Somemore, LCD are always demo under a very bright-lit room, mostly playing cartoons so that its pictures really stand out. Some shops even play the almost with "Still" pictures like a model smiles here & there or a scenery view where there isnt much motion. Then, plasma will show-off the darker scene movies or a circus show at nite or even sports view. We cant blame them, who wants to expose their weaknesses to the public. A layman's eyes will not take these into consideration. Thats why most LCD won the ppl's heart when cartoons or still scenery are being displayed from BD player. The wow factor.....but later kind of little regrets under living hall condition and still watching assssstro channels........
So, comes to video & audio audition, I personally feel that we or most non audiophiles ppl will be able to tell the difference in PQ. This is because video signal is something that we can see by our own eyes than using our ears. Audios are more of technical to laymans' ears. We sure can easily differentiate colours, blacks or resolution than soundstaging level, sound imaging, timely bass or netural mid-range, arent we?
Even I changed my HDtv from cap ayam to Monster cable, my wife immediately asked me what I have done to the tv settings... I have done nothing in fact. This is she 'sees' the difference. YOu tell her what midrange or sound-staging, one answer I'm crazy, just pure music from speakers.....

I better throw my hifi kits into recycle bin.