Stereo Integrity SQL-15 15

15" · 4 Ω · 1000 W · 90.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	23.8 Hz
Qts	0.418
Qes	0.45
Qms	5.83
Vas	115 L
Sd	800 cm²
Xmax	12.1 mm
Re	3.5 Ω
Bl	20.1 T·m
Mms	348.9 g
Pe	1000 W
Sensitivity	90.9 dB

Alignment hint

EBP	53 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 61.8 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
TC Sounds LMS R15	23.6 -0.2	0.446 +0.03	123 +8	12.1 =	90.2 -0.7	close		+
JL Audio 13W7AE-D1.5	23.5 -0.3	0.448 +0.03	104.3 -10.7	12.1 =	91.7 +0.8	close	750 W vs 1000 W: lower power handling	+
Ground Zero GZHW 38X	22.6 -1.2	0.43 +0.01	147 +32	12.5 +0.4	90.3 -0.6	close	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio RSS390HO-4	24.2 +0.4	0.384 -0.03	109.7 -5.3	9.6 -2.5	91.5 +0.6	close	Xmax 9.6 mm < 12.1 mm: lower excursion-limited SPL	+
Dayton Audio MX15-22	21.7 -2.1	0.415 =	146.1 +31.1	12.3 +0.2	90.1 -0.8	close		+
Ciare 15.00SW-4	29 +5.2	0.407 -0.01	113 -2	11.1 -1	93.4 +2.5	close	Xmax 11.1 mm < 12.1 mm: lower excursion-limited SPL	+
Rockford Fosgate T0D215	25.5 +1.7	0.438 +0.02	94.4 -20.6	9.3 -2.8	90.9 =	usable	Xmax 9.3 mm < 12.1 mm: lower excursion-limited SPL	+
18 Sound 15NTLS3500	28 +4.2	0.42 =	141 +26	15.3 +3.2	89 -1.9	usable	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio SS15-22	27 +3.2	0.388 -0.03	98 -17	10.3 -1.8	90.4 -0.5	usable	8 Ω vs 4 Ω: amp load changes · Xmax 10.3 mm < 12.1 mm: lower excursion-limited SPL	+
Dayton Audio TIT400C	24.2 +0.4	0.483 +0.07	154.3 +39.3	13.3 +1.2	91.5 +0.6	usable		+

Compare the closest 3 against the SQL-15 15 →

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.