@thoft, O.K., an older DR 25 with an updated newer faceplate. I thought you bought 2 and were running them as monos. With the 3.6’s 2.3 Ohm minimum impedance you’re better off with one stereo amp that is not bridged. You should have plenty of available power with one stereo unit, especially in a smaller room. Classe’ is a nice match for Thiel’s. Congratulations, enjoy.