This somewhat depends on the size of the room and the level to which you typically listen. Before I traded up to a Krell 400cx, the Bryston 7BST monoblocks I was using could be taken to the limit with this speaker, but they did not double down into 4 Ohms as the Pass will. Be aware that the Thiels drop to a min 2.54 ohms at 8kHz and the Krell handles this just fine. Don't know how the Pass will react at that impedance, and it may not be too critical if you don't need to drive to crazy high levels. Thiel does recommend Pass amps though as complementary.