SKU: 93577673102

Ascendo The28 Sub Pro Passive Squared Infrasonic Subwoofer

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Description

Ascendo The28 Sub Pro Passive Squared Infrasonic SubwooferTHE 28 SUB PRO SQUARED: The Future of Bass Has Arrived Revolutionising Home Theatre Bass The 28 Sub Pro Squared is not just a subwooferits a breakthrough in low frequency performance. Inspired by a discussion with Trinnov CEO Arnaud Laborie at the ISE Show, this subwoofer was engineered to push the boundaries of bass reproduction. After extensive research and development, it features an ultra powerful 28 inch composite sandwich cone, constructed from

THE 28 SUB PRO SQUARED: The Future of Bass Has Arrived

Revolutionising Home Theatre Bass

The 28 Sub Pro Squared is not just a subwoofer—it’s a breakthrough in low-frequency performance. Inspired by a discussion with Trinnov CEO Arnaud Laborie at the ISE Show, this subwoofer was engineered to push the boundaries of bass reproduction. After extensive research and development, it features an ultra-powerful 28-inch composite sandwich cone, constructed from multiple layers of Rohacell. With a cone surface equivalent to a 32-inch round subwoofer, it sets a new benchmark for deep, powerful, and precise bass.

Unrivalled Performance in Any Space

Designed to deliver exceptional output with a minimal footprint, the 28 Sub Pro Squared is the ideal solution for high-performance home theatre setups. Whether used in a subwoofer cluster, Trinnov WaveForming, Dirac ART, double bass arrays, or single bass arrays, it integrates seamlessly while producing earth-shaking, infrasonic frequencies—bass that is felt as much as it is heard.

It also extends beyond the standard 120Hz LFE cutoff, making it the ultimate kick woofer for high-impact effects. Whether it’s the deep resonance of an explosion or the sharp crack of a gunshot, every sound is reproduced with incredible clarity, precision, and intensity.

Precision-Engineered for Maximum Impact

With a depth of just 30 cm, the 28 Sub Pro Squared fits into spaces where other subwoofers cannot, yet it delivers unrivalled performance. Its compact yet commanding dimensions—80 cm wide and 100 cm high—allow for close woofer spacing, ensuring perfect coupling in bass arrays with control up to 120Hz.

Cutting-Edge Engineering for an Immersive Experience

This subwoofer is engineered to deliver not just deep bass, but accurate and controlled bass. With an ultra-powerful motor structure, it generates a perfect planar wave front, offering high efficiency, extreme power handling, and low system Q. The result is bass that is tight, fast, and dynamic, ensuring every note and effect is delivered with stunning accuracy.

Experience Sound Like Never Before

The 28 Sub Pro Squared by Ascendo is more than just a subwoofer—it’s a gateway to an immersive audio experience. Whether for blockbuster movies, high-impact gaming, or music, it delivers bass that can be felt in the chest and throughout the room.

✅ Groundbreaking low-frequency performance
✅ Compact yet powerful design
✅ Seamless integration into advanced home theatre systems
✅ Precision engineering for tight, controlled bass

Stop just watching films—start experiencing them.

Specification

Speaker type

28" forward-firing, advanced carbon rohacell composite sandwich flat panel cone, neodymium motors with quad 4” ultra-high-temperature voice-coil

Xmax

22mm Xmax excursion each direction (44 mm linear), voice coil remaining in homogeneous magnetic field

Passive | Active

Passive

Recommended amplifiers 

1Ch Amplifier is required. Min. recommended amplifier: 141 Vrms, 200 Vpk, 17.7 A; equivalent to 2500W@8 Ohm, up to 450V Peak. Other configuration can be 2 x 4 Ohms with 2 x 250V Peak (2 x 178V RMS)

Recommended ASCENDO amplifiers  

(With DSP-4D: AIA2-10K2 IS), DSP4-10K2

Principle

Sealed

SPL (Peak / half space 2pi)

Measurement data
140 dB @80 Hz and up
123 dB @ 20Hz
100 dB @ 11Hz
Please refer to our measurement report for more details

Frequency range

Measurement data (without DSP)
38 Hz - 640 Hz / -10 dB

 Efficiency 

91.8 dB / 1W/m 4 pi, 97.8 dB / 1W/m 2

Power handling 

30kW Peak

Impedance 

4 Ω  

Air volume displacement 

11.7 L / 713 cu in comparison 18" standard cinema subwoofer 1,1 L

Directivity horizontal x vertical in Deg°

360°

Input terminal

4-conductor Phoenix 10 AWG (5,26 mm²)

Enclosure

Internally braced MDF

Width 

37,80 " | 800 mm

Height

39,37 " | 1000 mm

Height with feet 

39,96 " | 1015 mm

Depth without grill 

11,81 " | 300 mm

Weight

308,65 lbs | 140 kg

Finish 

Satin matte black

 

Technical modifications subject to change without further notice

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: 93577673102

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4.5 ★★★★★
Based on 19 reviews
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A
Verified Purchase
Amazon Customer
Whiting, US
★★★★★ 4
Perfect to stop leaks or stains
Size: Twin, Color: White
This is a wonderful mattress protector that gets the job done. It absolutely prevents stains from leaking through to the mattress. The only thing I don’t like that could be improved is the size and lack of snug fit. It moves a lot but still does the job and is not too hot. It’s very soft and comfortable. Would be 5 star if it had a snug feature or bands to fit under the mattress. Worth it for the price and is long lasting.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2025
A
Verified Purchase
Amazon Customer
Dallas, US
★★★★★ 5
Perfect Mattress Pad
Size: Full, Color: White
Light and fluffy with no noise of a waterproof layer. Excellent mattress pad. Thank you.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 2026
P
Verified Purchase
Pyr Lover
Charlottesville, US
★★★★★ 5
Beat Mattress Protector yet!
Size: Queen, Color: White
This is the ULTIMATE bed protector I’ve bought in MANY years! Fits SUPER deep mattress. Has a nice thick fill. Doesn’t have any crinkle sound when you move nor makes you feel “hot” either. Literally waterproof also definitely works at keeping mattress protected especially against a huge amount of water poured on top! Washes and dries well in the dryer without shrinkage or losing any lot or waterproofing. Don’t use any bleach or softener or dryer sheets. Fantastic but and HIGHLY recommend! Doesn’t shift on bed either. Has full elastic type mesh ALL around the side of mattress that goes underneath to hold firmly in place. Order size of actual bed even if you have extended height mattress.
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Reviewed in the United States on July 5, 2025
P
Verified Purchase
Paige C.
Chelsea, US
★★★★★ 5
Great fit, good added comfort, long dry time
Size: Twin, Color: White, Size: Twin, Color: White
I got the regular twin size for my toddler’s bed. Before, he had a yellow foam topper (one of the cheap ones) and a mattress protector that barely stretched to the bottom of the mattress. I LOVE that this is such a deep fit so I didn’t need to worry about it coming up a lot. We have a standard size twin mattress. For breathability, it does seem like it might trap heat- it is very warm to lay on the mattress now, but that doesn’t bother us. It is comfortable to lay on the mattress. I don’t think it is as thick as the foam topper we had, but that was expected. For a waterproof topper, it’s a pretty good fluffiness. Washing: Hours fit in our washing machine fine. However, I did have to dry it three times. You can’t dry it with anything else or whatever else is in there gets bundled up inside it. I didn’t take a star off for this because we generally have to run loads a second time in our dryer anyways, and it might be because of the weight that it takes longer to dry. overall, I am happy with the purchase! My toddler’s bed is much more “in place” with the sheets, it’s still comfortable and the cost is worth the money to me.
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Reviewed in the United States on September 13, 2024
I
I heard it on the grape v
West Palm Beach, US
★★★★★ 5
Get your comfy on
Color: Black, Size: King, Color: Black, Size: King
This Bedsure King Mattress Topper - Viscose Made from Bamboo: This ultra-soft, thick, and fluffy pillow top mattress pad is made from bamboo and is 21 inches deep with a breathable, moisture-wicking design. It’s available in black and measures 78x80 inches. While it’s a great choice, it does take a bit of time to be able to use when you first receive it. First, you need to remove the packaging and then put it in the dryer on low fluff for 20 minutes. After that, you should lay it across your bed for 24 hours to allow it to expand fully. So, plan on not being able to use it for 2 days. However, following these instructions will ensure that you get the best ultra-soft thickness and the perfect fit for your bed, plus you’ll feel comfortable when you’re ready to sleep on it. This Bedsure King Mattress Topper is incredibly comfortable. You’ll have the best nights’ sleep of your life with it. The quality of this topper is exceptional. I washed it, dried it, and it still came out perfect. There were no clumps or bunching. It laid out perfectly on our king bed mattress. This thing feels amazing. I didn’t want to get out of bed. Being a coffee addict, I didn’t mind not having it first thing in the morning because it’s so soft. My husband even approved of this topper. I like how both of lying on it, I don’t feel him moving around. This Bedsure King Mattress Topper is not too soft that you sink in. It’s just right. It’s like a soft hug on your body, but not wrapped around you. After a few days of sleep on it, my back didn’t hurt. I was surprised. I also like how this topper helps protect and keep your mattress from wearing out quickly. It provides long-lasting stability to your mattress. This Bedsure King Mattress Topper is the perfect thickness. I love how my sheets still fit over this and my mattress with no problems. The topper stays put on my mattress also. I like the added elastic band for support keeping it in mattress. We just bought a new mattress and I wanted a topper to add more comfort so this was a perfect addition. Ive bought other Bedsure items for our condo, we rent out and guests always like those toppers. This the first time getting a single topper with no memory foam added separately. I have to say I like the added comfort this Bedsure King Mattress Topper - Viscose Made from Bamboo Ultra Soft Thick Fluffy Pillow Top Mattress Pad with 21 Inch Deep Pocket, Breathable, Moisture Wicking, Black, 78x80 Inch adds to our mattress top. It’s just the right added comfort. You can’t see the wording Bedsure through sheets either. I get do my stretches in bed, yoga and still able to do with no problems. The price is spot on for a nice quality mattress pad. Definitely highly recommend getting this for your mattress. You will be glad you did. It will last a long time.
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Reviewed in the United States on May 19, 2026

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