Fumigation

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?

First, back passive radiator's screw holes have thin wood dust in them. Strangly enough, those are the only spots I see traces of warms. Speakers are painted in black satin laquor.
Is there any way to deal with warms ather than fumigation?
Roy.

One way to see if you have something exotic in them is to seal then in a heavy-duty plastic bag. Leave it be for a while and then see what kind of dust might be getting thrown out by their activity. Also, sealing them in plastic will prevent further invasion to your home.

I would question your assumptions that there is something living in there. If you do seal them in plastic wrap some tissue paper around them at the base as whatever is coming out will be easier to see.

I would consult an expert keeping in mind that most pest control inspectors are only familiar with local bugs.

1. Remove drivers and crossover.
2. Take all the precise measurements of a speaker cabinette inside and out
3. Burn the speaker cabinettes either in fireplace(save an electricity) or do some BBQ over the charcoals.
4. Take the measurements to the carpenter and re-create speaker cabinettes.
5. Place back drivers and crossover.