BMS 18N840V2

18" · 8 Ω · 1200 W · 97.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	28.5 Hz
Qts	0.314
Qes	0.33
Qms	6.66
Vas	288 L
Sd	1213 cm²
Xmax	10 mm
Re	5 Ω
Bl	24.6 T·m
Mms	223.3 g
Pe	1200 W
Sensitivity	97.1 dB

Alignment hint

EBP	86 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 70.7 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
BMS 18S450	29 +0.5	0.31 =	281 -7	12 +2	95 -2.1	close		+
RCF LF18X401	30 +1.5	0.3 -0.01	274 -14	12 +2	97.5 +0.4	close		+
RCF LF18Y402	30 +1.5	0.3 -0.01	274 -14	12 +2	97.5 +0.4	close		+
RCF LF 18X401	30 +1.5	0.298 -0.02	274 -14	11.4 +1.4	97.5 +0.4	close		+
PD PD 18BR40	30 +1.5	0.32 +0.01	309 +21	9.3 -0.7	98 +0.9	close	700 W vs 1200 W: lower power handling · Xmax 9.3 mm < 10 mm: lower excursion-limited SPL	+
Precision Devices PD 18BR40	30 +1.5	0.32 +0.01	309 +21	9.3 -0.7	98 +0.9	close	700 W vs 1200 W: lower power handling · Xmax 9.3 mm < 10 mm: lower excursion-limited SPL	+
PD PD 186	27 -1.5	0.313 =	353 +65	10.2 +0.2	96.9 -0.2	close	700 W vs 1200 W: lower power handling	+
Precision Devices PD 186	27 -1.5	0.313 =	353 +65	10.2 +0.2	96.9 -0.2	close	700 W vs 1200 W: lower power handling	+
RCF L 18P200N	28 -0.5	0.306 -0.01	363 +75	9.8 -0.2	97 -0.1	close	800 W vs 1200 W: lower power handling · Xmax 9.8 mm < 10 mm: lower excursion-limited SPL	+
Ciare 18.00 NDW1	29.2 +0.7	0.312 =	296.4 +8.4	7 -3	97.1 =	close	500 W vs 1200 W: lower power handling · Xmax 7 mm < 10 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 18N840V2 →

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.