A deeper more holographic soundstage.

I don't know what kind of music you are into. However, Radiohead - King of Limbs is a live studio recording. It has some of the best ambience I've ever heard recorded. On an ambient loop system, it is incredible. 

I forgot to mention that it is on DVD.

A lot of good responses already, and many not so good.

In my 45 years as an active audio enthusiast, the biggest single improvement I ever got in soundstage openness, depth and clarity came from having an electrician install two direct runs from our home's breaker box to audio-grade sockets in my listening room. I have spent many thousands of dollars over the years without getting so dramatic an improvement. Cost in my house was $1,200, which is higher than most because it required a complicated run.

Close second was from upgrading the power cords on my equipment. A lot of flat-earthers think this is nuts, but the improvements are NOT subtle. If you're using stock cords and don't have much to spend -- or want proof before spending more -- I strongly recommend Audience's cheapest cord, the F3 at $149.

Compared to stock cords, you will not believe the improvement -- even in relatively humble systems. I got a non-audiophile buddy to buy one for his Sprout100 integrated amp, powering a $300 pair of Elac Debut B2 6.2 speakers, and he said it gave him at least 20% more depth, clarity and dimensionality, revealing much more of what was in the recordings.

And, BTW, an F3 absolutely killed a Pangea AC-14XL, same price.

I use higher-grade Audience cords in my main system, and the Front Row -- very pricy -- is so good I can't believe it. Can hear to the walls of the recording venues, hear the air around and behind the players/singers, much more 3D and much clearer, more focused bass.

This is NOT snake oil.

All this tells me is that you never addressed the acoustics if these were the biggest changes.

A lot of flat-earthers think this is nuts,

Do you kiss your Ted Denney statue before you go to bed? That statement is directly from his moronic Facebook echo chamber. I would be embarrassed to be a member.

The electrical embeddings dimension of the audio system implicate all electrical locations in the house, it is why new audio sockets and power cord among other things will work together for the better to lower the noise floor...

I use my own device at low cost to reach the same goal... (Adding the 2 methods would certainly be better tough )

All this tells me is that you never addressed the acoustics if these were the biggest changes.

But yes acoustical embeddings control are also one very important key, perhaps the more important but not the only one tough....Acoustical controls and treatment cannot replace, and give in S.Q. by itself only, what the electrical grid controls and the mechanical controls will add together in their own dimension to the global S.Q....

Then dont forget even the mechanical vibrations and resonance controls of your audio system they will improve  imaging, timbre and stage too...

I can hear what you hear relatively speaking with very low cost solutions....If i had the money i will do also your change(audio socket+power cord) adding these to my devices... But i am very satisfied at peanuts costs then....😊

Can hear to the walls of the recording venues, hear the air around and behind the players/singers, much more 3D and much clearer, more focused bass.

My best to all....