Everything's riding through IC's. I'd begin by selecting well-built, well-insulated "middle-end" IC's from a reputable audio company. Your ears will reveal if it's a musical system match, really capturing the system's synergy.
You may also order two or three different IC types and return your least favorite(s). I'd first try connecting the L/R main channels through different IC's and play your best-known test sources. The best system match may jump right out or be less dramatic but definately better.
I practice basic connections care that also definately helps. That includes cleaning all interconnects, keeping connections snug, using short cable lengths, pugging and unplugging carefully, and running audio cables separated from any power cords.
You may also order two or three different IC types and return your least favorite(s). I'd first try connecting the L/R main channels through different IC's and play your best-known test sources. The best system match may jump right out or be less dramatic but definately better.
I practice basic connections care that also definately helps. That includes cleaning all interconnects, keeping connections snug, using short cable lengths, pugging and unplugging carefully, and running audio cables separated from any power cords.