Dustcovers.. on or off...

Off.Not only does the dustcover create a collector for airbourne vibrations, it also adds energy storing mass to a sensitive system,creates a resonant chamber with its own panel resonance characteristics which obscures and smears information.The dustcover is one of the few areas where I am in disagreement with Regas Roy Gandy, the other being his dismal of the value of record cleaning.

Best,
Ken

dismissal
(i sure wish an edit feature were available)
ken

hmmm. are your floors packed dirt or clay? ;^)
seriously, if you take the record out just before playing and return it to its sleeve afterwards,very little contamination will result.
Use the dustcover or place an old beater record or mat on the platter when the table is not in use.
Ken