BMS 18N850 8 Ohms

18" · 8 Ω · 1200 W · 95.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	24.4 Hz
Qts	0.251
Qes	0.26
Qms	7.23
Vas	288 L
Sd	1212 cm²
Xmax	10.6 mm
Re	5.7 Ω
Bl	32 T·m
Mms	304.2 g
Pe	1200 W
Sensitivity	95.5 dB

Alignment hint

EBP	94 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 41.5 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
BMS 18N850 4 Ohms	23.7 -0.7	0.261 +0.01	288 =	11 +0.4	97.8 +2.3	close	4 Ω vs 8 Ω: amp load changes	+
Oberton 18NSW700	30.48 +6.08	0.243 -0.01	309.02 +21.02	14 +3.4	97.5 +2	usable	700 W vs 1200 W: lower power handling	+
BMS 18S450	29 +4.6	0.31 +0.06	281 -7	12 +1.4	95 -0.5	usable		+
Mach 5 Audio UXL-18	18.6 -5.8	0.282 +0.03	285.5 -2.5	10 -0.6	94 -1.5	usable	4 Ω vs 8 Ω: amp load changes · 600 W vs 1200 W: lower power handling · Xmax 10 mm < 10.6 mm: lower excursion-limited SPL	+
TC Sounds PRO 5100 NEO 2+2	26.5 +2.1	0.241 -0.01	251.4 -36.6	8.6 -2	98.9 +3.4	usable	4 Ω vs 8 Ω: amp load changes · Xmax 8.6 mm < 10.6 mm: lower excursion-limited SPL	+
B&C 18PZB100	30 +5.6	0.24 -0.01	297 +9	8 -2.6	97 +1.5	usable	700 W vs 1200 W: lower power handling · Xmax 8 mm < 10.6 mm: lower excursion-limited SPL	+
Faital PRO 18XL2000	28 +3.6	0.27 +0.02	232.1 -55.9	16.32 +5.72	97 +1.5	usable		+
BMS 18N840V2	28.5 +4.1	0.314 +0.06	288 =	10 -0.6	97.1 +1.6	usable	Xmax 10 mm < 10.6 mm: lower excursion-limited SPL	+
RCF LF18X400	28 +3.6	0.27 +0.02	340 +52	9 -1.6	97.5 +2	usable	Xmax 9 mm < 10.6 mm: lower excursion-limited SPL	+
RCF LF 18X401	30 +5.6	0.298 +0.05	274 -14	11.4 +0.8	97.5 +2	usable		+

Compare the closest 3 against the 18N850 8 Ohms →

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.