Hi Smokey; The THX thing can be a yes and no issue. The only "truer" comparison that I was ever able to make was with the non-THX and THX edition of Terminator 2 on laserdisc. The video was improved on the THX disc on the color quality, in particular green grass which looked like green grass on the THX version but had a bluish cast on the non-THX version. The digital audio on the THX version had a fuller sound but it also sounded too midrangy. The THX disc I had also had some kind of vertical line running through it, like a kind of groundswell you would see on a calm ocean. I was able to rent two THX versions of THE ABYSS on laserdisc. One was the widescreen and one the pan and scan. The digital audio was better on the pan and scan disc. The THX mastered JURASSIC PARK on laserdisc had excellent picture and digital sound quality on the long play or CLV laserdisc but was even better on the CAV 30 minute per side disc version. Listening to the sound between the two reminded me of the compression one hears on Dolby Digital vs DTS surround tracks on dvd.