Beyma 12BR70 vp jp

12" · 8 Ω · 125 W · 93.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	33.7 Hz
Qts	0.365
Qes	0.44
Qms	2.14
Vas	104 L
Sd	540 cm²
Xmax	4.4 mm
Re	5.6 Ω
Bl	15.4 T·m
Mms	87.7 g
Pe	125 W
Sensitivity	93.1 dB

Alignment hint

EBP	77 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 37.8 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 v2	35 +1.3	0.355 -0.01	100 -4	4.1 -0.3	93.4 +0.3	close	Xmax 4.1 mm < 4.4 mm: lower excursion-limited SPL	+
Davis 39RCA15 v2024	32.8 -0.9	0.346 -0.02	99.5 -4.5	5.8 +1.4	93.4 +0.3	close		+
Beyma 12BR70 vp n4	35.1 +1.4	0.388 +0.02	95.7 -8.3	4.5 +0.1	93.9 +0.8	close		+
Focal 13 WX	33.6 -0.1	0.366 =	89 -15	6 +1.6	92.1 -1	close		+
Tannoy DC 3139 D900 SYSTEM	35 +1.3	0.368 =	103.3 -0.7	3.7 -0.7	91.3 -1.8	close	16 Ω vs 8 Ω: amp load changes · 75 W vs 125 W: lower power handling · Xmax 3.7 mm < 4.4 mm: lower excursion-limited SPL	+
GRS 12PT-8	35 +1.3	0.387 +0.02	112 +8	7.8 +3.4	93 -0.1	close		+
JBL GT 122	33 -0.7	0.35 -0.02	101 -3	5.1 +0.7	96.3 +3.2	close	4 Ω vs 8 Ω: amp load changes	+
Audio Dynamique 320/75	32 -1.7	0.341 -0.02	116 +12	5 +0.6	93.8 +0.7	close		+
Ciare HSB322 4-4	36 +2.3	0.363 =	83 -21	5.4 +1	93 -0.1	close		+
McCauley 6232	35 +1.3	0.411 +0.05	106.2 +2.2	8.4 +4	93.6 +0.5	close		+

Compare the closest 3 against the 12BR70 vp jp →

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.