Cardboard-boxy

On the nose there is some maturity but the wine lacks a bit of grace and charm. There is something dry, pinched and cardboard-boxy about it.

Source: wiktionary

[…] here where I must cope with a world only as cruel / as the people, themselves cruelly exploited / in this cardboard-boxy housing many would give / an eye-tooth for […]

Source: wiktionary

Is there anything I can do to get my 319 to sound better? I remember reading about someone placing felt type material inside the mic but is there anything else I can do? It does seem to have this cardboard-boxy kinda sound to it.

Source: wiktionary