I did some searching on this in the past- there are reports on the annals of TS.com about people having problems with this setup... but there are also many reports of people having no problems whatsoever.
I'd do a search in the archives and try to read some of the messages from people that reported having problems. My personal choice was to pass on the Earthworks because of the mere possibility that it would fry the pre. But, that's my choice.