Alexb1096

Hi, about two years ago i bought my Amplifi TT and i'm very happy. I use it into a stereo in my bedroom (directly or through a little mixer). I always had a great sound and a great volume, but now i noticed that the volume of "amp out" is very low and the sound is tiny and distorted. If i use "phone" or "main-left" outputs the sound is great. Is it possible that the "main out" output is broken or defective? I used my Amplifi TT only 3/4 times outside my home. Thanks