Krelles system with SMT room treatment!

[Krelle]

Hello again Spriritofmusic. I forgot my treated ceiling is about 4.5m x 3 m.

 

[spiritofmusic]

Hi Krelle, surely that area of ceiling treatment is way bigger than reflection points zones.

 

[Ron Resnick]

Hello Ron! In my old room (5x5 m) It was quite easy because I had big problems with 80,60 and 31.5 Hz due to the room measurements. Now in the new room (8x4.6 m) its less power in my problem areas but more Of them. IF you know the problem areas its no problem to adjust them. I use 8 varitunes4 and 3 varitunes6. I use pink noise to notice the problemareas, and then I adjust just the offending frequency.

Thank you very much!

Do you know by approximately how many decibels the adjustment can reduce a frequency peak?

 

[microstrip]

Thank you very much!

Do you know by approximately how many decibels the adjustment can reduce a frequency peak?

In my room the frequency response only changed a couple of dBs at bass peaks at best when I introduced the tuned bass traps. The big difference was the decay - it went from more than 1.5s to around .5s.

 

[Krelle]

Hi Krelle, surely that area of ceiling treatment is way bigger than reflection points zones.

Yes its way bigger. It streches from listeningposition to s little bit behind the speakers. Sideways its 3 m and the distance between the speakers are about 3.3 m. The more the better

 

[Krelle]

Thank you Ron! Heres a (fast) clip on youtube where they Tune a varitune:

They call it the ”Robin Hood effect”
The thing is to put the varitunes where the pressure is in the room. In my old room I had alot in the 31.5 Hz region in the right corner back in the room. I had one V-6 standing and that one alone almost fixed my problem of 10 DB in that region. I had two more at the back (floor/backwall) that helped but not as much as in the corner/Krelle

 

[sbo6]

I did a DIY version of SMT Varitunes and it was somewhat effective in my setup. Also, in the video you're measuring and "tuning" the Varitunes right in front of it, what counts is at the listening seat as there are many interactions that culminate into what you hear once you sit. So what you measure in the video is not what you'll necessarily hear at the sweet spot.

 

[flyer]

I did a DIY version of SMT Varitunes and it was somewhat effective in my setup. Also, in the video you're measuring and "tuning" the Varitunes right in front of it, what counts is at the listening seat as there are many interactions that culminate into what you hear once you sit. So what you measure in the video is not what you'll necessarily hear at the sweet spot.

It is perfectly possible to replicate an SMT helmholtz resonator. Only, when getting it right and with a proper outer finish you might end up with spending as much as a new unit which are not that expensive...

Regarding the tuning: it has to be done at the varitune as that is located near the room boundaries which is where the problems are. These issues (and their harmonics) get projected into the room. So at your listening seat, you will benefit not only from the solution given to the problematic frequency but its 2nd and 3rd harmonics as well, providing you did the tuning properly, located the resonator at the right spot and have sufficient of them compared to the peak level you want to remedy.

 

[sbo6]

It is perfectly possible to replicate an SMT helmholtz resonator. Only, when getting it right and with a proper outer finish you might end up with spending as much as a new unit which are not that expensive...

Regarding the tuning: it has to be done at the varitune as that is located near the room boundaries which is where the problems are. These issues (and their harmonics) get projected into the room. So at your listening seat, you will benefit not only from the solution given to the problematic frequency but its 2nd and 3rd harmonics as well, providing you did the tuning properly, located the resonator at the right spot and have sufficient of them compared to the peak level you want to remedy.

While there is likely a direct relationship between the tuning you are doing at the Varitune there will likely be quite a bit of variability at the listening seat which, as I'm sure you know has it's own limitations and is a compromise in and of itself in terms of boundaries and its relationship to speakers. The net is - the tuning and effect at 1 Varitune is part of a much bigger puzzle.