volume

Hi, I have a newbie doubt on how to go about matching devices. I recently had my chinese DAC die on me due to what i think might be a power fluctuation and i went back to my old Schiit modi multibit, feeding it directly into my tired old receiver being used as the 2.1 amp. Well, the setup...

Like the title says, I'm trying to replace my Schiit jotunheim with topping d50 + a new amp. When I turn it to RCA and touch the volume knob I hear noise. I believe I have one of those ******... I mean Schiit jotunheims that have an ungrounded chassis. I need to send it in. I won't have a system...