One of my suppliers located a nice 3/4" thick slab of 18" wide Ash hardwood.
They can be finished in either linseed oil / beeswax or stained walnut, mahogany or ebony.
Bases - 1 1/2" thick poplar - stained Ebony
I have them listed
here on my website.
Larger photo
here.
This is a one of a kind pair of speakers ... 18" wide hardwood is becoming hard to find .....
The only problem I can foresee with these baffles is if your listening room comes under attack by a swarm of Agrilus planipennis ...
Happy listening,
Randy