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Description
Sundown Audio - X-Series v.4 18”The Sundown Xv4 18 Subwoofer delivers unmatched power and control for serious bass enthusiasts. Built with high grade X v. 4 coils, this subwoofer is designed to handle up to 3000W RMS 6000W peak power, ensuring maximum output without distortion. Its optimized design enhances air movement and cooling, providing long lasting performance even under heavy use. The advanced motor structure and large cone area (SD 113. 41) create powerful low frequency
- The Sundown Xv4 18″ Subwoofer delivers unmatched power and control for serious bass enthusiasts. Built with high-grade X v.4 coils, this subwoofer is designed to handle up to 3000W RMS / 6000W peak power, ensuring maximum output without distortion.
- Its optimized design enhances air movement and cooling, providing long-lasting performance even under heavy use. The advanced motor structure and large cone area (SD 113.41) create powerful low-frequency response and clean sound reproduction.
- Perfect for sealed or ported enclosures, the Xv4 18″ gives you flexibility in setup and tuning — whether for SPL competition or everyday high-quality listening.
- Durable, reliable, and beautifully crafted, this subwoofer is the next-level upgrade your sound system deserves.
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18″ Xv4 Series Subwoofer
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3000W RMS / 6000W Peak Power
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Dual 1-Ohm or Dual 2-Ohm Voice Coil Options
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Precision-engineered X v.4 Coils for stability
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Heavy-duty motor with 9.25″ diameter
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Deep bass response with 35 mm Xmax
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Sealed or ported enclosure compatibility
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Recommended Port Tuning: 32 Hz
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Built for extreme durability and clean sound
Specification Value RMS Power 3000 W Peak Power 6000 W Displacement 0.28 cu ft Mounting Depth 15″ Outside Diameter 18.42″ Cutout Diameter 16.69″ Motor Diameter 9.25″ Sealed Enclosure Not Recommended Ported Enclosure 7.00 cu ft Recommended Port Tuning 32 Hz Recommended Port Area 112 sq in 4th Order Sealed Side 3.0 cu ft 4th Order Ported Side 9.0 cu ft 4th Order Port Area 180 sq in 4th Order Port Length 8″ Xmax 35 mm SD (Cone Area) 113.41 RE (Ohms) 2.05 / 3.74 FS (Hz) 25.87 / 25.58 VAS (L) 93.67 Qes 0.63 / 0.55 Qms 4.13 / 4.03 Qts 0.54 / 0.84 BL (NA) 19.74 / 26.8 Mms 737.81 / 656.74 Sensitivity 86 / 87 dB T/S Specs RMS Power (D2)RMS Power (D1)Peak Power (D1)Peak Power (D2)RE D1 (Ohms)RE D2 (Ohms)FS D1 (Hz)FS D2 (Hz)VAS D1 (L)VAS D2 (L)Qes D1Qes D2Qms D1Qms D2Qts D1Qts D2BL D1 (NA)BL D2 (NA)Mms D1 (Grams)Mms D2 (Grams)Cms D1 (uM/N)Cms D2 (uM/N)Sens D1 (dB @ 1w/1m)Sens D2 (dB @ 1w/1m)Xmax D1Xmax D2Subwoofer Measurements Displacement (Inches)Depth (Inches)Cutout (Inches)Motor Diameter (Inches)Ported Enclosure Specs Ported Enclosure SizeRecommended Port AreaRecommended Port Tuning4th Order Enclosure Specs 4th Order Sealed Side4th Order Ported Side4th Order Port Area4th Order Port Length
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.1 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Happy puppy with this durable bone
Size: X-Small, Color: Pink
Our new puppy loves the texture and thickness of this bone. She is an aggressive chewed and has not yet destroyed this bone. We have purchased Nylabones for our dogs year after year and have had several happy puppies over the years.
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Reviewed in the United States on June 4, 2026
★★★★★ 5
Great value for your new puppy!
Pattern Name: Cow Chew Toy Set
My puppy ripped through many other puppy toys before I bought this set. Her favorite toy is the ring with the rope. I don't know if it's intended that she bites the ring part, but she likes the rope part and I hold the ring part. It makes for more enjoyable tug game for me as well since my fingers are protected when she gets over zealous and chomps higher on the rope. The little blue rope is harder on the fingers in that regard, but is great for an integrated tug and toss game. The blue dumbbell is great to hide a treat in the ends or a little peanut butter and has proven durable. The blue and white chewbone is a durable occupier through getting her adult teeth. I save the plushie and the jingle ball for car rides so I don't have as much to report for them. The whole set has been well worth the price. I got this for her at 4 months old and am reviewing at 6 months old. She is about 25 lbs now, so I estimate this set is good for small and medium puppies. Larger puppies might outgrow this faster.
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Reviewed in the United States on January 10, 2020
★★★★★ 5
Perfect for puppies and small dogs
Pattern Name: Cow Chew Toy Set
These toys are perfect for puppies and small dogs. They are well made and very cute. A good buy!
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Reviewed in the United States on January 31, 2026
★★★★★ 5
Great quality and made in the USA!
Pattern Name: Cow Chew Toy Set
I'm very happy with these toys. I can't stand these other toys that break easily and are from other countries that just don't have the same standards we do.
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Reviewed in the United States on March 20, 2026
★★★★★ 4
Great pack of toys for your fur-baby
Pattern Name: Cow Chew Toy Set
Our sweet Ziggy loves these toys. A couple he doesn’t pay much attention to, as he has favorites but there is a good variety and he’s enjoying all. The blue rubber toy with ball shapes in end you must watch them with, even with baby teeth he was able to chew ridges enough to get tiny bits of plastic/rubber off in about 10 minutes. He still plays with it outside. His favorite is the nubby blue/white bone, the rope/ring and snuggly plush. Good value!
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Reviewed in the United States on June 11, 2019