I think having tweeters in the R33 range was a factory option.
My old series1 had factory tweeters, however, my series2 doesn't.
I was going to mount some tweeters in the factory location as I was doing a stealth install.But there is no space behind the A-pillar trim.The factory tweets are tiny thin.
I recently installed sme infinity componets in a friends R32 and mounted the tweets in the triangle behind wing mirrrors.I angled the tweets towards and sligtly up to the windscreen - ie.the tweets were pointing to the windscreen.
The result was bloody good, very good mid/high transition and a fantastic high soundstage that didn't sacrifice to much frequency seperation.
Normally I preach from the "keep tweets close to mids" gospal, but in this case I thought it sounded great.I would definatley recommend trying tweets in lots of different positions as it can make the music sound very different,so try an see what your ears like.
Hope this helps anyone else who is wondering about tweeter locations.
