Sealing doorways...does it make a difference

[Jeff5347]

Just to add before i forget i appreciate the help and advice for as much as i do know there so much more i want to learn. The open doors as a bigger enclosure i never thought of but now makes sense

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[William Lemmerhirt]

So heres some extra info. I have an 8 ft couch about 10 ft off the front wall. The front of the couch is at the 10 mark. I also have a love seat anout 6-7 feet behind the couch. The rear area is setup as a sudo reading area. On the front right is a built in bookshelf with blu rays and such.
I have to correct 1 sub. The vtf1 on the front. I said it was about 1/3 in from the left but i forgot it is in the front left corner. At least from rew graphs that is where all 3 subs and the main seem to produce the best "straight" line.
I did do a little test. I pinned 2 towels to each other then attached one set to my left and then right side at the mains reflection points. Now i did hear a difference i guess i would say less shrill. Maybe the highs werent as piercing if that makes sense. Now i will admit im a bass head and i know what i like but to say the towels on or off was better than the other im not sure.
Heres some pics of the room

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Take me to your leader.......(Gene)
Cool room. Mains are pretty close to side walls so I’m not surprised the towel test proved favorable. On side has a cubby and the other a door... I would definitely think some treatments in order. Should help with the “shrill” you mentioned and give some balance, and focus.

 

[ryanosaur]

@ryanosaur I just wanted to touch on something quick. I know your very quick to propose against corner loading, and front wall placement but it’s also very room dependent. In fairness this is something you’re also quick to mention. My point though, is corner loading and front placement also CAN be very effective. Especially on concrete with a vaulted ceiling like me. I’m pretty flat down to about 15hz. All 3 subs are corner loaded, and 2 are in the front. A couple things. While they are symmetrical in front, they are NOT symmetrical in respect to the whole space, and the left side ceiling is 9.5’ while the right side(only half the distance across the whole space) is 12.5’. Imo this makes it not symmetrical as my LP is 16’ away, but I have openings that carry well beyond that. I believe you’re on a crawl space, so basically suspended, and that can be nightmarish to deal with. Also, the narrow but very tall shape would dictate placement away from corners.I know you’ve mentioned turning your subs down after audyssey. I think that’s interesting considering most find the need to turn them up. Anyway just good for thought. Haven’t rapped with you for any. Maybe just needed some dialog lol.

For the op, the reason you get response at 14hz with the doors open is you’ve kind of enlarged the “enclosure”, or room. That allows the long waves to carry out of the room without doubling back into the room and messing with the FR. It’s kinda like the difference in a small subwoofer enclosure vs a large one.

Indeed!!! You, and Pogre... many people make it work. Believe me when I say I've paid attention! I believe in striking that balance, questing for better understanding, encouraging the learning that leads to a better experience. I guess that's the Chef part of me... I've had to enroll people in a quest to be better than they are. And that's why I like it here!
So many amazing friends here, with great stories to tell. This is a perfect illustration, too. Thank you. This counterpoint is essential and shows that there are multiple ways to do things. Not just the one way we so commonly see recited. As you point out, I'm just as quick to say that my experience isn't the only way, and that is by design. I can't buck against dogma by creating more. I can, however, push, everyone who is willing, to have a new experience; to try something different. If it helps somebody out, or gets somebody more deeply engaged, then I'll take it as a victory for all of us.
Even if they do still use the front wall or corner loading.

Cheers, Bill!!!

 

[Danzilla31]

Indeed!!! You, and Pogre... many people make it work. Believe me when I say I've paid attention! I believe in striking that balance, questing for better understanding, encouraging the learning that leads to a better experience. I guess that's the Chef part of me... I've had to enroll people in a quest to be better than they are. And that's why I like it here!
So many amazing friends here, with great stories to tell. This is a perfect illustration, too. Thank you. This counterpoint is essential and shows that there are multiple ways to do things. Not just the one way we so commonly see recited. As you point out, I'm just as quick to say that my experience isn't the only way, and that is by design. I can't buck against dogma by creating more. I can, however, push, everyone who is willing, to have a new experience; to try something different. If it helps somebody out, or gets somebody more deeply engaged, then I'll take it as a victory for all of us.
Even if they do still use the front wall or corner loading.

Cheers, Bill!!!

OR! 2 way speakers!!!

 

[Jeff5347]

So since you all have been very helpful and i know i started this on sealing doors....but i have a question since we were talking making the room better. This morning i took a sweep from 10 to 6000 hz. I wanted to drop some pics for you to analyze. From my limited knowledge on waterfalls im thinking it doesnt look good.

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[TLS Guy]

My question is in regards to all doors in our theater rooms. I have 3 doors. 1 to get downstairs, 1 to the furnace room and 1 to the washroom. At the bottom of each door i have an gap of 1/4 to 1/2 inch depending on the door. Also in all doorways i have small felt dots that "shim" the door from the frame so i dont get rattles. My ask is does having the open air gaps compromise the pressuring of the room for bass. I was think of getting seals all the way around the frame and at the threshold to essentially airtight the room. Am i overthinking this? Would sealing the doorways incease the pressurization of the room or would it be wasting money and time on no diiference at all.

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Well for a start there will be heating ducts and very possible cold air returns, which will have greater leakage.

The big point is that the pressure changes are a wave. And even in the deep notes it is oscillating plus or minus 20 times a second. So in those terms the door gap would be a high resistance leak and not change the sound.

Of more significance with gaps is extraneous sound leakage in and out. That though especially applies to HVAC.

 

[William Lemmerhirt]

FWIW there’s a “camera” button on most of the rew screens. That acts as a screen capture so you can just upload actual screen images without taking pictures. Also, that dip at 18hz looks like it’s caused by a phase switch/knob setting. Try switching one to 180°. Possible a port interaction.

 

[Jeff5347]

Ill switch one of the phases and see where that goes. Just so its noted there is no smoothing. I noticed with smoothing of 1/6 the graph looked to nice. Didnt show where the problems where. I also for one sweep i moved the mains closer together. There was no change in response until say the 150 mark but the soundstage felt very narrow. Almost uncomfortable


Oh to note. If i do a rew sweep should i disengage the surrounds and fr height channels so just LR mains and subs?
I honestly wish someone with knowledge more than mine lived closer to come to my house and give a listen and maybe some more optimal placements if needed lol

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[snakeeyes]

OR! 2 way speakers!!!

@ryanosaur is too good for 2-way speakers now. LOL

 

[ryanosaur]

@ryanosaur is too good for 2-way speakers now. LOL

Hey! I have three pair in my room... 2 now plus another I’ll be building soon.

 

[William Lemmerhirt]

Ill switch one of the phases and see where that goes. Just so its noted there is no smoothing. I noticed with smoothing of 1/6 the graph looked to nice. Didnt show where the problems where. I also for one sweep i moved the mains closer together. There was no change in response until say the 150 mark but the soundstage felt very narrow. Almost uncomfortable


Oh to note. If i do a rew sweep should i disengage the surrounds and fr height channels so just LR mains and subs?
I honestly wish someone with knowledge more than mine lived closer to come to my house and give a listen and maybe some more optimal placements if needed lol

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Yes. Sweep with only LR plus subs. You can also do individual subs and then combined to see how each effects the others. Also, some people sweep with center plus subs to avoid possible comb filtering from the mains producing the exact same signal.
Where you at? I could use a road trip maybe. In the middle of some property line issues with a crappy neighbor ATM...

 

[Jeff5347]

Ok im going to do some sweeps now and post to see if phase can help or not. Are you saying wuth the center do a sweep with mains center and sub or just center and subs. Im in central Mass next to Worcester. Where are u from

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[Jeff5347]

Well i did sweeps from 10 to 150. I have that dip at 18 or so still. Move each one at a time oop, then all oop then each one going back to 0. No change in the dip. I moved my rear sub back a little which improved it a bit but as i kept going back it started to negatively effect it again. I will say i had to go into the furnace room a few times as i keep all my cables and audio acces. in there and forgot a few times to shut the door. Right off the bat thru rew i was like ok forgot to shut it. It was a neg effect. Im honestly wondering if the 7 ft ceiling is making that dip. I know taller is better and i have to work with it but it is taking so much dbl out all the way to say 25 hz

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