I am confused by the following and not sure what it means.

"The voltage output of the balanced line is limited to 1.8V
Tube implementation is not as effective as someone would expect"

Nice review. I have found few limitations with using the amp. It is nice to use it with IEMs or headphones with enough power for the headphones.

Thank you.

- Most balanced outputs are rated at 4V so theoretically there is possibility for some amplifiers or powered monitors not have optimal electronic matching.

- A Nutube can sound more "tubey" than in the AMP14.
AMP13 and Cayin C9 springs to mind.