Class D has improved quite a bit over the last 10 years. Consider a newer integrated in either Class D or linear ranges.
I'd ask about bass traps, and room modes.
It could be you need not anything better, just different.
I don't know of speakers I like better than Wilson's. There are lots which will give you more "detail" or have a different bass/mid/treble balance.
B&W, Golden Ear (shiver), Dali are speakers that fall into this category.
Monitor Audio, Revel are pretty neutral as well.
You might want to go out and listen between them.
ESL's can be wonderful for their imaging, but lack in dynamic range and overall tonal balance.
As far as the room, have you added any diffusors, or are they all absorbers? They can add a sense of liveliness and balance.
I'd ask about bass traps, and room modes.
It could be you need not anything better, just different.
I don't know of speakers I like better than Wilson's. There are lots which will give you more "detail" or have a different bass/mid/treble balance.
B&W, Golden Ear (shiver), Dali are speakers that fall into this category.
Monitor Audio, Revel are pretty neutral as well.
You might want to go out and listen between them.
ESL's can be wonderful for their imaging, but lack in dynamic range and overall tonal balance.
As far as the room, have you added any diffusors, or are they all absorbers? They can add a sense of liveliness and balance.