Avalon Acoustics Isis - Manual (Page 7)

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2.2 Installing the Grilles
The grille assemblies are behind a panel on the outside of the speaker crate.
Remove the screws securing the panel, and then carefully pull the grilles
straight out. The grilles are installed with friction fasteners and press into place
on the speaker cabinets. Please see Figure 2.2.
Orientation of the Felt Anti-Diffraction Mask
The grille assembly includes a felt anti-diffraction mask. Should the felt mask
be removed, be sure to note the correct inside-outside orientation when
re-installing it. The tweeter and midrange openings are beveled on the side
that faces the listener (away from the speaker).
Figure 2.2 - To install the grille assemblies.