So before you go spending thousands on new speakers...why not try a tube processor/buffer to warm it up a bit. I use a Grant Fidelity B-283 MKII, with super-cryoed Electro Harmonix 6SN7GP from cryoset. My Mirage OMD-28s sound warm and beautiful through my SS Marantz. Spend a couple hundred bucks and see if it solves your issue.
http://www.cryoset.com/catalog/product_info.php?cPath=81&products_id=339&osCsid=3af8c3a448acd4be0486df4d4c92b5dd
Hope that helps,
Mot
http://www.cryoset.com/catalog/product_info.php?cPath=81&products_id=339&osCsid=3af8c3a448acd4be0486df4d4c92b5dd
Hope that helps,
Mot