It isn't just power supply but how the power is used. You can run off of the battery, a fairly pure DC source and get excellent home sound. It is all about implementation. The Woo 6 is a home amp but I showed and have proved how implementing a good change in the power supply totally changed the amp. It can be done with a battery supply in the OEM being discussed. A wall wart isn't really a good source of power, imo.
That makes sense. I was always under the impression that a battery, that needs to be concerned about charge and life, is not as consistent as plug in options.
But I do not want to derail the thread. I know so little about design impacts.