Soundstream T4-12

12" · 4 Ω · 900 W · 91.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	36.5 Hz
Qts	0.371
Qes	0.414
Qms	3.584
Vas	29.3 L
Sd	521 cm²
Xmax	6.6 mm
Re	3.2 Ω
Bl	20.9 T·m
Mms	246.8 g
Pe	900 W
Sensitivity	91.3 dB

Alignment hint

EBP	88 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 11.1 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
FI Audio Q12 DUAL 2	33.9 -2.6	0.371 =	28.3 -1	10.6 +4	91.1 -0.2	close		+
Ascendant Audio HAVOC 12 D2	33.7 -2.8	0.379 +0.01	28.9 -0.4	8.2 +1.6	94 +2.7	close	2 Ω vs 4 Ω: amp load changes	+
Audio System KRYPTON 12	37 +0.5	0.39 +0.02	30 +0.7	17 +10.4	87.5 -3.8	close		+
Hifonics CX12D2	36 -0.5	0.336 -0.03	25 -4.3	12.5 +5.9	90.1 -1.2	close	8 Ω vs 4 Ω: amp load changes	+
MTX Audio TX812	35 -1.5	0.422 +0.05	24.6 -4.7	10 +3.4	91.6 +0.3	close		+
Ciare 12.00 SW	43.61 +7.11	0.38 +0.01	32 +2.7	11.5 +4.9	90.1 -1.2	usable	8 Ω vs 4 Ω: amp load changes	+
Gladen SQX12	36.7 +0.2	0.405 +0.03	40.9 +11.6	7 +0.4	92.6 +1.3	usable	600 W vs 900 W: lower power handling	+
Gladen SQL 12 EXTREME	33 -3.5	0.353 -0.02	36 +6.7	9.4 +2.8	93.1 +1.8	usable	2 Ω vs 4 Ω: amp load changes	+
Dayton Audio RSS315HO-4	31.6 -4.9	0.407 +0.04	33.5 +4.2	7.2 +0.6	89.4 -1.9	usable	700 W vs 900 W: lower power handling	+
B&C 12BG76	44 +7.5	0.41 +0.04	32 +2.7	9.5 +2.9	92 +0.7	usable	8 Ω vs 4 Ω: amp load changes · 500 W vs 900 W: lower power handling	+

Compare the closest 3 against the T4-12 →

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.