Which amp do you have?
I think the amp and the speakers will have to match to work really well. You could change both at the same time and sell your old amp but that might leave you less money for the speakers.
I also think the speakers will make a larger difference but if you are satisfied with your system you don't really have to do anything. What you could do is to find some used speaker or amp (or TT) you are curious about and buy that. Try it out for a few weeks and then sell it if nothing improved.
An amp that impressed me was the Abosolare Integrated but then you would have to let go of your preamp also. For speakers I like a number of Focal speakers, the Sopra 3 should be around $20k. The Boenicke W11 SE is also around that price.
I think the amp and the speakers will have to match to work really well. You could change both at the same time and sell your old amp but that might leave you less money for the speakers.
I also think the speakers will make a larger difference but if you are satisfied with your system you don't really have to do anything. What you could do is to find some used speaker or amp (or TT) you are curious about and buy that. Try it out for a few weeks and then sell it if nothing improved.
An amp that impressed me was the Abosolare Integrated but then you would have to let go of your preamp also. For speakers I like a number of Focal speakers, the Sopra 3 should be around $20k. The Boenicke W11 SE is also around that price.