Beyma 12BR70 v2

12" · 8 Ω · 125 W · 93.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	35 Hz
Qts	0.355
Qes	0.44
Qms	1.85
Vas	100 L
Sd	540 cm²
Xmax	4.1 mm
Re	5.6 Ω
Bl	15.4 T·m
Mms	84.5 g
Pe	125 W
Sensitivity	93.4 dB

Alignment hint

EBP	80 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 33.7 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
Beyma 12BR70 vp jp	33.7 -1.3	0.365 +0.01	104 +4	4.4 +0.3	93.1 -0.3	close		+
Davis 39RCA15 v2024	32.8 -2.2	0.346 -0.01	99.5 -0.5	5.8 +1.7	93.4 =	close		+
Beyma 12BR70 vp n4	35.1 +0.1	0.388 +0.03	95.7 -4.3	4.5 +0.4	93.9 +0.5	close		+
Tannoy DC 3139 D900 SYSTEM	35 =	0.368 +0.01	103.3 +3.3	3.7 -0.4	91.3 -2.1	close	16 Ω vs 8 Ω: amp load changes · 75 W vs 125 W: lower power handling · Xmax 3.7 mm < 4.1 mm: lower excursion-limited SPL	+
Audax PR300T4 vp série	36 +1	0.349 -0.01	114 +14	4 -0.1	94.7 +1.3	close	Xmax 4 mm < 4.1 mm: lower excursion-limited SPL	+
JBL GT 122	33 -2	0.35 -0.01	101 +1	5.1 +1	96.3 +2.9	close	4 Ω vs 8 Ω: amp load changes	+
Ciare HSB322 4-4	36 +1	0.363 +0.01	83 -17	5.4 +1.3	93 -0.4	close		+
Kartesian WOM300_vDIY	37 +2	0.362 +0.01	91.7 -8.3	6.4 +2.3	94.6 +1.2	close		+
P.Audio BM-12W	38 +3	0.335 -0.02	90.27 -9.73	4.5 +0.4	92.9 -0.5	close	4 Ω vs 8 Ω: amp load changes	+
Focal 13 WX	33.6 -1.4	0.366 +0.01	89 -11	6 +1.9	92.1 -1.3	close		+

Compare the closest 3 against the 12BR70 v2 →

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.