hi , thanks for replay , i have not any strong reason to change this machine as i am happy with it but as i changed my speakers last week , the dealer said i will be a great deal of improvment in sound quality with my R700 speakers if i change my AV to lx86 but i dont know if he want to sell me a new AV for his balace sheet or lx86 is realy suprior in sound and new features! i already know about 3D upgrade with lx86 but to be honest that dosnt bother me alot! i have a dedicated 5.5m X 4m cinema room and just wonder if this upgrade make a noticble improvement in sound for music and movies? my cnter speaker is kefIQ60c and sorround ones are kef KTH3005 pack!