Davis 31ST12

12" · 8 Ω · 100 W · 85.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	31 Hz
Qts	0.813
Qes	1.06
Qms	3.48
Vas	58 L
Sd	460 cm²
Xmax	4.1 mm
Re	6.21 Ω
Bl	12.4 T·m
Mms	134.8 g
Pe	100 W
Sensitivity	85.2 dB

Alignment hint

EBP	29 · sealed
Sealed Vb (Qtc ≈ 0.71)	Qts too high

EBP < 50: favours a sealed (closed) 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
Europsonic TS30/600PRO	32 +1	0.782 -0.03	65.9 +7.9	4 -0.1	86 +0.8	close	Xmax 4 mm < 4.1 mm: lower excursion-limited SPL	+
Europsonic TS30/600PRO-8	32 +1	0.782 -0.03	65.9 +7.9	4 -0.1	86 +0.8	close	Xmax 4 mm < 4.1 mm: lower excursion-limited SPL	+
Sphynx SP-W12-GLB	32 +1	0.782 -0.03	65.9 +7.9	5.8 +1.7	86 +0.8	close		+
Infinity Kappa 123WDSSI 2Ohm	34.2 +3.2	0.778 -0.03	58.6153 +0.62	10.2 +6.1	86.0429 +0.84	close	2 Ω vs 8 Ω: amp load changes	+
Pioneer TS-W251R	28.9 -2.1	0.68 -0.13	57.86 -0.14	7.8 +3.7	84.6 -0.6	close	4 Ω vs 8 Ω: amp load changes	+
Soundstream STEALTH-124	29.98 -1.02	0.687 -0.13	59.5 +1.5	13 +8.9	84.8 -0.4	usable		+
Alpine SWE-1242	31 =	0.66 -0.15	61 +3	11.7 +7.6	85.9 +0.7	usable	4 Ω vs 8 Ω: amp load changes	+
Rockford Fosgate R2SD4-12	30.3 -0.7	0.653 -0.16	65.4 +7.4	6.9 +2.8	86.7 +1.5	usable		+
Cerwin-Vega VEGA 124	30.3 -0.7	0.612 -0.2	60.3 +2.3	7 +2.9	86.4 +1.2	usable		+
Selenium 12SW13ADVC 4+4	37 +6	0.854 +0.04	47 -11	7 +2.9	86.2 +1	usable		+

Compare the closest 3 against the 31ST12 →

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.