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SQL 12 Series 2

(11 customer reviews)
$295.99 – $370.99

SQL-12 Subwoofers are sold as singles.

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Description

Sound Quality Loud

The SQL series stands as our best-ever produced subwoofer when it comes to performance-to-cost ratio. It’s engineered to offer a solid Sound Quality (SQ) foundation, complemented by the potential for gut-wrenching bass when needed. The SQL series, fully designed using Finite Element Analysis (FEA) simulation software, embodies its name, delivering Sound Quality Loud.

The motor topology of our SQL series is based on an SGLC overhung design. It employs a solid copper winding 2.75″ voice coil, which is wound on a split black anodized aluminum former. The choice of a 2.75″ diameter coil strikes the perfect balance between 2.5″ and 3.0″ coil diameters – it maintains less inductance than a 3″ coil while offering more motor force than a 2.5″ coil. The coil and overall mass balance have been meticulously calculated and verified through multiple Klippel test sessions, resulting in a 50 mm winding width coil (voice coil winding height). Nested inside the Y35 grade magnet structure, you’ll find a solid aluminum faraday ring that reduces inductance for enhanced transient attack characteristics.

Our SQL series is equipped with large 8 3/8″ dual Nomex spiders. They offer a uniform suspension compliance curve that minimizes suspension distortion over the linear stroke. These spiders are designed to stiffen up at or near the limits of Xmax to handle extra excursion when necessary. Dual mirror flat woven lead wires, sewn onto the top of the spider, ensure symmetrical compliance on both sides, effectively eliminating the coil rocking issues associated with single leaded spiders.

On the exterior, a stiff naturally dried, treated paper cone and tall roll rubber surround grace the top of the SQL series subwoofer. The paper pulp cone brings the ideal mass for improved low-frequency reproduction, while the tall rubber surround harmoniously complements the dual Nomex spiders, creating a perfectly balanced suspension curve. Click on the white BL/Kms plot adjacent to the subwoofer images to view the Klippel results.

Finally, the design of the enclosure and the overall performance of the SQL series cannot be overlooked. These subwoofers can operate efficiently in a very small sealed enclosure or in small to medium-sized vented enclosures. The low F3 points in the sealed enclosures of the SQL series enable them to play down to 8 Hz, making them unrivaled low-end performers even in compact sealed boxes. The immaculate output capability at full volume is directly attributed to their 28 mm one-way linear Xmax.

In sum, our SQL series subwoofers readily deliver clean, loud, and broad bandwidth performance, even in small enclosures. Elevate your audio experience with the SQL series.

Additional information

Impedance

Dual 2 ohm, Dual 4 ohm
Dust Cap Material

Paper, Carbon Fiber

Subwoofers Specifications

Quick Info

Weight26 lbs
Dimensions (OD)12.75 inches
Dimensions (Cutout)11.5 inches
Mounting Depth7 inches
Displacement0.15 cubic feet
RMS1000 watts

Thiele-Small Parameters

Re3.4 Ohms
Fs27.9 Hz
Qes0.49 –
Qms3.51 –
Qts0.43 –
Le2 mH
Sd82.51 square inches
Vas29 Liters
BL23.4 Tesla Meters
Mms449.8 grams
Cms72.2 µM/N
Xmax28.4 mm one-way 70% BL
SPL92 dB

Materials

Surround MaterialRubber –
Cone MaterialPaper –
Voice Coil MaterialCopper –
Magnet MaterialFerrite –

Enclosure Recommendations

Minimum Sealed Enclosure Volume0.65 cubic feet
Maximum Sealed Enclosure Volume1 cubic feet
Ported Enclosure Volume1.5 cubic feet
Ported Enclosure Tuning24 Hz

Additional Specifications

Voice Coil Diameter2.75 inches
Terminal TypeSpring loaded push –
Gross Weight28 lbs
Distance from baffle to top of surround1.25 inches
Minimum clearance from top of surround to speaker grill0.5 inches

11 reviews for SQL 12 Series 2

  1. Charles Hamilton (verified owner) –

    Loving the sql 12 in a ported box. It’s accurate and produces enormous amounts of bass for my application.

  2. Wind –

    One of the pioneer batch during the pre orders. Owned 4 of them with 2 driver in single cabinet. I only heard good comments on how big these boys sound as well as how punchy it is in my H setup from my customers!

  3. Bill –

    Love the SQL12s! I have 3 of them now and will continue to put them in all my cars. I replaced some much more “high end” subwoofers and there simply is no comparison. These are easily the best sounding 12″ I have ever heard. Not only does it dig super deep but its musically transparent in that it does not sound like a speaker reproducing the tone but the actual instrument itself. Bass drum attack and decay is first rate. They also have the uncanny ability to get very very loud! The fact that it works in such a small box is just the cream on top. Excellent speaker with world class customer service to stand behind it!

  4. Benjamin Heien (verified owner) –

    2 12”s in 3.2 cu @ 28 hz.
    CAB-22 for power.
    They really have some volume when called upon. They keep up with the fastest kick drum you’ll ever find, and high quality recordings make them sound like an actual drum with perfect decay.

    Amazing customer service if you actually call Nick as opposed to posting on FB. Nicks a good dude for sure.

  5. Cody (verified owner) –

    Got this d2 in my truck today. I was honestly surprised and blown away, I previously had a single 15” running on about 2500 watts. This 12 out performs my previous setup and I will suggest this speaker and any of the stereo integrity products to everyone. Simply I was blown away figuratively and literally.

  6. Mike –

    I have used the SQL Subwoofers in my home theater for quite some time. I built a small, sealed custom enclosure for them and am running two 12-inch SQLs. They are AMAZING! Best Home Theater subs I could have asked for. Perhaps someday, I will move up to that hefty 24 when space allows for it. However, if you have the itch to do a DIY build, this is the way.

  7. Corey Reeves (5 Star Audio Solutions) (verified owner) –

    I purchased a single SQL 12 d2 built a 1.5ft³ box w/ 4″ aero port. I was so impressed that I sold the d2 and purchased a pair of d4s. I ordered them on 11/3 and received them on 11/6. Talk about fast shipping. The pair will be going in a 3.12ft³ box w/ 6″ aero port. Not sure of the amp yet. Possibly the SI 3000. Thanks again Nick. Love the products and service.

  8. Giovanni (verified owner) –

    Great subs. I’m running a sealed 12” and ported 15” on a 3200w amp with recommended tune and box volume, the range of these subs is great, I’ll say though that the power to loudness ratio isn’t the greatest, but it’s an sql sub so it makes sense.

  9. Aren –

    I already had nine subs in my theater already so for me it was just to add bass but this is definitely my favorite sub of the bunch now. I built a ported enclosure to si specs and double skinned the whole cabinet with 3\4″ birch. It weighs a ton but sounds phenomenal! Thanks stereo integrity for the sweet deal and mostly for the sweat that went into developing this quality subwoofer. Now i gotta start making room for the 24. Maybe ill put it in the floor or the ceiling.

  10. Aaron Chavez (verified owner) –

    I purchased a 12″ SQL after I read about how well it performed in a small sealed enclosure. I needed the space in my trunk. I am beyond impressed with the sound accuracy, clarity, and loudness in a 1 cubic foot enclosure. I am powering it with a 1200 watt Skar amplifier. I bought a dual 2 ohm sub and wired it down to 1 ohm. I 100% recommend it to anyone, purchase this subwoofer with confidence. It will not disappoint you.

  11. Andrew –

    These have given what I’ve been missing out on. Clean and powerful bass. I’ve been using morel ultimo 12s for the past decade and no experience with other subwoofers until I wanted to try an IDMAX 12. 1 of those gave as much if not more bump than the 2 ultimos. Read the SQL is the new go sql subwoofer and everyone was right. These are amazing, even more so that the enclosures they need are small. 33% smaller than the ultimos. Can’t forget the price. Absolute bargain imo

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