The Hannabach carbon G string is a definite improvement over conventional strings. It reduces the "tubbiness" that is usual on G strings. Intonation is satisfactory.
The Hannabach carbon top E string sounds great but seems to have a problem with intonation. The 12th fret is slightly flat, and the 14th fret is seriously flat. This seems to be because the carbon string is thinner than a regular nylon string and therefore more elastic and hence its tension does not increase as much as a regular string when it is fretted. The problem could probably be overcome with a bridge that has each string individually adjustable, but this is rare on classical guitars.
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