Preamps


I'm not unhappy with the Jeff Rowland Corus preamp,  but I don't know what I don't know. I'm currently looking for a solid state preamp with HT bypass to compare to my Jeff Rowland Corus preamp. I would like suggestions below $15K new list price to listen to. I have a Jeff Rowland 625 S2 amplifier, Antipodes DS GT music server and Chord Dave DAC. 
ricred1
ARC has a fact sheet on their website expressing concern about the tube preamps driving a main amp plus sub. it’s in black and white unless they pulled it. it killed a ref 6 deal for me.,
just looked at arc site. article called the thorny issue of impedance. it’s located in a ‘tips’ section.

georgehifi, ricred1,4425,

It was very hard to find on the AR website but this is the link. Odd though that the AR rep didn’t know this...
This also kills my plans for using a tube preamp.
http://www.audioresearch.com/ContentsFiles/The%20Thorny%20Math%20of%20Impedance(0).pdf