How many times over and over and over again in this thread and in the HE-6 thread does this conversation repeat itself. I think the conclusion is understood. The M9 and maybe the EF-6 and maybe the GSX MK2 have plenty of power to drive the HE-6 to 90-95% of their potential. That plus their flexibility with other headphones is their selling card. To get 100% from the HE-6 look to a proper speaker amp..
I hope we are all settled on this and don't need to repeat it 100000 times over. CASE CLOSED!!!!
I hope we are all settled on this and don't need to repeat it 100000 times over. CASE CLOSED!!!!