I'm a long time lurker to head-fi but first time poster and would be terribly happy if I could have some suggestions for my problem.
I recently bought a Harmony Design Ear 90 headphone amp to drive my HD650 and Grado SR60e. For a while I have been using only the Dragonfly from my tower computer, Macbook pro and Iphone.
Having set up my amp on my computer desk and connecting it to the Dragonfly from PC (Gigabyte motherboard) I noticed quite irritating and highly noticeably noise coming and going with short intervals at all levels. This is not noticeable when using only the Dragonfly (from the same usb bus) powering any of the headphones. Nor is it noticeable when I connect my Macbook (with or without charger from the same wall socket) -> DF -> Harmony Design Ear 90, or using the iphone as a source. I live in an old building with old and bad electrics and that it seems like my macbook doesn't have this problem and is better shielded, but I would like to continue using my PC for my listening. There might have been some improvement (it is still there though) when I tried using a cheap externally powered usb bus to power the Dragonfly.
Do you have any suggestions what I could try out? Trying out Audioquest jitterbug or anything similar?
I recently bought a Harmony Design Ear 90 headphone amp to drive my HD650 and Grado SR60e. For a while I have been using only the Dragonfly from my tower computer, Macbook pro and Iphone.
Having set up my amp on my computer desk and connecting it to the Dragonfly from PC (Gigabyte motherboard) I noticed quite irritating and highly noticeably noise coming and going with short intervals at all levels. This is not noticeable when using only the Dragonfly (from the same usb bus) powering any of the headphones. Nor is it noticeable when I connect my Macbook (with or without charger from the same wall socket) -> DF -> Harmony Design Ear 90, or using the iphone as a source. I live in an old building with old and bad electrics and that it seems like my macbook doesn't have this problem and is better shielded, but I would like to continue using my PC for my listening. There might have been some improvement (it is still there though) when I tried using a cheap externally powered usb bus to power the Dragonfly.
Do you have any suggestions what I could try out? Trying out Audioquest jitterbug or anything similar?