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monitor noise.. room electrical problem?

Hi all. I just recently purchased a pair of Yamaha hs50m's which I'm using in conjunction with my Focusrite saffire firewire audio interface. To make a long story short I was getting some dreadful noise through the monitors. When I unplug the power supply from my laptop and run from battery power, the noise dissapears completely and my entire system is functional.

Kind of buzz/noise issue with my Mixer & Mic preamp PSU

Hi all!

I just bought a micpreamp -PreSonus Tubepre- & I need to connect it on the same USA-EU transformer (they are US models connected on a European plug) of the one which is used to connect a Mackie VLZ 1202.

it makes a kind of buzz/noise which is more than annoying for my voice recordings.

Any ideas to solve this?

Thanks for your answers!

"Ground lifting" to eliminate noise from Computer

I heard a hum/static through my monitors and headphones when using my Firepod... After a while, I eventually traced the problem to the power adaptor for my Laptop. When plugged in, there is a hum, and when not plugged in there isn't. This must be due to the ground... therefore, I'm trying to figure out the best way to solve this problem.