BMS 15N840 v2015

15" · 8 Ω · 1200 W · 97.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	35.6 Hz
Qts	0.303
Qes	0.32
Qms	5.75
Vas	145.7 L
Sd	845 cm²
Xmax	9.9 mm
Re	5 Ω
Bl	21.9 T·m
Mms	137.3 g
Pe	1200 W
Sensitivity	97.1 dB

Alignment hint

EBP	111 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 32.8 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
Fane COLOSSUS 15XS	36.3 +0.7	0.307 =	149.7 +4	9.1 -0.8	97.3 +0.2	close	Xmax 9.1 mm < 9.9 mm: lower excursion-limited SPL	+
Fane COLOSSUS PRIME 15XS	36.3 +0.7	0.307 =	149.7 +4	9.1 -0.8	97.3 +0.2	close	Xmax 9.1 mm < 9.9 mm: lower excursion-limited SPL	+
BMS 15N840	35.6 =	0.3 =	145.7 =	11 +1.1	95 -2.1	close		+
RCF LF 15X401	34 -1.6	0.289 -0.01	146 +0.3	10.3 +0.4	96.4 -0.7	close		+
Beyma 15LEX1200Nd	36 +0.4	0.3 =	127 -18.7	11 +1.1	97 -0.1	close		+
RCF LF15X401	34 -1.6	0.29 -0.01	146 +0.3	12 +2.1	96.5 -0.6	close		+
Beyma 15P1000	35 -0.6	0.293 -0.01	146 +0.3	8.7 -1.2	96.3 -0.8	close	Xmax 8.7 mm < 9.9 mm: lower excursion-limited SPL	+
B&C 15NBX100	36 +0.4	0.29 -0.01	125 -20.7	10 +0.1	97 -0.1	close		+
18 Sound 15NLW9500	34 -1.6	0.29 -0.01	147.5 +1.8	9 -0.9	96 -1.1	close	4 Ω vs 8 Ω: amp load changes · Xmax 9 mm < 9.9 mm: lower excursion-limited SPL	+
18 Sound 15LW2400	40 +4.4	0.3 =	131 -14.7	10 +0.1	97 -0.1	close		+

Compare the closest 3 against the 15N840 v2015 →

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.