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Stereo Integrity
Stereo Integrity SQL 15 Series 2 | 15 Inch Subwoofer
SKU: SI-SQL15-D2-PAPER
$ 475.99
QUICK SPECS
- Type: 15 in SQL subwoofer, sold individually
- Power Handling: 1000W RMS
- Impedance: Dual 2 ohm or dual 4 ohm
- Enclosure: 2 cu ft sealed, or 4.25 cu ft ported at 22 Hz
- Mounting Depth: 7.4 in, 14.17 in cutout
Stereo Integrity SQL 15 Series 2 | 15 Inch Subwoofer
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Stereo Integrity
SQL 15 Series 2
15 Inch Sound Quality Loud Subwoofer | Sold Individually
1000W RMS 2.75 in Copper Voice Coil Dual 2 or Dual 4 Ohm 2 cu ft Sealed Paper or Carbon Fiber Dust Cap
More Cone, Same SQL Recipe
The SQL 15 Series 2 carries the Stereo Integrity SQL formula to a 15 inch cone. It has 127.6 square inches of piston area, compared with 82.51 on the SQL 12, so it moves considerably more air while keeping the motor, coil, and suspension design that defines the series. Stereo Integrity designed the line in Finite Element Analysis software and verified the coil and mass balance on a Klippel system.
Like the rest of the SQL series, it is built to lay down an accurate sound quality foundation and still hit hard when a track demands it. Stereo Integrity recommends 2 cubic feet sealed or 4.25 cubic feet ported.
Inside the SQL 15
Overhung SGLC Motor
The SQL 15 uses the series SGLC overhung motor with a 2.75 inch solid copper voice coil on a split, black anodized aluminum former. A solid aluminum Faraday ring inside the Y35 ferrite structure reduces inductance so transients stay quick.
Balanced Coil Size
At 2.75 inches the coil sits between the usual 2.5 and 3 inch sizes, keeping inductance below a 3 inch coil while making more motor force than a 2.5 inch coil.
Dual Nomex Spiders
Two 8 3/8 inch Nomex spiders give an even compliance curve through the linear stroke and stiffen near the limit to handle extra excursion. Mirrored, stitched-on flat lead wires keep the coil from rocking.
Treated Paper Cone
The naturally dried, treated paper cone and tall roll rubber surround are matched to the spiders so the suspension stays balanced as excursion climbs.
Enclosure and Power
Stereo Integrity rates the SQL 15 at 1000 watts RMS. Its sealed recommendation is 2 cubic feet, and its ported recommendation is 4.25 cubic feet tuned to 22 Hz with 20 square inches of port area. The driver displaces 0.16 cubic feet.
Built for this driver: Proline X builds Performance Optimized sealed wedge enclosures for the SQL-15 in single and dual configurations, plus a ported wedge, at our shop in Tennessee.
Choosing Your Version
Dual 2 ohm coils wire to 1 ohm in parallel or 4 ohms in series, and dual 4 ohm coils wire to 2 ohms in parallel or 8 ohms in series, so choose the version that matches the load your amplifier wants.
Paper and carbon fiber dust caps are both available. Stereo Integrity publishes one specification set for the SQL 15 and does not list separate figures for either dust cap or impedance.
Fitment
Cutout: 14.17 in. Outer diameter: 15.55 in. Mounting depth: 7.4 in. Displacement: 0.16 cu ft. Stereo Integrity lists 1.25 in from the baffle to the top of the surround.
Authorized Stereo Integrity Dealer
Audio Intensity is an authorized Stereo Integrity dealer, and we build enclosures around their drivers.
Call 931-563-5151 and we will help you match the SQL 15 to the right enclosure, amplifier, and install.
| Specifications | |
|---|---|
| Model | SQL 15 Series 2 |
| Size | 15 in |
| Voice Coil Options | Dual 2 ohm or dual 4 ohm |
| Power Handling (RMS) | 1000 W |
| Voice Coil | 2.75 in copper, 50 mm winding height |
| Cone / Dust Cap | Treated paper cone, paper or carbon fiber dust cap |
| Surround | Tall roll rubber |
| Magnet | Ferrite (Y35) |
| Outer Diameter | 15.55 in |
| Cutout | 14.17 in |
| Mounting Depth | 7.4 in |
| Driver Displacement | 0.16 cu ft |
| Baffle to Top of Surround | 1.25 in |
| Weight | 28 lb |
| Thiele-Small Parameters | |
| Resonant Frequency (Fs) | 33.0 Hz |
| DC Resistance (Re) | 3.2 ohm |
| Voice Coil Inductance (Le) | 2.5 mH |
| Electrical Q (Qes) | 0.61 |
| Mechanical Q (Qms) | 7.60 |
| Total Q (Qts) | 0.57 |
| Equivalent Compliance (Vas) | 59.4 L |
| Effective Piston Area (Sd) | 127.6 sq in |
| Force Factor (Bl) | 20.3 Tm |
| Moving Mass (Mms) | 374.9 g |
| Linear Excursion (Xmax) | 26 mm one-way (70% Bl) |
| SPL | 91 dB |
| Enclosure Recommendations | |
| Sealed | 2 cu ft |
| Ported | 4.25 cu ft tuned to 22 Hz |
| Port Area | 20 sq in |
| Figures as published by Stereo Integrity, which lists one parameter set for both impedance versions. | |
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