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

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

$8955.00 $9950.00
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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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4.0 ★★★★★
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Verified Purchase
❤️RAWR-RAWR❤️
Phoenix, US
★★★★★ 5
⭐ DaVinci Gourmet Classic White Chocolate Syrup Review
Flavor Name: White Chocolate, Size: 25.4 Fl Oz (Pack of 1)
The DaVinci Gourmet Classic White Chocolate Syrup is a must‑have if you love café‑style drinks at home. It delivers that rich, creamy white‑chocolate flavor without being overly sweet, and it blends beautifully into both hot and cold beverages. Whether you’re upgrading your morning latte or adding a touch of sweetness to desserts, this syrup is incredibly versatile and delicious. 🍫 Why This Syrup Stands Out Smooth white‑chocolate flavor: Creamy, mellow, and perfectly balanced — not artificial or overly sugary. Great for hot & iced drinks: Mixes easily into lattes, iced coffees, frappes, hot chocolate, and even milkshakes. Barista‑quality texture: Silky and consistent, making it easy to drizzle, blend, or layer. Large 25.4 oz bottle: Plenty of syrup for daily use, entertaining, or experimenting with new recipes. Versatile beyond drinks: Works beautifully in baking, frosting, oatmeal, and dessert toppings. ☕ Perfect For Homemade lattes and cappuccinos Iced coffees and cold brews White‑chocolate mochas Dessert drizzling Smoothies and milkshakes Holiday drinks and creative recipes It adds that cozy café sweetness without overpowering the drink. 🔍 Things to Keep in Mind Because it’s a classic syrup (not a sauce), the flavor is lighter and more mixable — great for drinks, but those wanting a thick drizzle may prefer a white‑chocolate sauce. A little goes a long way, so start with a small amount and adjust to taste. ⭐ Final Thoughts The DaVinci Gourmet Classic White Chocolate Syrup is a creamy, smooth, and incredibly versatile addition to any coffee or dessert routine. It elevates homemade drinks with a professional touch and adds just the right amount of sweetness. If you love white‑chocolate‑flavored coffees or want a reliable syrup for everyday use, this bottle is an excellent choice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 24, 2026
M
Verified Purchase
⪨MIND ⪨⪨🎵⪩⪩ PRIME⪩
Lake Worth, US
★★★★★ 5
✪ DaVinci | Gourmet Classic Vanilla Syrup: Great Flavor, Uses Cane Sugar, Great Price...
Flavor Name: Vanilla, Size: 25.4 Fl Oz (Pack of 1)
✪ DaVinci | Gourmet Classic Vanilla Syrup, 25.4 fl. oz. (Pack of 1) _____________________________________________________________________> ♦♦ Vanilla Syrup: ● I wanted to reduce the amount of flavored coffee creamer that I normally use, so I thought I would give DaVinci syrups a try. This was the first time that I tried and used the DaVinci brand. ♦♦ Coffee Time: ● I used about half of the coffee creamer that I typically use and I added a teaspoon or two of DaVinci syrup to my morning coffee. I gave it a good stir, then took a few sips and there was plenty of flavor for my liking and it seemed to have a rounder and had more of a vanilla like taste when comparing it to the vanilla flavored coffee creamer that I normally use, I definitely enjoyed the result. ♦♦ Great for Other Uses: ● I also tried this syrup with other drinks such as soft drinks, cola, orange and root-beer, and a smoothie. All of them of them were very good, indeed. Give it a try. ● I also added some to plain yogurt and some other foods and they all tasted really good as well. ♦♦ Ingredients: Cane Sugar, Water, Natural Vanilla Extract with Other Natural Flavor, Sodium Benzoate and Potassium Sorbate (preservatives), Citric Acid, Caramel Color. ✪ Pricing: $6.88 / 25.4 fl. oz. ● A very affordable price for it's size, especially when compared to other brands that I've had before. ✪ SCORE: 5 Stars > ⭐ ⭐ ⭐ ⭐ ⭐ ♦ ✪ ♦ Over-All: ● I most definitely liked the results that I got when using DaVinci flavored syrup with my coffee, soft drinks (soda) and even food. As affordable as it is I would recommend checking it out and see what you can come up with. I would buy it again. ______________________________________________________________________>
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Reviewed in the United States on April 17, 2026
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Verified Purchase
Nicholas
Draper, US
★★★★★ 4
Comparing to the coffee giant version
Flavor Name: Brown Sugar, Size: 25.4 Fl Oz (Pack of 1), Flavor Name: Brown Sugar, Size: 25.4 Fl Oz (Pack of 1)
Starbucks comparison (from a personal standpoint): I’m fortunate enough to have a bottle of Starbucks Brown Sugar. Problem is, I’m almost out. Looking around at some alternative options, and reading the reviews- I see some saying this is a good substitute. Because I happen to have the syrup on hand, I figured I should see if it is, because it would be great given the low cost of DaVinci syrup. This picture I’m attaching is just to see the color difference. Consistency wise, the DaVinci syrup is much lighter, more runny. The Starbucks is definitely a thicker liquid, that runs much slower. Flavor is the big one: DaVinci is lighter on taste, and sweeter. The best way to describe the flavor is comparing DaVinci’s to 100% real maple syrup that’s been diluted down with water. It’s good, but not really similar (in my opinion) to Starbucks Brown Sugar. Starbucks is more smokey in flavor, more strong/bold. My drinks are made using espresso, oak milk, cinnamon powder, and ice. I made my drink the same way, but used DaVinci Syrup this time. I found that the same amount of syrup that I use for the Starbucks, didn’t feel like it had a strong enough flavor. What did I do? I added an extra ounce of DaVinci hoping to get a stronger flavor. The problem is, DaVinci is more sweet than the Starbucks syrup (in my opinion) and ended up making my drink taste too sweet. It’s sweet enough that I’m not going to finish drinking it. I’m not knocking the DaVinci syrup itself. I think it’s a good brand and a good flavor. It’s just not the flavor I was hoping would solve my issue for a Starbucks imitation. I would encourage anyone to still try this syrup, but do so to enjoy it for being its own flavor.
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Reviewed in the United States on January 18, 2026
M
Verified Purchase
Mona S
Lake Worth, US
★★★★★ 5
Tastes Like Banana Pudding and Dunkin Banana Flavor!
Flavor Name: Banana Bread, Size: 25.4 Fl Oz (Pack of 1)
I don't know why someone would buy this expecting it to taste like real bananas like come on ppl lol. The only way to attain a syrup that tastes like real banana bread is to make it at home. This is an artificially flavored syrup so obviously it tastes that way! I have made banana bread syrup (more like a sauce) at home and it is delicious, highly recommend!! But this is way more shelf stable and tastes amazing in an iced latte as well! Different than home made but still good. To me this tastes like banana pudding mix which also has a fake banana taste. It also tastes EXACTLY like the new Dunkin banana flavored syrup which is what I was looking for! I use 1.5 tbsp syrup, a little vanilla paste, 2 espresso shots and 2 percent milk with plenty of ice. I like keeping my latte calories below 200 and not super sweet tho so you can up it to 2 tbsp. The cals in this are not terrible, 70 cals for 2 tablespoons. Usually my syrups have 50-60 cals for only 1 tbsp so I'm pleasantly surprised this is a little lower. I bought a second bottle because I'm afraid this is a limited release lol.
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Reviewed in the United States on April 1, 2026
E
Verified Purchase
Emma
Belleville, US
★★★★★ 5
Delicious
Flavor Name: Coconut, Size: 25.4 Fl Oz (Pack of 1)
Delicious coconut syrup. This has upgraded my morning coffee beyond words. Better than store bought lattes. Great price point. My summer go to coffee upgrade
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026

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