My experience was the same as Ejlif, but in my case I went from HT AC-11 to Powersnakes Cobra. I wonder how much better is the King Cobra.
Biggest Sonic Improvement
What is the biggest sonic improvement you have ever made to your audio system. Mine was a surprise to me. I replaced my Audioquest PT6 tonearm on my VPI turntable with a VPI JMW Memorial tonearm. The improvement in the sound nearly knocked me off my feet. I never realized a tonearm coud make that much difference in sound. How about some of you guys, what has your most exciting improvement been.