I use them for OH and acoustic guitar. OH, spaced pair, with the low cut filter. Acoustic guitars a few feet back pointing at where the neck meets the body with the filters flat.
Thats what I figured. I was thinking about a set of nt55's, but no one had a lot to say about them. I heard the nt5 (the nt55's little brother) were alright, but thats not enough to warrant a purchase for me.