i’m getting caught up on this thread, been on a trip in the last week plus
i am solidly with those saying this is not an amp/power issue - the dna will play plenty loud without strain, drive the alon 4's just fine thank you, even for loud listening in a reasonable room
problem is elsewhere in the system, first place to look is preamp to amp input/output matching, second place is check the tubes in the herron, third would be to make sure the source output voltage isn’t too low