Recently added the Mapleshade Excalibur IC's to my system. My tubed phono stage has a pretty high output impedence, and my cables have all been Spectral/MIT, good buys used, but favor low impedence SS gear. Out of the box, the bass perfromace was immediate. Over hours, I just couldn't get away from my LP's until my wife came down to check on me. Was listening to Simon/Garfunkel Concert in central park.
Wife, who has never cared about fidelity sat down, and remarked, it's like a front row seat. For 240 dollars, excellent upgrade and highly recommended.