What happened to my room acoustics

@erik_squires @newbee @mijostyn @rhljazz @hilde45 @audiokinesis @ervikingo @jamesw767 @aewarren @ronboco 

Again, thank you all for the insights and great suggestions. I think I may have found a potential solution for issues I am having. The Anthem Room Correction (ARC) system seems promising. A gentleman had the same 12kHz dip issue in his Buchardt S400 II speakers (so I guess it's inherent to the speakers) and he was able to correct it with the ARC built into his Anthem STR preamp (>$3k). I don't plan to purchase that expensive preamp, but MartinLogan has a Unison preamp ($199) with ARC built in. I hope it will do the same trick to address my issues. Fingers crossed for it.

To add to all of this...if using stands... spikes tightened?...leveling speakers helps? fwiw.

Thanks, but that isn't the cause of the issue. As I explained, the treble dip at 12kHz is most likely inherent to the speakers, while the boosted midrange and mid-bass are likely due to reflections.

I do not use spikes under stands or speakers. Spikes are not ideal decouplers. Instead, I use Moon gels, which are drum dampers, under the speakers. In my opinion, they are far more effective decouplers than spikes, and they also help keep stand-mount or bookshelf speakers level and stabilized on the stands. Based on my A/B listening tests, the bass performance is as good as the SVS SoundPath Isolator, which costs $99 for a pair of speakers.    

Yeah ive heard of people using the moon blobs...ill trust your not on carpeted floor like i am...were i want stands coupled to floor with spikes.Thanks...glw project.

My stands are on adjustable metal screws, securely anchored without piercing through the carpet.  Moon gels decouple so well that the vibration from the bass is not felt on the stands, and the vibration from the ground is not transmitted onto the speakers.