0.60.265 +0.04550 -2109 -196.4 -2.4usable350 W vs 500 W: lower power handling · Xmax 9 mm < 10 mm: lower excursion-limited SPL+
Beyma 18GT200 v124.6 +2.90.213 -0.01595 -1655.8 -4.299.3 +0.5usable250 W vs 500 W: lower power handling · Xmax 5.8 mm < 10 mm: lower excursion-limited SPL+
Eminence 11171221.6 -0.10.288 +0.07736.2 -23.85.8 -4.297.1 -1.7usableXmax 5.8 mm < 10 mm: lower excursion-limited SPL+
McCauley 617420 -1.70.336 +0.11733.4 -26.615.2 +5.295.4 -3.4usable+
Precision Devices PD18427 +5.30.253 +0.03473 -2879.5 -0.597 -1.8usable16 Ω vs 8 Ω: amp load changes · Xmax 9.5 mm < 10 mm: lower excursion-limited SPL+
Eminence B-5222.8 +1.10.229 +0.01430 -3306 -496.6 -2.2usable300 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.