@bigwave1 -- To be perfectly candid, I am not much of a measurements guy, unless something sounds way off. I do like efficient speakers because they provide more flexibility in choosing a wide range of amps.
I have been happy with all three sets of Tekton speakers I have had. Further, I think all three sound good-to-excellent at lower volumes. A comparison is complicated, if not impossible, because I am driving my Encores with a different amp than I had when I owned the Double Impacts, and I think that is an important factor.
Having said that, the Encores driven by my Lyngdorf TDAI-3400 sound better at lower volumes than any system I have ever had in my room, and that is one of the reasons I am so pleased with this system. The sound is excellent across the range, from low to high volume, never giving up anything at low volume or becoming too strident at high volume. I've been very pleased. I know that's not exactly the answer you are looking for, but I hope it may be helpful in some way.
I have been happy with all three sets of Tekton speakers I have had. Further, I think all three sound good-to-excellent at lower volumes. A comparison is complicated, if not impossible, because I am driving my Encores with a different amp than I had when I owned the Double Impacts, and I think that is an important factor.
Having said that, the Encores driven by my Lyngdorf TDAI-3400 sound better at lower volumes than any system I have ever had in my room, and that is one of the reasons I am so pleased with this system. The sound is excellent across the range, from low to high volume, never giving up anything at low volume or becoming too strident at high volume. I've been very pleased. I know that's not exactly the answer you are looking for, but I hope it may be helpful in some way.