- Thread Starter
- #21
I played around with the setup a bit more yesterday and here are some findings -
1. Turns out having symmetrical placement of furniture is quite important. I corrected a significant non-uniformity in the upper frequencies by moving a couch by 6". This non-uniformity only shows up when measuring with both L+R speakers so I guess its due to phase interactions.
::: FIG 1 ::: L+R Response with symmetry improvements
2. I tried to improve the 50-100hz dip by moving the speaker around the entire available space but it does not budge. This leads me to believe now that adding a single subwoofer will not solve the problem. Maybe 2 or 4 might do it but thats beyond my budget at the moment so I'm going to suck it up and live with the dip for now.
3. Having a slight downward slope in bass response makes a huge difference for bass heavy tracks. The following was an experiment I did measuring the first 30 seconds of "Get Lucky" - Daft Punk. Moving the balance of energy from mid-bass to lower end made it so much better (granted this one is a bit over corrected but it was quite a revelation).
::: FIG 2 ::: Mid bass correction
4. So this is where I'm at after all the tweaks. I suspect the dip between 7-15 khz can be improved by adjusting position of rugs which are a bit non-symmetrical currently.
::: Fig 3 ::: Response after correction (L / R / L+R)
::: Fig 4 ::: Spectrogram after correction (this was a lot worse before I fixed the layout asymmetry)
::: Fig 5 ::: Waterfall after correction (I installed a DIY diffuser to improve RT60 in the mid bass from 0.7s down to about 0.5ms)
::: Fig 6 ::: Predicted response + target (L)
::: Fig 7 ::: Predicted response + target (R)
1. Turns out having symmetrical placement of furniture is quite important. I corrected a significant non-uniformity in the upper frequencies by moving a couch by 6". This non-uniformity only shows up when measuring with both L+R speakers so I guess its due to phase interactions.
::: FIG 1 ::: L+R Response with symmetry improvements
2. I tried to improve the 50-100hz dip by moving the speaker around the entire available space but it does not budge. This leads me to believe now that adding a single subwoofer will not solve the problem. Maybe 2 or 4 might do it but thats beyond my budget at the moment so I'm going to suck it up and live with the dip for now.
3. Having a slight downward slope in bass response makes a huge difference for bass heavy tracks. The following was an experiment I did measuring the first 30 seconds of "Get Lucky" - Daft Punk. Moving the balance of energy from mid-bass to lower end made it so much better (granted this one is a bit over corrected but it was quite a revelation).
::: FIG 2 ::: Mid bass correction
4. So this is where I'm at after all the tweaks. I suspect the dip between 7-15 khz can be improved by adjusting position of rugs which are a bit non-symmetrical currently.
::: Fig 3 ::: Response after correction (L / R / L+R)
::: Fig 4 ::: Spectrogram after correction (this was a lot worse before I fixed the layout asymmetry)
::: Fig 5 ::: Waterfall after correction (I installed a DIY diffuser to improve RT60 in the mid bass from 0.7s down to about 0.5ms)
::: Fig 6 ::: Predicted response + target (L)
::: Fig 7 ::: Predicted response + target (R)