SKU: 26825796664

Ascendo ASC-24SPPS The24 SUB 24" PRO - Passive Infrasonic Sealed Subwoofer

Sale price$10350.00 Regular price$11500.00
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Description

Ascendo ASC-24SPPS The24 SUB 24" PRO - Passive Infrasonic Sealed SubwooferTHE 24 SUB PRO PASSIVE SEALED The24 SUB PRO PASSIVE SEALED infrasub is a statement. Its huge cone surface area and huge 90 mm of linear stroke represents a world record for cinema subwoofers allow it to move a gigantic volume of 10 liters of air per stroke to pressurise the room. Due to its ultra low resonance frequency and its sealed enclosure design the group delay is several times faster than the smaller 18", 15" or 12" subwoofers at the same

THE 24 SUB PRO-PASSIVE SEALED

The24 SUB PRO PASSIVE SEALED infrasub is a statement.

Its huge cone surface area and huge 90 mm of linear stroke - represents a world record for cinema subwoofers - allow it to move a gigantic volume of 10 liters of air per stroke to pressurise the room. Due to its ultra-low resonance frequency and its sealed enclosure design the group delay is several times faster than the smaller 18", 15" or 12" subwoofers at the same frequency. Also the acoustic power output per cubic inch is by far in favour of this unique design compared to stacked multiple smaller subwoofers.

Its ingenious design allows the The24 SUB PRO to produce frequencies in the infrasonic frequency range with authority, reaching down lower than subwoofers with a smaller diaphragm surface ever will. At the same time this infrasub renders those notes with much more power, structure and resolution.

The The24 SUB PRO ideally suits not only all types and sizes of cinemas, but also high-end stereo systems. Much of the spacial room information of the recording environment in a great audiophile recording is contained in the sub 30Hz audio band. You will hear more details in mid and high frequencies.

Specifications

Speaker type

24" forward-firing woofer, with dual 5" voice coil

Xmax

45 mm excursion each direction (90 mm linear), voice coil remaining in homogeneous magnetic field, linear and lowest distortion

Passive | Active

Passive

Recommended amplifiers 

2 Amp. channels are required. minimum recommended amplifier voltage swing:  2 x 109 Vrms, 154 Vpk, 27,3 A; equivalent to 3000W@4Ohms per channel, total 6000W with correct RMS & Peak limiter settings (up to 450V = 20kW peak)

Recommended ASCENDO amplifiers  

DSP4-10K2  

Principle

Sealed

SPL (Peak / half space 2 pi) 

Measurement data
140 dB @32Hz and up
120 dB @20 Hz
104 dB @10 Hz

Frequency range

"Measurement Data (without ext. DSP)
28 Hz - 500 Hz /   -3 dB
20 Hz - 500 Hz / -15 dB"

 Efficiency 

90 dB  / 1W/m

Power handling 

2 x 2500 W

Impedance 

Dual voice coil, 4 Ω each

Air volume displacement 

9,9 L / in comparison 18" standard cinema subwoofer 1,1 L

Directivity horizontal x vertical in Deg°

360°

Input terminal

Neutrik NL4 MP

Enclosure

Internally braced birch ply and MDF

Width 

29,53 " | 750 mm

Hight

43,31 " | 1100 mm

Hight with feet 

44,29 " | 1125 mm

Depth without grill 

19,69 " | 500 mm

Depth with plug

19,69 " | 500 mm

Weight

255,74 lbs | 116 kg

Finish 

Structural paint black

Custom colour options 

Piano lacquer, colour of choice, matt or other finishes upon request

Shape customisation 

Upon request 

Mounting 

Floor standing with feet

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: 26825796664

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DM
Belleville, US
★★★★★ 5
Best pillows!
Color: 01 - White, Size: Queen (2 Pillowcases)
Best pillow ever! Worth every penny. Very comfortable. Keeps its shape and supports my neck. I bought 4 of them.
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Reviewed in the United States on May 28, 2026
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MIXUPAGAIN
Louisville, US
★★★★★ 5
Worth the price.
Color: 03 - Gray, Size: Queen (2 Pillowcases)
Only on one side. I use with cooling pillow slip and it helps. I like the thickness and density compared to the pricey Columbia pillows. But Columbia has better outer materials and is cool on both sides.
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Reviewed in the United States on May 20, 2026
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Elaine
Charlottesville, US
★★★★★ 5
Recommend
Color: 01 - White, Size: Queen (2 Pillowcases)
Very good. My pillows were so old. Machine washable. Notice the name Beckham. Yes, it's really him.
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Reviewed in the United States on May 21, 2026
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Amazon Customer
Pawtucket, US
★★★★★ 4
they work
Color: 03 - Gray, Size: Queen (2 Pillowcases)
I've been searching for cooling pillowcases for a long time. None ever seemed to fit the bill until I found these. Now, let's be clear, they are cool to sleep on for a good amount of time, but you will have to flip them occasionally throughout the night to keep getting that cold feeling. All in all, as a person whose face runs hot when I sleep, these cases have made my nights more bearable, and I do believe they are helping with my skin issues. As far as good value for the money, I think they are a little costly. Color was comparable to the online photo.
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Gustavo M
San Leandro, US
★★★★★ 5
Good buy :)
Color: 03 - Gray, Size: Queen (2 Pillowcases)
Can’t go wrong! Silky and cool to touch. Love Beckham
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Reviewed in the United States on May 19, 2026

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