Costing absolutely nothing but time and effort, experimenting with loudspeaker and listener positioning can produce very positive results. If you want to spend money you could look at isolation/resonance suppressing devices such as racks and footers. Finally have you thought about the Zu version of the Denon cartridge?
What to upgrade next?
If you wanted to make an upgrade which would be the next most noticeable improvement.
1: Power Cord (currently just stock cord)
2: Power tubes (currently JJ's 2 each 300b)
3: Cartridge (currently running Denon 103R)
My system consists of Audion Silver Night Special Edition 300b integrated, Acoustic Solid TT, Zu Soul Superfly speakers with Mission cables.
Rick
1: Power Cord (currently just stock cord)
2: Power tubes (currently JJ's 2 each 300b)
3: Cartridge (currently running Denon 103R)
My system consists of Audion Silver Night Special Edition 300b integrated, Acoustic Solid TT, Zu Soul Superfly speakers with Mission cables.
Rick