#1 Room treatment ! ( i use gik ) massive changes (this is a game changer!) Remember me when ya do it : )
Imo...one of the best intermediate interconnect and spkr cables are Acoustic Zen. You can score a set of shotgun satori used here .( i like getting used interconnects there broke in and if they dont mate well you can resell them.( i would buy them here ) changing my interconnects top to bottom to Matrix Ref 2 AZ was not sublte in any way .They were blind tests swapped to cheaper cables and the openess and bass changed dramatically.( tt to phono and to pre ,dac to pre etc ) all silver interconnects
I also run all AZ ac cables except for my mf nuvista ,i run the Revalation Audio Labs (psu etc for my nuvista outboard power supply and the precept 2 reference ac cable)
Again a used score will set you back a few hundred for AZ Tsunami 's
The interconnects will change the sound of your set up good or bad but it will change.
I have fought the fuse thing ,but i am getting the urge to try the black in my setup slowly lol
There are other things like recepticles like furutech and power treatment devices that have helped me but i am in a unique setup( fully offgrid) .check you ac in power (whats it at? does it vary? ) the tweeks and mods will drive ya mad lol
As for apple i have no idea i rarely play anything but vinyl, although i did play a cple cd's the other night.I switched back to vinyl ; )
good luck