I wouldn't say this is the fastest way but the better way for better gains and satisfaction: focus on acoustics of the room. period. Too many audiophiles tweak their systems with expensive cables, power conditioners, and even components and speakers. The biggest element in any system is the listening environment. One can spend far far less on acoustical treatment that would increase the sound quality of a room exponentially more than upgrading ANY component in their system. But it doesn't come with Bragging rights...just intelligence.
Fastest way to correct hifi system?
Just wonder what you think is the fastest and most hasslefree route to buy a hifi system which one are satiesfied with longterm? Call the nearest hifidealer and tell your soundsignature preferences, roomsize and the amount you will use, or read magazinereviews and internetforums etc. for months or years trying to find the perfect system money can buy? Or just go to the nearest town and listen to as many system combinations in your pricebracket as possible and try to figure out what is the best for you?