I've followed this topic a bit on forums, and one comment which recurs is that the difference a regenerator will make would depend very much on how noisy your line is to begin with. Good thread here: https://www.audiocircle.com/index.php?PHPSESSID=3i08psss154bnutfrdqb5n7p42&topic=173627.msg18338...
Free to try with ps audio
Free to try with ps audio