All Grado's are mm. The ones you are interested in come in both 5mv or .5mv. I would not take a chance on the .5 mv ones,they might not have enough voltage to drive your preamp. I have the vpi model which has 1.5 mv output. I think you should go for the Platnum 5mv. By the way I am a long time Grado fan just love their sound. Check out the Grado site for more information or give them a call they are very helpful.
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