RTi70 grill mod:
Okay, so this is a ghetto mod, but it sounds to me like it makes a little differance. Besides, it is easy to remove, and isn't visible (unless you remove the grill).
While listening to music, I removed the grill from one of my RTi70s, and noticed that the tweeter sounded clearer. So I looked at the grill, and noticed this plastic lip in arch going around the tweeter area. Thinking that this may be causing some undesirable reflections. I went into my junk drawer, found some 1/8" x 3/4" foam weather stripping, and lined the lip on the grill with it (see attached picture). I then carefully slipped the grill down and onto the speaker (to not squish the weather stripping), and pushed it in to seat it.