SKU: 99894687669

Sky High Car Audio - FXXL Series 15”

Sale price$675.00 Regular price$750.00
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Description

Sky High Car Audio - FXXL Series 15”Sky High Car Audio FXXL Series Subwoofers Our Ferrite Flagship. Purpose Built to Punish The FXXL Series from Sky High Car Audio is the peak of subwoofer engineeringour no compromise solution for those who demand maximum output, precision control, and true competition grade performance. Backed by years of technical experience and hands on development across multiple high performance audio brands, the FXXL Series reflects the very best of everything

Sky High Car Audio FXXL Series Subwoofers

Our Ferrite Flagship. 

Purpose Built to Punish 

The FXXL Series from Sky High Car Audio is the peak of subwoofer engineering—our no-compromise solution for those who demand maximum output, precision control, and true competition-grade performance. Backed by years of technical experience and hands-on development across multiple high-performance audio brands, the FXXL Series reflects the very best of everything we’ve learned in one elite platform.

At the core of the FXXL Series is a massive 4” 8 layer high-temp voice coil, engineered for power handling and consistent output under extreme demand. Rated at 5000W RMS, this coil provides increased surface area and thermal mass, resulting in cooler operation and significantly more headroom than even our FMX series. The FXXL series bridges the gap between SPL monsters and daily drivability. 

Driving that power is a towering quad-stacked 9.96” (253mm) Y35 ferrite motor structure, is packed with features like an aluminum shorting ring, pole vents and (4) drilled and tapped backplate holes, giving builders flexibility for reinforced mounting or enhanced cooling. Our motor design results in maximum airflow and heat dissipation during high-output demos.

Mechanically, the FXXL uses a full 10” progressive spider pack paired with a fiberglass cone support and a hardened paper cone. The cone is tooled with a recessed cavity to seat the standard forged carbon fiber dust cap, increasing structural integrity at peak excursion. The surround is precision-molded foam, delivering control, compliance, and longevity across extreme stroke conditions. To round out the features we utilize a secondary pressure cap nestled under the primary cap which works as a pressure buffer and structural reinforcement to the primary cap.  

Aesthetically, the FXXL Series carries the Sky High signature stealth look—all black with a carbon dust cap, tooled SHCA magnet boot, and oversized push terminals to ensure secure, high-current connectivity. Every design detail, from the cone geometry to the airflow path, was made to maximize both performance and reliability.

Engineered with low FS and high BL, the FXXL plays strong across the entire bass frequency spectrum with precision, power, and musicality…is that a word? Anyways…It’s not just about being loud—it’s about being the best at every level.

Box Designs: Sky High Car Audio is proud to partner with Hunter Martin from EZ DB’s, one of the most respected and proven enclosure designers in the industry. We’ll be offering FREE box designs—including ported, 4th order, and 6th order options where applicable—tailored specifically for our subwoofers to ensure maximum performance and reliability. As a bonus, any customer who purchases 4 or more BMX, FMX, or FXXL series subwoofers directly from Sky High Car Audio will receive a $50 credit toward a custom enclosure design from EZ DB’s, giving you a serious head start on a professionally designed, competition-ready subwoofer enclosure. Every SHCA subwoofer is tested using DATS-LA, measured with the backplate off the surface after full break-in, ensuring accurate and trustworthy TS data. 

SHCA-FXXL-15 Enclosure Designs

Customization Options: Sky High Car Audio is proud to offer in-house custom build options for select subwoofer lines, hand-assembled at our Sparks, NV facility. Customization is available exclusively on the BMX Series 10–18”, FMX Series 12–18”, and FXXL Series 12–18” models. We offer custom Prismatic Powders powder coating in single-stage or two-stage finishes to match your build’s aesthetic (additional cost and lead time apply). For those looking to stand out in the lanes or the show floor, forged carbon fiber cone upgrades are available on FMX and FXXL subs for a premium finish and added cone rigidity. Builders can choose between direct leads (with length and color options) or push terminals on FMX and FXXL models, which come standard with direct leads. We also offer box support add-ons for our threaded backplates and optional back plate cooling modifications for all eligible series (back plate cooling to drop 1/1/26). Lastly we can build you a custom spider pack to meet your needs, but for daily music we highly suggest the stock build form for suspension.  

FXXL: Purpose Built to Punish

Welcome to the Sky High Car Audio Revolution.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 99894687669

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Amazon Customer
Alexandria, US
★★★★★ 5
Son loves them!
Size: Large, Color: Black (6-pairs), Number of Items: 6
My son loves these socks! Comfy, good quality.
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Reviewed in the United States on May 20, 2026
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Tori M
Houston, US
★★★★★ 5
Good fabric
Size: Medium, Color: White, Number of Items: 6
Nice socks. Would buy again.
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Reviewed in the United States on March 23, 2026
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Sarge Howell
West Palm Beach, US
★★★★★ 4
Quality and durable socks
Size: Large, Color: White (6-pairs), Number of Items: 6
Great quality socks. This pack was a lot taller on the cuff and bigger than previous batches I have had. Not sure what the change was, but giving it 4 instead of 5 because I preferred the smaller shorter ones they previously made. But these are great quality socks, and last a long time.
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Reviewed in the United States on February 8, 2026
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Rafael Mota
Waukegan, US
★★★★★ 5
A Game-Changer for Comfort
Size: Medium, Color: Black, Number of Items: 6
I recently upgraded my workout gear with the Under Armour Training Cotton Quarter Socks, and I must say, these socks have revolutionized my exercise experience. Comfortable, durable, and stylish, they truly stand out in the crowded world of athletic socks. First and foremost, the comfort level of these socks is unparalleled. The blend of cotton and synthetic materials provides a soft and plush feel against my feet, making every step a pleasure. The quarter length strikes the perfect balance, offering ample coverage without being too restrictive or too short. It's like walking on clouds, even during the most intense workouts. One of the standout features is the moisture-wicking technology. I've worn these socks during high-intensity cardio sessions, and they have consistently kept my feet dry and comfortable. The breathability is remarkable, preventing that uncomfortable feeling of sweaty feet that often accompanies strenuous workouts. No more distractions – just focus on pushing through your fitness routine. Durability is another strong suit of these socks. After numerous washes, they maintain their shape and elasticity, showing no signs of wear and tear. The reinforced heel and toe areas provide extra support, ensuring longevity and preventing the dreaded sock holes that often plague other brands. The sleek design of the Under Armour Training Cotton Quarter Socks adds a touch of style to my workout attire. The subtle logo and choice of colors make them versatile enough to pair with any athletic shoes. Whether you're hitting the gym, going for a run, or simply running errands, these socks seamlessly blend fashion with function. In terms of sizing, I found that they fit true to size. The elastic band around the arch provides a snug yet comfortable fit, ensuring that the socks stay in place throughout any activity. While the price point may be slightly higher than some other options on the market, the quality and performance of the Under Armour Training Cotton Quarter Socks more than justify the investment. When it comes to comfort, durability, and style, these socks have become an indispensable part of my workout wardrobe.
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Reviewed in the United States on January 3, 2024
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Carol Foshag
Grantham, US
★★★★★ 5
Well made
Size: Large, Color: Black (6-pairs), Number of Items: 6
These are the only socks that my 12 year old Grandson will wear. He's very picky. LOL
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Reviewed in the United States on March 2, 2026

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