I'm writing a new song with classical guitar and vocals. I have the choice to sing the melody in a higher octave or a lower octave (the notes are the same) and there are some tradeoffs: I can sing easier in my lower range, but the melody seems to interact in a cleaner fashion with the guitar accompaniment if I sing an octave higher.
My question is: If I prefer to sing in a lower octave, must I modify the guitar arrangement to more closely match the vocal melody? Or can I accomplish a clean enough mix using EQ (scooping out the guitar lows), etc?
Obviously, dissonance is more apparently in lower octaves, but I can't quite tell how much of this issue is related to the mix or the chord choices themselves.
In looking for other low range singers, I've noticed that many of them only hit low notes that perfectly resolve with the root note of the accompanying chord, and sometimes the music even cuts out so the bass singer can move around the scale more. e.g.