So many great tips. Ebarker2 advice is next to nothing in cost but great advice. Dedicated lines are not practical for many but if possible one of the greatest tweaks. Good quality
Outlets, keeping all connections clean, keep PCs and wires off one another. Keep components a reasonable distants from one another. Clean all fuses. Not fooling, in some cases this really works. If you do not have dedicated lines, Subaruguru's idea of turning off the fridge will surprise you. You may try putting small pillows in the corners of your ceiling. Drapes look good and in some cases can be a very effective tweak. Not a cheap tweak, but good racks/isolation devices are IMO as important as your audio gear. And as many have said and can't be said enough is speaker placement.
Outlets, keeping all connections clean, keep PCs and wires off one another. Keep components a reasonable distants from one another. Clean all fuses. Not fooling, in some cases this really works. If you do not have dedicated lines, Subaruguru's idea of turning off the fridge will surprise you. You may try putting small pillows in the corners of your ceiling. Drapes look good and in some cases can be a very effective tweak. Not a cheap tweak, but good racks/isolation devices are IMO as important as your audio gear. And as many have said and can't be said enough is speaker placement.