Beyma SM115

15" · 8 Ω · 400 W · 98.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	42 Hz
Qts	0.405
Qes	0.42
Qms	11.3
Vas	185 L
Sd	880 cm²
Xmax	6.7 mm
Re	6.2 Ω
Bl	18.1 T·m
Mms	84.3 g
Pe	400 W
Sensitivity	98.2 dB

Alignment hint

EBP	100 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 90.3 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
18 Sound 15W750	40 -2	0.42 +0.01	182 -3	8 +1.3	98 -0.2	close	16 Ω vs 8 Ω: amp load changes	+
Cyrille Audio GM38F76P	38.8 -3.2	0.419 +0.01	192.6 +7.6	6.6 -0.1	97.7 -0.5	close	Xmax 6.6 mm < 6.7 mm: lower excursion-limited SPL	+
Selenium 15PW5	40 -2	0.4 -0.01	190 +5	5.7 -1	98.3 +0.1	close	Xmax 5.7 mm < 6.7 mm: lower excursion-limited SPL	+
Beyma 15MW/ND v2019	42 =	0.38 -0.03	176 -9	6.3 -0.4	99.2 +1	close	Xmax 6.3 mm < 6.7 mm: lower excursion-limited SPL	+
B&C 15 FCX 76	40 -2	0.445 +0.04	187 +2	6.5 -0.2	97.9 -0.3	close	Xmax 6.5 mm < 6.7 mm: lower excursion-limited SPL	+
Fane SOVEREIGN PRO 15-600 LF	40 -2	0.364 -0.04	188 +3	6.9 +0.2	97.9 -0.3	close		+
Eminence KAPPALITE 3015 LF	42 =	0.387 -0.02	158.8 -26.2	6.4 -0.3	98.3 +0.1	close	Xmax 6.4 mm < 6.7 mm: lower excursion-limited SPL	+
Beyma 15CXA400Fe	40 -2	0.419 +0.01	191 +6	6 -0.7	97.6 -0.6	close	Xmax 6 mm < 6.7 mm: lower excursion-limited SPL	+
Faital PRO 15FH520	36 -6	0.39 -0.02	186.5 +1.5	8.75 +2.05	98 -0.2	close		+
18 Sound 15ND930	38 -4	0.39 -0.02	195 +10	7.5 +0.8	97 -1.2	close	16 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the SM115 →

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.