Davis 31ST12M v2009

12" · 8 Ω · 100 W · 91.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	22 Hz
Qts	0.39
Qes	0.51
Qms	1.65
Vas	398 L
Sd	567.5 cm²
Xmax	9 mm
Re	6.97 Ω
Bl	10.6 T·m
Mms	59.4 g
Pe	100 W
Sensitivity	91.8 dB

Alignment hint

EBP	43 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 174 L

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
Audiotechnology FLEXUNIT 12D775210KAP Custom	19 -3	0.388 =	340 -58	8.6 -0.4	91.1 -0.7	close	Xmax 8.6 mm < 9 mm: lower excursion-limited SPL	+
Audiotechnology FLEXUNIT 12B775210KAP Custom	19 -3	0.382 -0.01	340 -58	8.6 -0.4	91.2 -0.6	close	Xmax 8.6 mm < 9 mm: lower excursion-limited SPL	+
Visaton WS300	22 =	0.321 -0.07	340 -58	8 -1	92.5 +0.7	usable	Xmax 8 mm < 9 mm: lower excursion-limited SPL	+
Davis 31ST12M	24 +2	0.399 +0.01	260 -138	8.9 -0.1	91.6 -0.2	usable	Xmax 8.9 mm < 9 mm: lower excursion-limited SPL	+
Davis 31ST12M v2011	24 +2	0.399 +0.01	260 -138	8.9 -0.1	91.6 -0.2	usable	Xmax 8.9 mm < 9 mm: lower excursion-limited SPL	+
Wharfedale 3014	20.7 -1.3	0.342 -0.05	319.1 -78.9	8 -1	92.2 +0.4	usable	Xmax 8 mm < 9 mm: lower excursion-limited SPL	+
Realistic 40-1025	21.5 -0.5	0.452 +0.06	526 +128	11.4 +2.4	93.3 +1.5	usable		+
Artech ART33.2	23 +1	0.335 -0.05	340 -58	7 -2	92.7 +0.9	usable	Xmax 7 mm < 9 mm: lower excursion-limited SPL	+
Visaton W300S8	23 +1	0.335 -0.05	340 -58	7 -2	92.7 +0.9	usable	Xmax 7 mm < 9 mm: lower excursion-limited SPL	+
SEAS 33F-WK MH	21.6 -0.4	0.383 -0.01	327.7 -70.3	5 -4	92.1 +0.3	usable	Xmax 5 mm < 9 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 31ST12M v2009 →

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.