Infinity BETA15

15" · 4 Ω · 350 W · 98.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	24.4 Hz
Qts	0.23
Qes	0.24
Qms	5.82
Vas	289.9 L
Sd	829 cm²
Xmax	7.9 mm
Re	3.4 Ω
Bl	17.5 T·m
Mms	141.5 g
Pe	350 W
Sensitivity	98.1 dB

Alignment hint

EBP	102 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 34.3 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
Beyma SM115/K vp1	27.6 +3.2	0.222 -0.01	296.7 +6.8	8 +0.1	98.3 +0.2	close	8 Ω vs 4 Ω: amp load changes	+
Beyma SM115/K vp2	29.8 +5.4	0.228 =	291 +1.1	8 +0.1	99 +0.9	close	8 Ω vs 4 Ω: amp load changes	+
STX W.38.800.4.MC	27 +2.6	0.219 -0.01	272 -17.9	8 +0.1	99.9 +1.8	close		+
Magnat SUB 400 SUPREME	21 -3.4	0.228 =	330 +40.1	9.5 +1.6	96.7 -1.4	close		+
Beyma SM115/K	29 +4.6	0.249 +0.02	273 -16.9	8 +0.1	97.2 -0.9	close	8 Ω vs 4 Ω: amp load changes	+
Beyma SM-115/K	27 +2.6	0.253 +0.02	345 +55.1	8 +0.1	97.5 -0.6	close	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio APOLLO 15LF	25.5 +1.1	0.26 +0.03	331 +41.1	9.3 +1.4	96 -2.1	usable	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio 15LF ODEUM	25.5 +1.1	0.26 +0.03	331.3 +41.4	9.3 +1.4	96 -2.1	usable	8 Ω vs 4 Ω: amp load changes	+
STX W.38.800.8.MC	28 +3.6	0.252 +0.02	247 -42.9	8 +0.1	96.5 -1.6	usable	8 Ω vs 4 Ω: amp load changes	+
Beyma 15BR400	30 +5.6	0.236 +0.01	274 -15.9	6 -1.9	98.3 +0.2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 6 mm < 7.9 mm: lower excursion-limited SPL	+

Compare the closest 3 against the BETA15 →

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.