Topic: very bad sound quality analog7/8 ff400

hey everybody .. i bought my ff400 befor 7 month , actually i didnt use the headphones output so much but i think that somthing happened .
when i plug any headphones into my 7/8 analog output im getting very bad quality sound , close to mono but not exaclay . also the mono mix is not working on this output..
anyone know somthing about this problem ?
i remember that the sound was better ..