RCF LF 18X451

18" · 8 Ω · 1800 W · 96.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	30 Hz
Qts	0.278
Qes	0.29
Qms	6.7
Vas	220 L
Sd	1220 cm²
Xmax	10.7 mm
Re	5.4 Ω
Bl	30.6 T·m
Mms	266.9 g
Pe	1800 W
Sensitivity	96.8 dB

Alignment hint

EBP	103 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 40.2 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
RCF LF18X451	30 =	0.28 =	220 =	14 +3.3	97 +0.2	close		+
Faital PRO 18XL1700	28 -2	0.28 =	227 +7	16.17 +5.47	97 +0.2	close		+
18 Sound 18NLW4100	29 -1	0.27 -0.01	207 -13	15 +4.3	97 +0.2	close	4 Ω vs 8 Ω: amp load changes	+
18 Sound 18LW2600	30 =	0.28 =	186 -34	14 +3.3	96.5 -0.3	close	4 Ω vs 8 Ω: amp load changes	+
RCF LF 18N405	30 =	0.324 +0.05	227 +7	10.8 +0.1	96.7 -0.1	close		+
Faital PRO 18XL2000	28 -2	0.27 -0.01	232.1 +12.1	16.32 +5.62	97 +0.2	close		+
Beyma 18PW1400FE /S	32 +2	0.27 -0.01	228.9 +8.9	10 -0.7	98 +1.2	close	1400 W vs 1800 W: lower power handling · Xmax 10 mm < 10.7 mm: lower excursion-limited SPL	+
RCF LF18N405	30 =	0.32 +0.04	227 +7	14 +3.3	97 +0.2	close		+
18 Sound 18LW2600	31 +1	0.29 +0.01	187 -33	14.8 +4.1	96.8 =	close		+
B&C 18NW100	30 =	0.27 -0.01	203.5 -16.5	9 -1.7	95 -1.8	close	4 Ω vs 8 Ω: amp load changes · 1199 W vs 1800 W: lower power handling · Xmax 9 mm < 10.7 mm: lower excursion-limited SPL	+

Compare the closest 3 against the LF 18X451 →

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.