b4 stereo

[b11ndy]

hey all, as some of u know i installed new stereo. was driving to work this mornin when it cut out so stuck old one in still nothing. checked fuse its fine in fuse box num 22 think it was and one on stereo. so checked the live feeds there was once two but now there is only one is there another fuse somewhere or is there a built in amp for speakers that causing this problem.