Remember that THX doesn't certify "sound" they just make sure it has a particular off-axis response and that it has a frequency response in a particular pass band that is +/- a particular amount (can you tell I've been well-trained not to divulge specifics?)
They verify other things as well, but you get the idea. These speakers may sound great, and they may not. The real question is do they sound good
for the price? We'll have to be optomistic and see.