I have a pair of Eton Symphony 7s that are actively crossed over but my center channel is a ScanSpeak Rediscovery (Madisound) and I want them to match. So I'm having new baffles cut and getting some 18W4531's. I will be using them for the midwoofers of my R/Ls and the Eton ceramic/magnesium tweeter for the highs. They will be actively crossed over at 1700Hz with a 24db/octave (do not take into account the roll-off of the drivers) crossover (which might change after measurement) using my miniDSPs. My center measures best with this crossover configuration. I've never run across this combination so it is an adventure! I really do love the sound of both the Eton tweeters and the ScanSpeaks.