P.Audio C18-650EL

18" · 8 Ω · 1200 W · 99.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	42 Hz
Qts	0.311
Qes	0.33
Qms	5.45
Vas	170 L
Sd	1225 cm²
Xmax	5.3 mm
Re	5.4 Ω
Bl	27.7 T·m
Mms	177.7 g
Pe	1200 W
Sensitivity	99.5 dB

Alignment hint

EBP	127 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 40.8 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
B&C 18HTX100	44 +2	0.323 +0.01	173 +3	5.7 +0.4	100.1 +0.6	close	800 W vs 1200 W: lower power handling	+
Celestion CF1830E	40.5 -1.5	0.342 +0.03	167.9 -2.1	5 -0.3	98.6 -0.9	close	700 W vs 1200 W: lower power handling · Xmax 5 mm < 5.3 mm: lower excursion-limited SPL	+
Beyma 18G50	40 -2	0.321 +0.01	212 +42	6 +0.7	99.3 -0.2	close	750 W vs 1200 W: lower power handling	+
STX W.46.1300.8.MC	36 -6	0.321 +0.01	164 -6	5.5 +0.2	97.5 -2	close	700 W vs 1200 W: lower power handling	+
Oberton 18XB1201	38.05 -3.95	0.317 +0.01	159.37 -10.63	10.5 +5.2	98.5 -1	close		+
PD PDN 18SB40	38.5 -3.5	0.326 +0.02	201.3 +31.3	6 +0.7	98.6 -0.9	close	600 W vs 1200 W: lower power handling	+
Precision Devices PDN 18SB40	38.5 -3.5	0.326 +0.02	201.3 +31.3	6 +0.7	98.6 -0.9	close	600 W vs 1200 W: lower power handling	+
Oberton 18XB1301	35.7 -6.3	0.302 -0.01	172.9 +2.9	8.2 +2.9	97.9 -1.6	close		+
P.Audio C18-650EL v2009	45 +3	0.375 +0.06	158.3 -11.7	5.3 =	99.4 -0.1	close		+
Fane 18-800N	38 -4	0.306 -0.01	217 +47	7.1 +1.8	99.5 =	close	800 W vs 1200 W: lower power handling	+

Compare the closest 3 against the C18-650EL →

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.