Can this be used with downfiring sub?

Yes. I use it with a REL T9/i Works a treat.

My downstairs neightbours complain about the bass on my onkyo subwoofer. Will this help eleminate the sound to them if placed underneath?

It definitely won't eliminate the sound, but it might help, depending on which sub you have. A downfiring sub may be the worse, front firing shouldn't aim at the walls/corners.. You might have a setting on your AV amp to EQ sound depending on the time of day, my Denon has Daytime/Evening/Midnight mode which curtails it somewhat

what is it's weight capability?

Mine houses a very heavy 18" sub in a box which is 5" wider than the Auralex, - not sure how heavy my sub is (25kg maybe), but the Auralex copes no problem

can I put on that XT8F ?

I can't see a reason why not. You can buy pads for floorstanders in pairs. Maybe a more economical option with the same results.

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Auralex II ISO Series Acoustic Decoupling 4,5 x 38 x 38 cm black/charcoal

Product ID: 75349783

Details

Audio output mode
Stereo
Brand
Auralex
Connectivity technology
XLR
Frequency response
1000000 MHz
Material
Foam or
Model name
Subdude II

🎵Enhances subwoofer clarity

🔇Dampens structural vibrations

🛠️38x38x4.5 cm precision size

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Description

🎧 Elevate your bass game—feel the difference, not the vibration!

TRUSTED BY EXPERTS - Join thousands of sound pros who rate it 4.6/5 for elevating their audio experience.
VIBRATION FREE BASS - Decouples your subwoofer from the floor to eliminate unwanted rumble and distortion.
CRYSTAL CLEAR LOW END - Transforms muddy bass into a clean, accurate low-frequency response that audiophiles crave.
SLEEK ACOUSTIC DESIGN - Compact 38x38 cm footprint fits seamlessly into any professional or home studio setup.
PRO GRADE SOUND CONTROL - Reduces coloration for a truer soundstage, making every beat and note pop with precision.

The Auralex II ISO Series Acoustic Decoupling pad (38x38x4.5 cm) isolates your subwoofer from floor vibrations, reducing coloration and muddiness to deliver a cleaner, more accurate low-frequency sound. Designed for professional and home audio setups, it’s a must-have for anyone serious about pristine bass performance.

Specifications

ASIN	B00DI5AXNI
Antenna Location	For surround sound systems
Audio Driver Size	15 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	19,152 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 365 in Acoustic Room Treatment
Box Contents	SubdudeV2
Brand Name	Auralex
Colour	black/charcoal
Compatible Devices	Smartphone, Tablet, MP3 Player, Desktop, Television, Projector, Laptop
Connectivity Protocol	Bluetooth
Control Method	Touch
Customer Package Type	Standard Packaging
Customer Reviews	4.6 4.6 out of 5 stars (943)
Enclosure Material	Foam or similar acoustic material
Frequency Response	1000000 MHz
Global Trade Identification Number	00818105008476
Is Waterproof	False
Item Dimensions D x W x H	38D x 38W x 4.5H centimetres
Item Weight	2.27 kg
MP3 player	No
Manufacturer	Auralex Acoustics
Maximum Speaker Output Power (in watts)	25 Watts
Model Name	Subdude II
Model Number	SubDude v2
Mounting Type	Tabletop Mount
Network Connectivity Technology	XLR
Number of Audio Channels	2.0 (stereo)
Number of Items	2
Power Source	Battery Powered
Product Features	Lightweight
Series Number	2
Speaker Size	15 Inches
Speaker Type	Subwoofer
Specific Uses For Product	Desktop surround sound systems
Subwoofer Connectivity Technology	Wired
Subwoofer Speaker Diameter	15 Inches
Tweeter Diameter	1 Inches
UPC	818105008476
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology Type	No Wireless Communication Technology
Woofer Driver Diameter	15 Inches

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B/.592

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In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Panama.

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