At night, around the same time, all of the speakers in my studio start to make noise. It's a crackling noise, like a scratchy record, mixed with a little hum. I think it might start when the security lights outside the building come on, but at this point I am certainly not sure. When my monitor speakers are plugged into my Profire 2626 outputs, they make the noise, but when I turn the Profire 2626 on or off, just for a moment the noise goes away, and I get a faint radio signal, then the noise comes back on, and the radio signal goes away. RFI? However, when I have my monitors plugged into my Focusrite Octopre mkii, instead of the Profire 2626, the noise is there until I turn the focusrite on, and then it goes away completely. My brother's SWR Bass rig is plugged into a Monster Power Center, but it doesn't seem to help. Does anybody know what I should do to deal with this issue? It seems to affect all my power outlets. I don't know much about power filtering or conditioning, and since my brother's monster power center doesn't help, and my focusrite preamp does, I have no idea what's going on. Is this a ground loop? RFI? I don't really understand those... is this something that a UPS could fix? Do I need an electrician to figure it out? What do I do next?