AV amplifiers are built for one purpose only. Movies. They have to incorporate picture switching, conversion, scaling and processing, room EQ circuitry, multi-zone capabilities, and somtimes internet connectivity. Some of the better amplifiers are tremendous value for money, offering more facilities than most people will ever need. Obviously all this costs money, and manufacturers have to design and build AV amplifiers within certain budgetary constraints. For this reason, most AV amps don't use hi-fi grade or bespoke components, and have to rely on cheaper mass produced off the shelf ones. This will affect quality. For many, this is not an issue, as many people's sound quality expectations lower with the ongoing degeneration of sound quality within our society. For the majority, an AV amp will be of sufficient quality to replace their hi-fi/mini system, But for those that have a mid priced, 2 channel based hi-fi system, AV amps just aren't going to cut it. It's all very well trying reference CD's and the like, but a lot of these sound good on anything. Try something a little more 'normal'. Something that lacks a bit of bass and dynamics, that is compressed and lacking life or depth. These sort of discs tell a different story.