When I got my SL1200G turntable, I listened both ways, with the cover open or closed using the same record. After about 10 try’s, I found the open position better and go with that now.
Turntable lid up or off?
My Pro-Ject Classic turntable came with a dust cover. I usually spin vinyl with the cover completely removed and never closed. Does it matter if the cover is just up or fully removed? The ultimate test is just listening, but I cannot detect a difference between either mode (up or completely off).