Ezaudio - You may already know about all of this, but there are various folks out there who modify the DQ 10's, and my understanding is that work on their cross-overs has quite significant effects. I bought a pair not long ago that I'm having modified/upgraded, and one of the things my guy said was, unplug the piezo tweeters. I don't know the details, but will learn more when I get them. (Like you, I'm playing around with a 2nd system, and decided to more-or-less rebuild my 80's system, which was all CJ and DQ 10's. But I'm upgrading everything. Crazy hobby.)
Good listening.
Good listening.