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-   -   large null in theater room...help (https://www.hometheatershack.com/forums/home-audio-acoustics/142714-large-null-theater-room-help.html)

bcarver0267 02-09-16 09:12 AM

large null in theater room...help
 

So, I have a large null in my theater room. I spent all weekend doing the sub crawl with an SPL meter and got both my sub's in the bester location. What else can I do? I ordered a umik1 and it is on the way. I have no room room treatment as of yet. I will post measurement when it arrives...is there anything I can do in the meantime?

bpape 02-09-16 09:33 AM

Re: large null in theater room...help
 

Have you moved the mic front to back or left to right to see if you can determine where the null is coming from?

bcarver0267 02-09-16 10:03 AM

The mic has not arrived yet. I have only used an SPL meter.

Do you mean, move the mic around or change its orientation?

bpape 02-09-16 12:05 PM

Re: large null in theater room...help
 

Understood. Just walk with the meter front to back and side to side and see where the null changes. Try to keep it at seated head level.

bcarver0267 02-09-16 07:38 PM

Ok...i walked the slp meter around the room to diff spots. I am down around 7 to 10 db in about a 6ft oval around the mlp. There are a couple of other spots but nobody sit in them. My room is 23d 15w 8 ft ceiling. Mlp is about 15 ft off the front wall on the long side. I don't know what to do next?

ellisr63 02-09-16 07:57 PM

Re: large null in theater room...help
 

How many subs do you have? I am thinking that if you were to have 2 or 4 subs (whatever you can handle) in the room you could change the null. I have 2 subs (centered on the front wall and rear wall), and have thought about getting 2 more subs to center on the side walls to get more bass to the front row. I know that having multiple subs will even out the bass, just not sure if it will solve your problem. Bryan will know if it is possible or might have another suggestion.

bcarver0267 02-09-16 08:30 PM

I have 2 18s...they are in the ft corners. I have moved them to every poss placement option available. They are in the best place for output at the mlp. I plan on getting 2 more in the future. I just wasn't sure if there was anything I needed to do or add to help. I have no room treatment or eq-ing of any kind until my new marantz arrives. I am changing almost my entire system and wanted to "do it right" this time.

ellisr63 02-09-16 09:12 PM

Re: large null in theater room...help
 

Quote:

bcarver0267 wrote: (Post 1387474)
I have 2 18s...they are in the ft corners. I have moved them to every poss placement option available. They are in the best place for output at the mlp. I plan on getting 2 more in the future. I just wasn't sure if there was anything I needed to do or add to help. I have no room treatment or eq-ing of any kind until my new marantz arrives. I am changing almost my entire system and wanted to "do it right" this time.

Gotcha. :)
Check out the download graphs here... http://www.harman.com/innovation


Are your subs facing the MLP or aimed toward the center?

You are def on the right track trying to get the sound as good as possible before running Audyssey, as it will have an easier time getting it perfect for you.

bcarver0267 02-09-16 09:17 PM

I'm gonna read it right now...thanks

ellisr63 02-09-16 09:31 PM

Re: large null in theater room...help
 

1 Attachment(s)
Quote:

bcarver0267 wrote: (Post 1387498)
I'm gonna read it right now...thanks

Here is the image of the sub placements... I used (a), but I will go to (c) if I get 2 more subs.


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