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is their a big difference between the x-12mk500 and the x-72mk500 and if so what is it witch makes the x72 performs better I tried to look up the specs but they seem very similar and I am not too tech savy or should I go with the SC-1mk500.
Those preamps, SC-1, X-12 and X-72 are all very different from one another. It's not like one is better than the other. Personally, I can't pick a favorite. Each one has their own personality or characteristic in sound. This is due to either a) different topology and designs, b) different input and output transformers used.
The X-12 and X-72 are my "flavored preamps". They have lots of color due to the Input/Output trafos used. The SC-1 is more of the clean and clear type.
has anyone used a shure sm7b in one how do they sound? any recommendations if you haven't? I am going to be recording vocals mostly mostly rap,r&b and a bit of acoustic
Yes. A lot of people have reported to me that the X-12 paired with the SM7B is killer. There's also a vocal clip on the Audio Samples page recorded with the X12/SM7.
See also the User Reviews where users report their X-12 used with their SM7. Lots of good feedback from users.