Davis 31ST12 v2018

12" · 8 Ω · 100 W · 93.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	34.1 Hz
Qts	0.428
Qes	0.57
Qms	1.72
Vas	195.7 L
Sd	460 cm²
Xmax	5 mm
Re	7.05 Ω
Bl	9.4 T·m
Mms	33.1 g
Pe	100 W
Sensitivity	93.9 dB

Alignment hint

EBP	60 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 113.2 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
Visaton W300-8	32 -2.1	0.449 +0.02	190 -5.7	7 +2	93.4 -0.5	close		+
Philips AD12100/M8	36 +1.9	0.464 +0.04	193.3 -2.4	6.2 +1.2	94.6 +0.7	close		+
Sonido SCW-300	35 +0.9	0.401 -0.03	210 +14.3	4.5 -0.5	95 +1.1	close	50 W vs 100 W: lower power handling · Xmax 4.5 mm < 5 mm: lower excursion-limited SPL	+
Cabasse 30M20	34 -0.1	0.454 +0.03	220 +24.3	4.6 -0.4	96 +2.1	close	Xmax 4.6 mm < 5 mm: lower excursion-limited SPL	+
Philips AD12250W8 vp doum1	29.5 -4.6	0.404 -0.02	216 +20.3	6 +1	93.2 -0.7	close		+
Beyma HP12	36 +1.9	0.401 -0.03	200 +4.3	4 -1	95.6 +1.7	close	Xmax 4 mm < 5 mm: lower excursion-limited SPL	+
Audio Dynamique AD31TPA12G	37.2 +3.1	0.448 +0.02	213.6 +17.9	5 =	97.5 +3.6	close		+
Davis 31TPG-A	37 +2.9	0.448 +0.02	213 +17.3	4.5 -0.5	96.5 +2.6	close	Xmax 4.5 mm < 5 mm: lower excursion-limited SPL	+
Philips AD12100W8 vp doum1	29.9 -4.2	0.413 -0.02	166 -29.7	6 +1	92.5 -1.4	close		+
Faital PRO 12FE330	33 -1.1	0.45 +0.02	146.7 -49	8.32 +3.32	94 +0.1	close		+

Compare the closest 3 against the 31ST12 v2018 →

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.