Insulation around ceiling speakers

I'm planning on installing a couple RC80i speakers in my bedroom ceiling. Above the bedroom is an attic. I'll have access to the top of the speakers in the attic area. Right now there is just fiberglass insulation up there. After I install the speakers, what should I have around the speakers in the attic area? Should I just put the insulation right over the top, or leave the speakers uncovered, or build some sort of box around the speakers? If the latter, what size box?

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