I honestly think a lot of that had to do with how the guitars were tuned. Soundgarden have/had a bunch of really cool drop-tunings and some of them literally change the entire character of the guitar. The live room at Bad Animals helped, too- very smooth response and ok (not overwhelming) pre delays.
I think Kim and Chris both played on that song- pretty sure Chris was using one of his Gretsch guitars (silver jet or black single cutaway) into a 50w Marshall/Mesa Dual Rectifier to Marshall cabs (one may have been Mesa). An SM57 and an RCA BK5 was on each cabinet and each mic went to a Neve 1058.
Yep. The alternative tunings are a big part of the SG sound. They also sound more "vintage" and "alive" than a lot of modern metal bands who use active pickups in their guitars and kill what I like in guitars sound, Soundgarden has the right amount of vintage and modern in their sound.
Thank you for being part of my all time favorite "rock" record. It has the sweetest and darkest sound I've ever heard.