Fumigation

Were did you get those speakers, from the jungles of Africa? Seriously, I would be concerned about the fumigating chemicals depositing on the drivers, crossover and wires which might have a long-term deleterious affect.

Why do you think you have wood warms?

If you fumigate with Vikane, you are probably OK. But check with the fumigators.

If you think you've wood boring insects, get the speakers out of your house before the rest of your furniture gets infected! If they are in your speakers, they may be elsewhere in your home. How long have the speakers been in your home?