Hi guys..There was no way I wasn't going to send my Krell Duo 300 back for the upgrade.I am too OCD and I wouldn't be able to sleep not knowing how that upgrade is...LOL...So I sent mine back already last friday 12/7..I loved the sound before..I can't really imagine what it will sound like after they upgrade it. BUT I HAVE TO KNOW..LOL..I will report back to you!!.They said I should get it back before 12/25
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