Ive tried a bunch and you truly want to hear a differance and possibly its a placebo effect but the two tweeks I done and without a doubt knew it was better was changing out the patch cable 5e from my Router/gateway to my streamer Node2I to a Linkup Cat8 22guage for $34. then I would say I did notice an improvment when I made a DIY Mogami speaker cable it definitely had a more refined sound and I want to say the IFI acPurifier does help outside of that I had high hopes for others like iso acoustics solation pads , interconnects and a few others and it didn't really blow my skirt up. Im a huge believer in putting some money in the source streamer- upstream , Garbage in Garbage out . Im thinking about getting liner power supplies for my router and my streamer now and possibly a galvanic isolator for the ethernet , maybe something was wrong with my old 5e patch all along who knows , Im moving on. 1 absolute must is acoustics , I wrapped my entire room with a track curtain that has sound deadening material and that without a doubt is the best thing you can do to remove echos and get more detail from your current setup.