I currently have Monitor Audio 3i "Book shelf" monitor speakers at this time and run them on a Dennon POA 2400 Amp. They get a little fatiguing after a while and I must watch the volume to keep it lower than where the sound starts to become improved in midrange and bass response (they have a 5" midrange and 1" dome tweeter, dual front ports). I'll notice a slight inner ear discomfort and slight ringing if I don't keep the volume lower(after listening for a while, piercing highs). They sounded better after break in, however, they are still bright sounding and need a slight more mid-range and bass sound (more balanced, however, I realize they are small speakers and I can't expect but so much). I have the "there's something better" bug and realize I must spend more money and go hunting for better speakers and think more on some room treatments (I have reflective sheet rock walls, carpet floor). I am 44 years old now and realize my hearing has changed some and my desire for a more full and richer sound has increased (more mid and lower register musical balance). I'm changing out the entire system. Thank you very much to you who have responded thus far and I welcome more input and recommendations.