I previously had an Acer Iconia Tab, and the sound quality was really fantastic with Dolby Mobile turned on. How does the Samsung Tab sound with headphones? It it comparable for anyone that has tried both tablets?
If you're familiar with the Galaxy S phones, then you know of supercurio's work on Project Voodoo. He has created a custom kernel with voodoo sound implemented in it. If you're not familiar with him or his work, check out Project Voodoo.