Avalon Acoustics Sentinel - Manual (Page 22)

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3.4 The Felt Anti-Diffraction Mask
The anti-diffraction masks are installed at the factory, and fit within the
recesses on the cabinet face. It is very important that the felt mask make
physical contact with the face of the loudspeaker, as air space between the
felt and the speaker face will adversely affect sound quality.
Orientation of the upper Felt Mask
Should the felts come loose from the cabinets during shipping, remember to
reinsert them, as they are critical to loudspeaker performance. The upper felt
is beveled around the openings for the tweeter and midrange drivers. Be sure
to note the correct inside-outside orientation when installing it. The driver
openings are beveled on the side that faces the listener (away from the
speaker). Figure 3.7 displays the proper installation. Apply gentle pressure to
the felt where it touches the adhesive tape strips, while taking care not to
damage the transducer diaphragms.
WARNING: The transducer diaphragms are very fragile and are easily
damaged. Do NOT touch the diaphragms while positioning and installing felts.
Figure 3.7 – Proper orientation of the upper Felt Mask.