Further listening is telling me that without subs, the room definitly sounds pretty good, there is an occasional boom in the bassfrequency, probably the peaks at 55 and 100hz, it would be great if i could get rid of those, without further lowering the overall rt60 times above 200Hz
i did different test with trapping in midlle of backwall aswell as in backcorners. (see posts above)
it did nothing to the spikes in the 55hz and 100hz range but instead created a dip in 200hz to 300hz range.
Do i need more trapping on frontwall or do you think left and right to ceiling corners can help here?
Your frequency response plots with smoothing really look pretty good.
I read through your posts quickly and could not tell if any of the absorption is thick enough to be effective as bass traps. Traps need to be 6" to 8" thick to be effective. I ended up with 5 of GIK's Monster Traps in my room plus R30 insulation above a suspended ceiling before I got the waterfall plots to look acceptable. But, as you have noted, my room does sound rather dead. But, it is 100% HT, so that works for me. Perhaps adding some dispersion panels would liven up the room for music.
I can identify with your concern about matching the subs to the sound of Klipsch. I have Klipschorns in my system and found that sealed subs, in my case Hsu ULS-15s, matched rather well. I still have the excellent transient response of the horn bass plus nice, tight LFE from the subs. I recently added Hsu MBMs to the system in sealed mode to add more "punch" to the system.
In summary, I think you have made good progress in treating your system. I agree with Bryan that the first few plots appeared to have the sub level up a little high.