I think worfzara has said it all.
The THX certification DOES actually mean an electronic component has passed a set of tests or requirements, but ultimately does not necessarily equate to a better sounding unit over those which do not have it.
There are many better built electronics that do not bother with THX certification but with it, you can be guaranteed that the item will be able to jump certain hurdles (e.g. powering 4 ohm speakers at 1khz with both channels powered, etc.).
So what? Just buy good brand names with the features you want for a price you can handle and you are golden.
