You must try them in your system and listen to what they do its really up to you and your system preferences.Any way Symposium Hdse work great in my system wonderful on CD.Hope this helps enjoy.
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I use Sort Kones on my phono preamp, preamp and amp. They do make a difference. I would describe it as cleaning up minor distortions and noise artifacts which improves the transparency of your system.
If you look at the Nordost information on Sort Kones they describe the effect and reasons for the improvement in more detail.