The way I read this is that they have come up with a simpler design (GOOD!) and up the power to 4Wpc (NICE!). I’m excited. Here is the text from Burson:
3 years after their benchmark setting HA-160 headphone amplifier, Burson Audio has introduced a new head amp/preamp 2 in 1 named the Soloist.
Staying true to their IC free design approach, the Soloist is a pure Class-A amplifier free from standard IC opamp and IC power regulator building blocks.
Comparing to the HA-160, the Soloist has 35% less components on its signal path which translate into a even more organic sound. Output power has increased to 4Wpc and can be varied to match to any headphones.
Furthermore, the Soloist is also a streamlined preamp that promises to match well with any power amps.