Sorry about so late a response, so this post may not matter anymore.
I'm currently looking at the Jungson as well. I owned the YA2012 years ago and it had a wonderful balance, coherence and finesses for top to bottom. I had no trouble driving 4 ohm speakers though YBA does not give a 4 ohm rating. I think the Jungson may have more drive and dynamics at the lose of some refinement.
I'm currently looking at the Jungson as well. I owned the YA2012 years ago and it had a wonderful balance, coherence and finesses for top to bottom. I had no trouble driving 4 ohm speakers though YBA does not give a 4 ohm rating. I think the Jungson may have more drive and dynamics at the lose of some refinement.