Screw size is likely 1 4 20 thread but double check with a thread gauge from a tap set or take your rubber feet to hd or lowes and use their thread board.
How to isolate floor standing speakers carpet.
There are plenty of spikes on e bay that are inexpensive.
Max said you should isolate your speakers and not spike them.
The carpet will decouple the speaker from the floor quite a bit while the stone provides a dense sturdy platform for the speaker to sit give it time to fully settle on thick carpet.
Looking for a cheap diy solution to isolate them from the floor thinking of sitting the speakers on a piece of slate and something rubbery underneath between that and the floor hopefully.
The spikes were also to make the speakers stable instead of having them wobble a little.
Maybe you hate the way audio speaker stands look.
Based on what i ve read if the floor is cement or tile covered with carpet or not it s best to couple the speakers with the hard floor using spikes direct or through the carpet.
The condo floor has a medium depth shag carpet i assume on a pad with concrete underneath.
Place the stone on the carpet then set up the speaker on the stone.
If stone is out then try baltic birch plywood.
Whatever the reason plenty of people place their audio speakers on the floor.
The material of the floor the type of sub and enclosure and firing direction of the sub etc all need to be considered.
Obviously 80 us or au is just silly for rubber feet but that doesn t mean the idea is bad.
If the floor is suspended and is covered with hardwood e g basement underneath second floor etc it s best to decouple using a semi hard material e g.
Spikes are only necessary if you have thick carpet and you want to stabilize the speakers plus raise them up a little bit.
Or maybe you re going for a college chic aesthetic with everything from your mattress to your tv on the floor.
Maybe you re scared your pets child will knock them down and damage your precious speakers.
How to upgrade your hi fi system or your audio equipment by successfully isolating from ground borne vibration 3hz and up.
Conventional wisdom had it that the spikes were to drain the vibrations from the speakers to the floor.
Several months ago after buying a pair of one meter tall 70 lb each atc two way active tower speakers scm19a i had a couple of guys from the local high end shop over to fine tune placement of the speakers.
The same principle applies to the floor in your home.