Make equipment changes, cable changes, room treatment changes, etc one at a time and allow yourself time between them to fully experience what they may or may not have wrought. All changes are not necessarily good ones, which is why other poster's advice on return policies is key.
And rather than reject other's observations out of hand, try things like checking whether or not you can hear directionality in cables and fuses, whether changing speaker positions finds a better spot, or even if burning in new equipment makes a difference you can hear. These cost nothing but time, and who knows, might be the biggest bang for the buck you ever heard.
And rather than reject other's observations out of hand, try things like checking whether or not you can hear directionality in cables and fuses, whether changing speaker positions finds a better spot, or even if burning in new equipment makes a difference you can hear. These cost nothing but time, and who knows, might be the biggest bang for the buck you ever heard.