We should wait for Tyll Hertsens to publish his measurements for the HA-1, but if he comes up with figures that are close to OPPO's published specs for the HA-1, then, comparing only the power output, the Soloist is competitive with the HA-1 when using low-impedance headphones (with 1.79 Watts rms into 50-Ohm from the Soloist vs. 1.96 Watts into 50-Ohm from the HA-1), but not so competitive when using high-impedance headphones (something much less than 0.62 Watts rms into 300-Ohm with the Soloist vs. 1.43 Watts rms into 300-Ohm from the HA-1).
Many thanks Mike. I appreciate that. However there is one major difference here. The HA-1 achieves 1.79 Watts RMS into 50Ohms when using a balanced XLR connection. It will be more like 450mW with a single ended connection. The Burson achieves 1.96 Watts with a single ended connection. As I move my LCD-3 between my Hi-Fi rig and my Yamaha digital piano, I think I will have to buy myself a 4 pin XLR to stereo 1/4 inch jack adapter so that I can leave the balanced cable on the headphones.....If Audeze are to be believed and 1 watt is a minimum, then the HA-1 will not provide enough output power with a single ended connection.