RCF LF 18N451

18" · 8 Ω · 1500 W · 98.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	31 Hz
Qts	0.24
Qes	0.25
Qms	6
Vas	245 L
Sd	1220 cm²
Xmax	8.8 mm
Re	5 Ω
Bl	29.6 T·m
Mms	224.5 g
Pe	1500 W
Sensitivity	98.7 dB

Alignment hint

EBP	124 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 31.9 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
RCF LF18N451	31 =	0.24 =	245 =	9 +0.2	97.5 -1.2	close		+
B&C 18 NW 100	31 =	0.254 +0.01	252 +7	8.7 -0.1	98.4 -0.3	close	Xmax 8.7 mm < 8.8 mm: lower excursion-limited SPL	+
B&C 18NW100	31 =	0.26 +0.02	252 +7	9 +0.2	98 -0.7	close		+
RCF LF 18N401	32 +1	0.259 +0.02	257 +12	8.8 =	98.9 +0.2	close		+
RCF LF18N401	32 +1	0.26 +0.02	257 +12	9 +0.2	98 -0.7	close		+
TC Sounds PRO 5100 NEO 2+2	26.5 -4.5	0.241 =	251.4 +6.4	8.6 -0.2	98.9 +0.2	close	4 Ω vs 8 Ω: amp load changes · 1000 W vs 1500 W: lower power handling · Xmax 8.6 mm < 8.8 mm: lower excursion-limited SPL	+
Precision Devices PD.185C003-8	33 +2	0.24 =	224 -21	11 +2.2	97.3 -1.4	close	1000 W vs 1500 W: lower power handling	+
PD PD 185C003	33 +2	0.224 -0.02	224 -21	8.8 =	99.1 +0.4	close		+
Precision Devices PD 185C003	33 +2	0.224 -0.02	224 -21	8.8 =	99.1 +0.4	close		+
Beyma 18PW1400/FE	32 +1	0.273 +0.03	228.9 -16.1	9.1 +0.3	98.3 -0.4	close		+

Compare the closest 3 against the LF 18N451 →

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.