Best Stereo Upgrade Value


A question for you audiophiles...

What "upgrade/change" has singularly given you the biggest (not incremental) improvement to your stereo system?  Upgraded amp, pre-amp, tubes, room correction unit, subs, connectors, cables, speakers, streamer, stylus, speaker placement, acoustic panels, etc.?

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Speakers will always make the biggest change in sound.  Things like cables, very minuscule with some exceptions. 

To be sarcastic, it all depends on how much you spend.  We all know the Price is always Indicative of Quality and Performance.

Just kidding.  Happy listening folks.