Need some help with low frequencies and atmos

[Poulk]

I'd just like to see what dead zero (default) looks like in your case

Me to

 

[Poulk]

Hi all!
Now I don't have time to make any moves with HT, but I have one thought which bothers me. Do I need to use diffusers in the home theater setup? I understand for what they are used in studio or stereo listening. But in HT is much more common sense is use only absorbers.
You have much more sound sources and dispersed reflections be worse for cinema sound. With demping it's much easier to localize sound from channels. And 7-11 speakers produce enough sound energy so the room won't be deaf.
Or I wrong? If yes so which be best for HT and where it better to be placed?
I ask because of all the info I see on the internet, about diffusion are written for studio and audiophiles.

 

[Poulk]

t3t4
Sorry, now I have no time to do normal measurements (and dogs are back home from parents, they are not helping with precise action ) But I still read and make some plans about the listening room.
Of course, I will do any further action only after proper room testing.
This question more theoretical, it appeared after a small talk with my friend.

 

[Mark Seaton]

Hmmm... not really so... as we have proven over and over that the direction can yield a different response... as already eluded to with what Mark Seaton did with one of my subs. Just a few months ago I was placing two subs and firing it to the side had a better response than firing it any of the other 3 directions. I got a different response with down firing a sub vs. firing it the other 4 directions back when I had my down-firing SVS subs years ago. I would say try it and see what you get.

This is pretty much what I have always recommended, but again, nothing replaces experimenting with different placements.

Hi Sonnie,

Sorry to bring up an older post, but I wanted to quickly clarify this confusion. The confusion here comes from what is being moved vs "aimed." If you had a sub that was a small 6" cube, you could set it on a turntable and watch it spin with no perceptible difference in sound, and that has nothing to do with the size of the woofer, but rather the relative change in woofer location. If you now spin around a 36" deep subwoofer and have the same footprint on the floor, you just moved your subwoofer location by 3' which can be significant in both measurement and listening. If you think of coarse/useful adjustments as more than about 2', and fine adjustment closer to 1' for the subwoofer range, it starts making more sense as to what is worth trying.

In the case of your room, my recollection from those years ago was that we started with the large DIY subs at the front of the stage, and spun them around to be very close to the front wall/corner. I believe the total movement of the woofer location (not the center of the box, but actual acoustic source) was somewhere between 3-6' total. I believe I spun them around to push the dip up and out of the subwoofer range, where just sliding back likely would have left the dip an octave or so higher, and wanted to see the most significant result to test the theory.

 

[Sonnie Parker]

Yeah... it wasn't much we moved it.... turned it from firing forward and fired it into the corner... it was at least 2ft if not more.

I just recently had one of my DIY 18's in the back of the room... and I was able to get a better response just by rotating it 90 degrees, instead of firing into the room, it fired to the side... and the only movement was turning it sideways... the floor space stayed the same. The enclosure is about 18" deep, so it moved, but not by much. I also flipped my older SVS subs from firing down to firing forward and it made a difference in the response, as mentioned above.

My point was that direction can make a difference... maybe not with a 6" cubed sub, but with these larger subs it is possible because the driver will be in a different location. Consider mine that you moved.. no way to get that driver withing 6" of the wall without aiming it towards the wall. So aiming can include moving the driver.