large null in theater room...help - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 49 Old 02-10-16, 06:04 AM Thread Starter
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Both of mine are in the front corners. One is angle toward the mlp the other is straight. This is what I found yeilds the best result and gives best imaging with front and rears.

I don't have rew setup yet, but have played with sub distance on my pre/pro. I read that phase can be adjusted that way. Something like 12 ft is 90 degree. Again it all by ear and SPL meter.

The suns sound a lot better now. But I plan on builds some corner trap this weekend. Lowes has some mineral wool insulation I'm going to try. Not sure if I should just order a kit from gik tho. I have read that the custom made corner kit don't do a lot in every room.
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post #12 of 49 Old 02-10-16, 06:07 AM Thread Starter
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I have to place them I'm the corner until the projector and screen get put in later this year. This will bey first attempt at prof room treatment
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post #13 of 49 Old 02-10-16, 09:21 AM
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Re: large null in theater room...help

If the null is in an area that large then yes, you'll need to play with sub position. Did it change a lot side to side?

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post #14 of 49 Old 02-10-16, 11:49 AM Thread Starter
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More ft to back...about 3 ft in ft and back of me. I have moved them everywhere along the walls. I can't put them in the middle of the room so I didn't try. I may just have to live with it
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post #15 of 49 Old 02-10-16, 12:04 PM
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Re: large null in theater room...help

It could be a non-modal null off the wall behind you. Thicker treatment in the rear would help if that's the case.

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post #16 of 49 Old 02-10-16, 12:53 PM
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Re: large null in theater room...help

Have you tried turning the all the way around (facing the wall behind them). I have seen this work very good.
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post #17 of 49 Old 02-10-16, 01:03 PM
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large null in theater room...help

Try moving the LP forward. The room length divided by 1/5 is 4.6'. 1/5ths and 1/3rds are a good place to start for avoiding nulls. Assuming I read your post correctly about being 3' off the wall. Are you using the built in test tone to measure?


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Also, I'm pretty sure move the sub distance in the avr will be a "by guess, by golly", since the lfe test tone will only activate the subs alone, and won't do anything for a null, since it's really just a delay. You could adjust and listen, but REW will definitely show you in living color. It will help with impulse response, and smoothing the crossover region, but you'll need to play a tone at the crossover frequency(i.e.: 80hz). This will activate the subs and the mains at the same time, and at that point you'll look for the most output on the spl meter. YouTube has test tones, or the App Store has some nice tone generators.(android might too).
AG - Audio Function Generator PRO by Thomas Gruber
https://appsto.re/us/pgCw1.i
This is the one I use. AirPlay, or mini to rca.

Last edited by willis7469; 02-10-16 at 01:21 PM.
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post #18 of 49 Old 02-10-16, 01:45 PM
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Re: large null in theater room...help

Pics?


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post #19 of 49 Old 02-10-16, 02:00 PM Thread Starter
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My decrease in SPL is about 3ft in front and behind my mlp. Each sub is in the front corners.
The left is about 8" off the front wall and maybe 4" off the side. It points almost directly facing the mlp. Maybe 25 degree angle.
The right is about 20" off the front wall and maybe 2" from the side. It faces parallel to the side wall.
This is the best I can get them to sound.

When you say the 1/5th thing. Is that from both ft and side wall? Cause that will be in the middle of the room. Putting the sub in front of the mains.
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post #20 of 49 Old 02-10-16, 02:01 PM Thread Starter
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I will post some pics when I get home. I am at work now
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