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

lanx000311-03-2023 1:14pm

erik_squires Details Discussions Posts This discussion Message User 15,791 posts 11-03-2023 at 01:22pm Copy Comment URL Report Comment Edit Delete Is this even the right forum? It seems like you are replying to a thread from a different web site. You might want to clue us in on what speakers you are even talking about. Measure 1 speaker at a time. That dip you see around 12 kHz can very possibly be a reflection issue. If ithe frequency response dips change frequency as you move the microphone closer to the speaker that’s your clue. Generally speaking, if all you have for room treatments is the bass traps and single curtains you are not going to have enough. Treating the room to be more absorbent in the mid to treble regions (including the ceiling) will let the bass emerge from underneath. Another approach, of course is to move the speakers closer to the rear wall until you get the balance you are seeking, or just use tone controls. :)