Beyma 18G550/S-8

18" · 8 Ω · 900 W · 97.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	33 Hz
Qts	0.396
Qes	0.42
Qms	7
Vas	290 L
Sd	1320 cm²
Xmax	9.3 mm
Re	5.6 Ω
Bl	23.3 T·m
Mms	195.9 g
Pe	900 W
Sensitivity	97.5 dB

Alignment hint

EBP	79 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 132.5 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
Beyma 18G550 v2018	33 =	0.396 =	290 =	9 -0.3	97.5 =	close	Xmax 9 mm < 9.3 mm: lower excursion-limited SPL	+
Dayton Audio APOLLO 18F	32 -1	0.401 +0.01	287.7 -2.3	10.6 +1.3	96.4 -1.1	close		+
Beyma 18LEX1000/Nd	34 +1	0.391 -0.01	260 -30	9.4 +0.1	97.8 +0.3	close		+
Beyma 18LEX1200FE	32 -1	0.378 -0.02	277 -13	11 +1.7	97.4 -0.1	close		+
Beyma 18LEX1000Nd	34 +1	0.39 -0.01	260 -30	11 +1.7	98 +0.5	close		+
SB Audience ROSSO-18SW650	31 -2	0.418 +0.02	304.3 +14.3	9 -0.3	97.2 -0.3	close	650 W vs 900 W: lower power handling · Xmax 9 mm < 9.3 mm: lower excursion-limited SPL	+
Beyma 18G550 (prodance)	29.5 -3.5	0.382 -0.01	291 +1	9 -0.3	96.7 -0.8	close	Xmax 9 mm < 9.3 mm: lower excursion-limited SPL	+
Beyma 18LEX1000Fe	34 +1	0.38 -0.02	250 -40	11 +1.7	98 +0.5	close		+
Faital PRO 18HP1010	35 +2	0.4 =	240.1 -49.9	9.75 +0.45	98 +0.5	close		+
Selenium 18SWS1100	34 +1	0.447 +0.05	316 +26	9.3 =	97.8 +0.3	close		+

Compare the closest 3 against the 18G550/S-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.