Davis 31ST12M

12" · 8 Ω · 100 W · 91.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	24 Hz
Qts	0.399
Qes	0.5
Qms	1.98
Vas	260 L
Sd	460 cm²
Xmax	8.9 mm
Re	6.3 Ω
Bl	9.8 T·m
Mms	50.2 g
Pe	100 W
Sensitivity	91.6 dB

Alignment hint

EBP	48 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 121.5 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
Davis 31ST12M v2011	24 =	0.399 =	260 =	8.9 =	91.6 =	close		+
Peerless 831857	24 =	0.433 +0.03	210 -50	9 +0.1	91.3 -0.3	close		+
SB Acoustics SB34NRX75-6	19 -5	0.397 =	260 =	11 +2.1	91 -0.6	close		+
SB Acoustics SB34NRX75-6 vp	22.2 -1.8	0.444 +0.04	240 -20	11 +2.1	92 +0.4	close		+
Peerless 315SWR	24 =	0.433 +0.03	210 -50	8 -0.9	91.3 -0.3	close	Xmax 8 mm < 8.9 mm: lower excursion-limited SPL	+
Audax 180040A	22.4 -1.6	0.392 -0.01	239.6 -20.4	8 -0.9	88.7 -2.9	close	16 Ω vs 8 Ω: amp load changes · Xmax 8 mm < 8.9 mm: lower excursion-limited SPL	+
Peerless SLS315	24.4 +0.4	0.452 +0.05	205.2 -54.8	7.8 -1.1	91.4 -0.2	usable	Xmax 7.8 mm < 8.9 mm: lower excursion-limited SPL	+
Aurum Cantus AC300/75C2C	22 -2	0.352 -0.05	232 -28	8 -0.9	90.3 -1.3	usable	Xmax 8 mm < 8.9 mm: lower excursion-limited SPL	+
Davis 31ST12M v2009	22 -2	0.39 -0.01	398 +138	9 +0.1	91.8 +0.2	usable		+
JBL 123A	25 +1	0.49 +0.09	235 -25	7.9 -1	93.1 +1.5	usable	Xmax 7.9 mm < 8.9 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 31ST12M →

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.