Ummm not really sure, I find that if I have my iphone near the speakers, it causes crackling sounds, I think it interferes with the tweeter or something. You could try ferrite coils around the speaker wire, it might reduce the interference going into the speakers. Ferrite coils or cylinders are those lumps iin power cords, head phone leads etc.. You could get an old cable and cut out the ferrite cylinder then loop the speaker wire through it if the hole is not too small.
I once had an electric guitar and amplifier, if I stood too close to the amp, the amp would squeal, the same with a microhone too cxlose to the speakers or amplifier. I couldn't actually play the guitar, I just strummed bad chords until I got too many complaints from neighbours then gave it to my nephew to annoy his neighbours
Don't have the volume on high when you power on, increase the volume only when required for you to hear, turn off when not in use.
Don't have the speakers next to each other, keep them at least 12 inches apart, not near other electronics or phones or TV.