I used to own NHT 2.9s and now have 3.3s. I've tried a variety of amps: denon poa8200, Parasound 1500A, HK signature 2.1, Carver 705, Citation 5.1. For 2.9s, I would recommend a Citation 5.1 bridged to 300x2 or 7.1 bridged to 450x2. These speakers need ALOT of sweet power to maximize their potential. Also consider the big Rotel 380x2, Parasound 350x2, and bryston 4b 250x2.