Hi,
I use Totem speakers which come without grilles. Grilles, (for speaker protection only) can be purchased for a small upcharge.
When performing my due diligence prior to investing in speakers which (in my case) were going to be used for both a quality music listening experience, as well as (with the addition of other speakers to complete the Theatre part of the experience,) I cannot remember reading anything from manufacturers websites that I visited suggesting that grilles added anything positive to the listening experience.
Peter m.