Ascendo ASC-21SPPS The21 SUB Ascendo 21" PRO - Passive Sealed Subwoofer
SKU: 46561465479

Ascendo ASC-21SPPS The21 SUB Ascendo 21" PRO - Passive Sealed Subwoofer

Sale price$8955.00 Regular price$9950.00
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 5 - Jul 10

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Description

Ascendo ASC-21SPPS The21 SUB Ascendo 21" PRO - Passive Sealed SubwooferTHE 21 SUB PRO PASSIVE SEALED PASSIVE SEALED The21 SUB PRO PASSIVE SEALED is a jewel in the pool of subwoofers designed for the highly educated customer that is on the quest for the highest performance and understands how to differentiate sound quality. When this customer experiences the The21 SUB PRO PS unparalleled output and uncolored sound, the measured test results we publish translate perfectly to realized performance. ASCENDOs policy is to be

THE 21 SUB PRO-PASSIVE SEALED

  • PASSIVE
  • SEALED

The21 SUB PRO PASSIVE SEALED is a jewel in the pool of subwoofers designed for the highly educated customer that is on the quest for the highest performance and understands how to differentiate sound quality. When this customer experiences the The21 SUB PRO PS unparalleled output and uncolored sound, the measured test results we publish translate perfectly to realized performance. ASCENDO’s policy is to be completely transparent and publish measurements done by independently certified third-party labs to provide factual data, thereby enabling informed, educated decisions. The The21 SUB PRO subwoofer is so far above and beyond the competition in every aspect; refined musicality, tightness, and output levels suitable for a 21"" driver. It is also engineered to operate perfectly in sync (in phase) with our Infrasonic subwoofers; The24 PRO, The32 PRO, The50 PRO, The80 PRO when there is a desire to reproduce movie content below 20Hz with the same authority, precision, and musicality.

Compared to conventional subwoofer motor concepts, the ultra-modern double-gap motor of this custom-made 21" driver with two outer and two inner voice-coils enables more linear travel and much faster directional changes with higher sound power and significantly lower power compression.

Specifications

Speaker type

21-inch forward-firing, dual gap motor structure with 2 inner and 2 outer voice coiles, neodymium motor.

Xmax

18 mm excursion each direction (36 mm linear), voice coil remaining in homogeneous magnetic field, linear and lowest distortion

Passive | Active

Passive

Recommended amplifiers 

1Ch DSP + Amplifier are required. Min. recommended amplifier: 109 Vrms, 154 Vpk, 27,3 A; equivalent to 3000W@4Ω with correct RMS & Peak limiting & compression settings.

Recommended ASCENDO amplifiers  

(With additional external 1CH DSP: AIA2-6004), DSP4-10K2  

Principle 

Sealed 

SPL (peak / half space 2 pi)

Measurement data
139 dB @ 63 Hz peak 

Frequency range

Measurement data
55 Hz - 500 Hz / -3 dB
28 Hz - 500 Hz / -15 dB

Efficiency 

97 dB  / 1W/m

Power handling 

 4000 W

Impedance 

4 Ω 

Air volume displacement 

2,88 L / in comparison 21" standard cinema subwoofer 1,76 L

Directivity horizontal x vertical in Deg°

360°

Input Terminal

Neutrik

Enclosure

Internally braced birch ply and MDF

Width 

23,62 " | 600 mm

Hight

43,31 " | 1100 mm

Hight with feet 

44,29 " | 1125 mm

Depth without grille

14,57 " | 370 mm

Depth with plug

14,57 " | 370 mm

Weight

112,44 lbs | 51kg

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

 

The21 SUB PRO ACTIVE SEALED is supplied with a front cover as standard

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: 46561465479

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Free bird
Belleville, US
★★★★★ 5
Quality
Flavor Name: Mild, Size: 3.4 Fl Oz
Although it's on a pricey side but this black seed oil is very well packaged (amber glass bottle packed in the carton tube) to preserve the quality. The taste is mild, not upseting the stomach if taken on empty stomach. I can't attest to a very specific results but I am taking it for Inflammation due to autoimmune process. I feel better overall I my body (less to no no aches, stamina) but I am not sure if this oil is to thank
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Reviewed in the United States on June 17, 2025
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venisha
Boise, US
★★★★★ 3
seed oil
Flavor Name: Extra Strong, Size: 3.4 Fl Oz
Might be good for u but the taste is the worst
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Reviewed in the United States on April 29, 2026
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catherine valdez
Port Orchard, US
★★★★★ 5
Health benefits
Flavor Name: Extra Strong, Size: 3.4 Fl Oz
It’s supposedly good for cancer and other things so will see
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Reviewed in the United States on May 13, 2026
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Kayci Frederick
Phoenix, US
★★★★★ 5
Great vegan D3 with K2 combination
Size: 60 Count (Pack of 1)
Finally found something that combines vegan D3 with K2 in an organic form. The 5000IU dosage is potent and seems effective for bone support. I appreciate that it's plant-based and has high absorption, which feels like a quality supplement. The packaging is convenient, making it easy to take daily. Overall, a reliable product for maintaining bone health.
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Reviewed in the United States on December 18, 2025
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Anna
Waukegan, US
★★★★★ 5
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Size: 60 Count (Pack of 1)
Great Supplement for Bone and Immune Health! I’ve been taking NatureWise Vitamin D3 + K2 for a few months now, and I can really feel the difference. I chose this brand because it combines D3 and K2 — a perfect pair for supporting calcium absorption and overall bone health. The softgels are small, easy to swallow, and don’t have any aftertaste. I also appreciate that they use non-GMO ingredients and cold-pressed olive oil as the carrier, which helps with absorption.
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Reviewed in the United States on November 12, 2025

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