Ok, so you already have the KLF-20's it sounds like.
Yamaha and Klipsch by many are not considered the best synergy combo and the Yamaha by many seem to say it is too bright for Klipsch. I think your biggest improvement would come from going with something on the lines of Rotel that many say goes excellent with Klipsch and leans slightly towards the warmer side that goes very well with Klipsch speakers. I would look into changing that side of things for the biggest improvements! You have great speakers with the KLF-20's and they are really hard to beat for even 2 or 3 times the cost. You have great speakers already. Look into a different amplication for largest improvements and if you want to take things from there later.... you could try updating the crossovers in the KLF-20's like Vman71 suggest if you feel you need the changes, just get Vman71 to list out in detail for you what changes you will hear of improvements and weigh them against what you are after in a speaker and see if it fits for you. Again, Good Luck! :)
Yamaha and Klipsch by many are not considered the best synergy combo and the Yamaha by many seem to say it is too bright for Klipsch. I think your biggest improvement would come from going with something on the lines of Rotel that many say goes excellent with Klipsch and leans slightly towards the warmer side that goes very well with Klipsch speakers. I would look into changing that side of things for the biggest improvements! You have great speakers with the KLF-20's and they are really hard to beat for even 2 or 3 times the cost. You have great speakers already. Look into a different amplication for largest improvements and if you want to take things from there later.... you could try updating the crossovers in the KLF-20's like Vman71 suggest if you feel you need the changes, just get Vman71 to list out in detail for you what changes you will hear of improvements and weigh them against what you are after in a speaker and see if it fits for you. Again, Good Luck! :)

