Yes, I know there's an actual forum for Korean, but I don't think asking such a basic question (pronunciation is obviously the most basic thing you have to learn in a language...) would be appropriate for a forum more focused on grammar. And besides, this is more about phonology than 'learning' the language.
I've read various contradictory claims on what the tense consonants actually are. I've read that they're faucalized, stiff, and just follow an odd sort of voicing rule. To me, they sound kind of like the germinated consonants of Japanese, but not quite.
What are they actually? I want a linguistic answer to this.