In walnut, the variations in acoustic properties are particularly large. One could say that the timbre of walnut lies somewhere between rosewood and maple, with a pleasantly unobtrusive neutrality.

Sebastian Stenzel: Tonhölzer

Walnut is exactly the right color for a guitar. My opinion, of course. Even the plain stuff is pretty, and figured walnut is my favorite wood. It machines wonderfully, bends like a dream (except the unpredictable fiddleback samples), is easy to finish and makes a nice, light guitar. Claro walnut from the West Coast states seems to be more reliably figured than the more common black walnut, though they work much the same. I once helped take down an English walnut tree and was given half the trunk. The texture was finer and the pores smaller than American walnut, and the color was that of creamed coffee. I wish that I had a truckload of it. Walnut even smells like perfume to me. I like it.

John Calkin: The Heretic's Guide to Alternative Lutherie Woods

Heavy koa, mahogany and walnut are all comparable in their tone. Everything else being equal, it is generally recognized that mahogany and koa will produce a „warmer“ sound in a guitar than the more brittle rosewoods can.

Ervin Somogvy