Upper midrange glare prominence --

I am not sure this is a cabling issue. I have an Arcam Alpha 8R integrated which is warm, Paradigm Studio Reference 20 v.2 monitors and a Denon DCM370 (Burr-Brown). I have been spending a lot of time auditioning cables to counter the metal tweeters in the Paradigms--both speaker cable and interconnects. I have become aware of another problem--no matter what cables I listen to--it seems like voice and guitar are whacking me on the head as I listen. Too prominent. What are counter-measures for upper midrange problems like this?