Tpsonic is right. Nothing in the audio chain can be added later if it was not retrieved from the source. I would suggest getting the best source you can afford or justify and then go for the less important pieces later.
Every piece in the chain is important, but the source is the most important if one does not count the LP or CD from which the music is derived, but they are not technically part of the system.
Every piece in the chain is important, but the source is the most important if one does not count the LP or CD from which the music is derived, but they are not technically part of the system.