Dear @chungjh : I think that main differences could came from two items: cartridge and phonolinepreamp.
The Skala is superior to your Denon that you can change it for a Lyra Kleos and due that I never listened the phonolinepreamps you own but I know very well Spectral then through your electronics you can improve what you are achiving rigth now and one option for overall electronics could comes from Pass that by coincidence you already own at your system’s amp. Maybe could help too to make an internal tonearm rewiring.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
The Skala is superior to your Denon that you can change it for a Lyra Kleos and due that I never listened the phonolinepreamps you own but I know very well Spectral then through your electronics you can improve what you are achiving rigth now and one option for overall electronics could comes from Pass that by coincidence you already own at your system’s amp. Maybe could help too to make an internal tonearm rewiring.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.