The Makua, Ayre, and W4S preamps that have been suggested should be ok in that respect. Not sure about the EAR.Thanks all for these great suggestions, it would have taken me a while to find them. I am actually aware of the suggested preamps, and I must have heard the W4S during a show demo, but did not know they had dual outputs. It was something that I never was looking into until this recent need.
Now I have some research to do while I work on my job.
@almarg Thanks for the math. Do not really understand but I will take your word for the suggestion.