Audio System R12

12" · 4 Ω · 400 W · 88.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	27.7 Hz
Qts	0.35
Qes	0.38
Qms	4.8
Vas	84.3 L
Sd	531 cm²
Xmax	8.5 mm
Re	3 Ω
Bl	14.6 T·m
Mms	154.2 g
Pe	400 W
Sensitivity	88.6 dB

Alignment hint

EBP	73 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 27.4 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
Alpine SWG-1244	28 +0.3	0.38 +0.03	75 -9.3	10 +1.5	87.7 -0.9	close	250 W vs 400 W: lower power handling	+
Gladen ZERO 12 PRO	27 -0.7	0.38 +0.03	93.72 +9.42	12.5 +4	88.5 -0.1	close		+
AER SB 12	29 +1.3	0.349 =	82 -2.3	7.1 -1.4	90.6 +2	close	8 Ω vs 4 Ω: amp load changes · 300 W vs 400 W: lower power handling · Xmax 7.1 mm < 8.5 mm: lower excursion-limited SPL	+
Auditor RIP 300P	28.9 +1.2	0.35 =	79.3 -5	8.8 +0.3	92.6 +4	close		+
Oxygen AIR2 300 vp	22 -5.7	0.34 -0.01	82 -2.3	9.6 +1.1	89.4 +0.8	close	300 W vs 400 W: lower power handling	+
Dayton Audio RSS315HF-4 v2016	24.2 -3.5	0.388 +0.04	84.1 -0.2	9.3 +0.8	90.3 +1.7	close		+
Powerbass M-124	29.15 +1.45	0.41 +0.06	77.3 -7	9.5 +1	88 -0.6	close		+
Tang Band W8Q-1071F	27 -0.7	0.334 -0.02	70.4 -13.9	9.7 +1.2	91.8 +3.2	close		+
Focal 13W 8711	28.8 +1.1	0.328 -0.02	87.1 +2.8	7.9 -0.6	93.4 +4.8	close	Xmax 7.9 mm < 8.5 mm: lower excursion-limited SPL	+
Focal 13W 8711 vp	28.8 +1.1	0.328 -0.02	87.1 +2.8	7.9 -0.6	93.4 +4.8	close	Xmax 7.9 mm < 8.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the R12 →

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.