It's a valid thread. I've searched and never found a true answer to Rainbow Vs Diamond. And it's still ppl saying one is better without any real feedback.
Its always a valid inquiry. But there is no true answer. The only thing the poster will get from this thread is feedback only on the people that decide to post in this thread.
Searching you'll find more than adequate accounts on some peoples thoughts on tonality, SQ , door use, power handling, midbass, kick versions, etc...
My opinion, i dont like the new Diamond speakers. Do I think the D6's are crap? No. But I prefer a more natural, tonally correct reproduction. I like space in my instruments, and an airy , non fatiguing quality to my tweeters. So when you put price in the equation, and you actually hear both of these- you feel you are getting more with the SLC's. It is a more inviting sound, with more life to it. You stop yourself while listening to transients, and you go 'now that sounds really nice'.
Having had the D6's in one of the demo cars last year, all I can say it that it makes one hell of a coax in its coax mount form. I has a nice balanced performance w/ good midbass, but nothing stands out. Nothing captures the listener. I prefer the D3 actually as a better value quite honestly. Outside of the need to mount the tweeter with the braxial mount option, theres really no lucrativity to this set.
So if just straight up getting volume and loud is the need, without the SQ properties and staging benefits of separates , i can lead you to some Pioneer 4ways 6.5's that'll get the job done...hehe