The other day I had a very similar sound from my system. On occasion in the past when the sound got weird/scratchy/slooow, I've un-hooked all the power cords, rearranged the power strips etc. No help this time with this regimen. Even more surprising this time was mid-range transistor grunge which has never come from the DK VS.1 MK II amp. before. Whatever faults the DK has, at least it usually has low transistor grain (my Almarro 5 watt A205A is out for modification, thus the use of the DK for now). Asking my local guru (Deets' Sound Room} about this, suggested I try the used Adcom "power conditioner" he had (model ACEsomething, $120). What a difference! no grunge, no grain, timing correct, no more sloooow. Even the DK had bass "punch" it never had before. I had never been a big fan of power conditioners and had success with power cords only to extent of adding focus/definition to sound, not a transformation like this, I suspect a happpy combination of effects for my wiring, power company, equiptment but I hope this helps you straighten out your system without having to replace stuff your're happy with. Let us know how it all works out.....and would like to hear about others that had good success with power conditioners of any type, Mike.