Beyma 12BR70 vp n4

12" · 8 Ω · 125 W · 93.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	35.1 Hz
Qts	0.388
Qes	0.43
Qms	3.93
Vas	95.7 L
Sd	540 cm²
Xmax	4.5 mm
Re	4.9 Ω
Bl	14.9 T·m
Mms	87.8 g
Pe	125 W
Sensitivity	93.9 dB

Alignment hint

EBP	82 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 41.2 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 n1	37.2 +2.1	0.407 +0.02	97.7 +2	4.6 +0.1	94.6 +0.7	close		+
Beyma 12BR70 v2	35 -0.1	0.355 -0.03	100 +4.3	4.1 -0.4	93.4 -0.5	close	Xmax 4.1 mm < 4.5 mm: lower excursion-limited SPL	+
Beyma 12BR70 vp jp	33.7 -1.4	0.365 -0.02	104 +8.3	4.4 -0.1	93.1 -0.8	close	Xmax 4.4 mm < 4.5 mm: lower excursion-limited SPL	+
Ciare M320.5	34.4 -0.7	0.43 +0.04	93.2 -2.5	4.4 -0.1	95.2 +1.3	close	4 Ω vs 8 Ω: amp load changes · Xmax 4.4 mm < 4.5 mm: lower excursion-limited SPL	+
Kartesian WOM300_vDIY	37 +1.9	0.362 -0.03	91.7 -4	6.4 +1.9	94.6 +0.7	close		+
GRS 12PT-8	35 -0.1	0.387 =	112 +16.3	7.8 +3.3	93 -0.9	close		+
McCauley 6232	35 -0.1	0.411 +0.02	106.2 +10.5	8.4 +3.9	93.6 -0.3	close		+
Ciare HSB322 4-4	36 +0.9	0.363 -0.03	83 -12.7	5.4 +0.9	93 -0.9	close		+
Davis 39RCA15 v2024	32.8 -2.3	0.346 -0.04	99.5 +3.8	5.8 +1.3	93.4 -0.5	close		+
Focal 13 WX	33.6 -1.5	0.366 -0.02	89 -6.7	6 +1.5	92.1 -1.8	close		+

Compare the closest 3 against the 12BR70 vp n4 →

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.