Yes Manos I agree. It's important to have a good amp, cd, TT, cables, speakers, electricity and other acesories improving sound.
But I think it's not right to ask: Audio equipment or room treatment.
You put CD to CD Player then by cables it goes to DAC, then to pre then to monoblock then to speakers AND then it comes from you speaker to your ears. All of this contribute to the sound of which we hear. But this last section (acoustic) is often overlooked.
My experience in based on basic audio systems from 1.000 to 10.000 Euro. I'm visiting Audio Show and listen to hi-end but on shows it's all quickly plased, often in empty rooms, complete with orher audio that distributor sells so it's no synergy in those systems, and it does't play well. Maybe sometime I will came to you to listen hi-end systems that are perfectly well selected and hear what it's all about. For now I have to finish my studys, start my company and educate Polish audiopiles that acoustics is also important.
BTW: I konw that earning money by doing what I like will be very good, but I didn't think that it will be also funny. The biggest fun I have when someone that want's to try diffuser thinks that it will make small difference to what he hear, but when he listen to music with some acoustic panels/diffusers he makes big eyes and can't believe that it works and provides bigger improvement that he thinks it will :)
Unfortunately it will be near impossible to employ such room treatment techniques in a home environment.
Why? Because only few wifes will accept that in home?