Well, I'm also not a native English speaker, but this one is a no-brainer:
- Two forces fight for "Balance" (noun)
- Once the conflict is resolved, you end up with a "Balanced" scenario (adjective). Not a "Balance" solution.
- The connector uses two signals that try to "Balance" the audio signals (noun), and you end up with a "Balanced" connector (adjective describing the connector).
But grammar and spelling aside, can you Jason please comment on the decision to go for 3.5mm instead of 1/4"? It strikes me (and apparently others) as a weird decision.