I recently did just that. I hated the big, multi-tiered, dust collector of a TV stand and trying to clean the speaker stands and the floor underneath.
So I went to Home Depot and got 8 -1/2 inch floor flanges, (4 for the speaker wall mounts, 4 for the glass shelf, 2- 8 in by 1/2 in nipples, and 2-1/2 in
street elbows and a couple of pcs. of 5/8 maple (about 6 by 7). For the shelf I mounted 4 of the flanges on the wall and cut 2-36 in by 1/2 in nipples
(there's that word again, giggle) to length. About 14 in for my use. The reason I needed 4 was because I was to cheap to buy a 4 ft by 14 in piece of
tempered glass and I found a pkg of 2- 14 in by 24 in tempered glass shelves @ Ikea for $15.00. Cleaned and painted all the parts. Even found little
chrome plugs that fit the front showing ends of the nipples.😆. Put the little self stick baby buggy bumpers all over. Easily strong enough for my RB 61ii's.
Total cost including the TV wall mount about a hundred bucks.
Oh- #10 screws for those flanges.