I checked it and I found the Legacy Cali IR from those GuitarHack's IR's. It's this one: EDGE -1 I Inch ala Sneap picI'll check them out when I get home tonight.
So like I said, that's shot with a tube power amp without removing the power amp color meaning that you get a huge low end boost and a middle scoop and a lot of presence. Essentially if you look at the speaker page on a Mesa amp sim like the IIC++ f.ex.
This part of your signal chain will be in there twice essentially. So you get a lot more of that 110hz low end which you may not hear properly on all sound systems and then you get a huge middle scoop and a lot of presence boost as well. I'm not telling you that you sound wrong or bad, on the contrary this might be able to make some bad amps sound better. But if we're talking about realism I highly advice people never to use IR's that have power color in them.