Asus mobo. win7. I had usb powered speakers for a little while.soon after,one of the speakers went out,so i decided to buy some powered speakers.All this time it's sounding alright.Now,i get brand new powered speakers,hook them up and only one speaker is audible.I've checked as much as i know on settings and it's the same.And now the sounds sound like if they're coming out of a pipe,quite a bit of echo-reverberation.I connected my usb speakers back and the same [censored] sound.What else can i check?