Have you seen a sub set up like this? Can it work?

I want to take 2 sealed sonos, each with 5" legs and .75" edf bases and turn one upside down and place the other on top of it. DIAGRAM BELOW

This would leave the bottom sub about 2.5 feet off the ground, then the 5 inch legs of one and its base going into the base of the other followed up its 5 inch legs. The two woofers would be about 1 foot apart aimed at each other.

To keep the two bases from sliding apart with vibration I would use some sort of rubber matt or feet.

Will this cause cancellation?

Would it be better to stack them both facing down (one into floor, one into the other)

NOTE: They are already built just need help aligning them.

Mine WILL NOT be stable ha.

I had a permanent port flair attached to the port hole, I had to cover it. The vinyl and plywood I used are over a flair that has a lip outside the tube. All this combined and you are left with 2 squares of slightly curved plywood meeting in the middle. they can be pushed a bit and dont fall but they wont sit flush, dont line up in the center (dont form a perfect cylinder) and look ugly with the gap in the middle.

I really dont want to stick them together permanently to make it stable.

They absolutely have to be stacked and I can't o[erate a saw to make a circle - They are build with the port flair still in the hole and plugged up.

I can take a picture tomorrow. Really It is more the look of it. The plywood/flair/plug back to back create about a 1 or2 inch gap that you can see 2 big ugly squares in that dont match the way the subs are designed.

Here are picture of the challenge I an facing - The photos show the plywood MUCH clearer than it is in person because of the flash but it does not show how the do not sit flush to each other because of a gentle curve to each.

Would some form of rubber anti-fatigue or anti-vibration mat offset some of this and keep them from shifting over time?

Those are the pointing up and down (ceiling/floor)

If you look at the close up the two ugly plywood pieces are not flat. I was thinking some sort of rubber sheet in between like a fatigue mat for friction

Sorry if I took it wrong, are you telling me to throw in the towel? ha

Because of the shadows you dont see the plywood TOO much.

I have a couple ideas:

1. put a thin rubber on each piece of woode then paint the edges so everything is black

2. Go to a car show and find some black faux leather/ faux chrome thing and put it around.

I want to avoid anything too bright because I planned to keep it black and Rosenut. My gf stained rosenut trim to put around the top and bottom seams to cover the glue and add a pop of color.

Also take into account I will be adding 6 more inches to the top. I am still going to use the legs and base provided but will find 1/2" longer hex screws and have the floor plate inverted so you see the gloss pain at eye level.

I will post pics of that but just seeing if the additional top weight matters.,

Yes as I tried to explain above. My ineptitude lead to some sacrifices being made.

when you push the top one it wabbles but it would take an effort to push it off. I am worried about slow vibration over time, as you know it can just hit a breaking point and go sliding off

Here is the super close up.

Notice the slight curve AND how they don't line up left/right. I had planned on gluing it together but I realized that working on it in the future would be too hard and I could never separate them if I got a bigger room

The plywood has multiple layers on pl premium and wood screws plus it plugs a 12" port hole - there is no way to remove it.

Aesthetics are not worth that. I have ZERO handy skill, I didn't cut any of the wood ect.

What about the idea with rubber or maybe some rubber feet on the board?

I jsut want to make it stable - I can fix the look of it in a number of ways Actually separating them just a bit with some isolator feet might be cool looking if done right.