I get a tiny tiny bit of hiss through my F1-> 15/6, but it's not audible over background noise (people walking around and talking, setting up drums, etc) unless you get ear up to the cabinet.
All horns hiss some if you have hiss in your signal chain, but that is just a fact of life. The Markbass amps are noisier than some, absolutely, and the Sansamp stuff is noisier than hell in my opinion (played an RBI quite a bit).
The big thing to note about this cab is that I've compared recordings of my DI to board and a mic on the cab and it's basically indistinguishable. I would not bother using it in the studio. It's so uncolored that it adds next to nothing.
All horns hiss some if you have hiss in your signal chain, but that is just a fact of life. The Markbass amps are noisier than some, absolutely, and the Sansamp stuff is noisier than hell in my opinion (played an RBI quite a bit).
The big thing to note about this cab is that I've compared recordings of my DI to board and a mic on the cab and it's basically indistinguishable. I would not bother using it in the studio. It's so uncolored that it adds next to nothing.

I've heard literally EVERY piece of gear made decribed as 'sounding just like going into a mixing board'