The following is a review/comparison of the KLEI Copper®Harmony Phono/RCA Plug and Copper Bullet Phono/RCA Plug by John Withem (JW Audio)…
Yes, I have tested the KLEI Copper®Harmony Phono/RCA Plug against the Copper Bullet Phono/RCA Plug.
I made an IC with the new KLEI Copper®Harmony Phono/RCA Plugs and one with the older Copper Bullet Phono/RCA Plug, and the KLEI Copper®Harmony Phono/RCA Plug was a great improvement. I also took it to an audiophile friend of mine and tested in his system with the same results.
Hope I have answered your question fully and I know you test you products very well, but I have a vast amount of audiophile friends and systems from $5000 to $80,000. I would be honoured to beta test anything new you have to offer. Just a thought…
John Withem (JW Audio)