Where can I start to improve my sound the most 2ch

"I would rather listen to two channel music being a recording studio guy."

As a recording studio guy I want you to think about the surround information that every stereo cardioid mic captures and explain to me how you remove the surround information off of your mixes.

Yes... buy a better CD player to run through a noisey AV receivers after thought of an analog preamplifer then use that same preamp to drive an amplifier that cost what the receiver cost.

If I may ask a favor,

If given a chance I can make your 2 channel cd's sound significantly better than the do (it still may not be good enough) now by using DPLII on the Arcam, Especially since you bothered to buy the right speaker system. It will only cost you a bit of your time, so what do you have to lose?

Email me if you're willing to suspend disbelief for a moment and I can talk you through how I setup receiver surround systems to playback 2 channel music.

Cinematic_systems
Stop the advertising and leave it your website. If you want to sell this gentleman private emails are more appropriate.

Amp would be next after the CDP. Think tubes..........

Upgrade the CD player.

Room acoustics is very important. It will make more difference than cd players, wire or any ss electronics. Without good acoustics you're not hearing your system as well as it could sound and this is commonly quite an ear opener. For the money it's a bargain compared to what many of us have in our systems. Bass traps can other room treatment can be made rather inexpensively too. I'm sure many of us here would like to hear what you think after you get some room treatment. Fair warning: Once you start and hear how much better your system sounds it's hard to stop.