I bought some Old English with lemon oil for my Carver ALS Silvers. I think they're solid oak. They're in excellent condition but I thought it would be a good idea to treat the wood. For years I used Liquid Gold on my JBL L100s that I bought new in the 70s and they still look great. My older son has them now and still uses Liquid Gold on them.
They are oak veneer finished with a clear coat, in this case lacquer. As such you cannot treat the wood as the lacquer will not allow what is nothing more than an oily (refined petroleum oil) mineral spirits solvent with lemon scent (no lemon oil) added to penetrate the clear coat. That product simply sits on the surface and evaporates within a few days. Bottom line, it's a complete waste of money and time.
According to the Carver owner's manual there are two versions: genuine oak & black lacquer
"Genuine Oak Model": Your speakers are finished with a natural oil and may be treated like any fine furniture. We suggest occasional cleaning/polishing with a fine furniture oil or cleaner such as Pledge.
"Black Lacquer Model": The speaker panel is finished in high quality polyurethane acrylic enamel which is as durable as it is beautiful. The high gloss finish requires approximately four to six weeks to final cure. With proper care, the finish can be maintained almost indefinitely.
The finish is similar to that used on fine automobiles, and should be treated accordingly.
It then gives some additional warnings pertaining to exposure to sunlight etc. It also goes on to explain that these lacquered panels are constructed of high density composite material which can be dented, gouged, or chipped with sufficient pressure. Scratches and gouged, however can often be successfully removed. Use either a soft cloth our a commercially-designed cloth for all polishing, waxing and cleaning. Other materials may scratch the finish.