I read about guy bragging of the T-amps with mid to large sized speakers, and they love the combo, I am willing to bet your just over driving the hell out of those HPs. Be careful you don't destroy them.
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J.Mimna Photography
Live Concert Recordist

Outlaw 970>
Emotiva XPA-2>
Martin Logan Preface

Some Of My Live Recordings: http://www.archive.org/bookmarks/J.Mimna

My Concert Photographs: http://www.flickr.com/photos/jimna/collections/72157613267633153/