Radian 2218-8

18" · 8 Ω · 800 W · 95.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	33.8 Hz
Qts	0.518
Qes	0.62
Qms	3.16
Vas	282.9 L
Sd	1301 cm²
Xmax	9 mm
Re	6.3 Ω
Bl	20 T·m
Mms	185.9 g
Pe	800 W
Sensitivity	95.5 dB

Alignment hint

EBP	55 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 327.7 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
Radian 2218	33.8 =	0.525 +0.01	286 +3.1	9 =	95.5 =	close		+
Eminence KILOMAX 18	33.8 =	0.527 +0.01	281.4 -1.5	10 +1	96.4 +0.9	close		+
Peerless FSL-1830R09-08	32.7 -1.1	0.587 +0.07	283.1 +0.2	9.6 +0.6	94.6 -0.9	close	600 W vs 800 W: lower power handling	+
SB Audience BIANCO-18SW500	30 -3.8	0.516 =	335 +52.1	9.2 +0.2	95.8 +0.3	close	500 W vs 800 W: lower power handling	+
Eminence KILOMAX PRO 18	33 -0.8	0.557 +0.04	239.9 -43	10 +1	95.1 -0.4	close		+
Eminence KILOMAX PRO 18 A	33 -0.8	0.557 +0.04	239.9 -43	10 +1	95.1 -0.4	close		+
SB Audience 18SW800	33 -0.8	0.456 -0.06	258.1 -24.8	9.3 +0.3	96.8 +1.3	close		+
Eminence KILOMAX PRO-18A	32 -1.8	0.47 -0.05	331.5 +48.6	10 +1	95.8 +0.3	close		+
B&C 18 PS 100 (prodance)	31.5 -2.3	0.458 -0.06	268 -14.9	8 -1	96.2 +0.7	close	Xmax 8 mm < 9 mm: lower excursion-limited SPL	+
Selenium 18SWS1100	34 +0.2	0.447 -0.07	316 +33.1	9.3 +0.3	97.8 +2.3	close		+

Compare the closest 3 against the 2218-8 →

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.