What happened to my room acoustics

I measured the spectrogram for my room at my MLP, and the FFT results are as follows:

- There is a roll-off before 20kHz.

- A dip is present around 12kHz.

- There is a noticeable boost between 50Hz and 1.5kHz.

- The bass rolls off around 33Hz at -3dB, consistent with the factory rating.

Comparing these measurements to the Burchardt measurements, there are some differences:

- It doesn’t exhibit a roll-off before 20kHz.

- The dip is around 15kHz.

- The boost between 50Hz and 1.5kHz is not as pronounced as in my room.

I’m curious about what might be happening with my room acoustics. If a fix is possible, what would it entail?

Spectrogram from my zoom


My room / speakers setup


Measurements from Burchardt


@lanx0003 No worries, those are suggestions.  They have worked well on my 4 prior rooms and speaker setups.  

The most challenging were the Aerial 8b with the side firing woofers and the Betas since you have further flexibility but I had already placed a huge projection screen which can't be blocked.

BTW, like the Poang but its a bit too upright for my back.

@ervikingo  The almost full-range Aerial 8 is reviewed favorably with impressive specs. It could be an endgame choice. Good luck with them. The Poang chair is a bit too upright for my liking as well. But if I sit further tilted back (on other chairs), I found that the sound perception changes drastically.  I am getting used to it now.

@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.