Check out my new Home Theater ... One Problem ... Bass - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 14 Old 09-25-2017, 04:21 PM - Thread Starter
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Check out my new Home Theater ... One Problem ... Bass

Here is my Home Theater.
Once I placed those custom made panels (I made these myself using 6-8 towels per panel) side panels worked like magic. Eliminated ringing echo of a clap.

Now, my biggest problem is bass. The closer I sit in the corner the move bass I get and if you sit on the couch towards the door, bass is cut by probably 70%. Now, I have not run Audyssey EQ on my Denon receiver yet but I doubt it will help.

Any suggestions?

Thank you.
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post #2 of 14 Old 09-25-2017, 04:26 PM
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To start with, you should experiment with moving the sub around the room. That's the low hanging fruit here ;-)

You may want to read up a bit on room nulls as I suspect your seating position is in one! Bass traps on the rear wall might be required. take a few of your wall treatments and try stacking a few (so they are 4 to 6" thick) at your back wall. If you google bass traps and room nulls you'll find some interesting reading.

Also, give try the mirror method for finding first reflection points as I suspect your wall treatments are not optimized for placement.

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post #3 of 14 Old 09-25-2017, 04:38 PM
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why this is happening and solutions are discussed in this article

http://forum.blu-ray.com/showthread.php?t=48286

One quick thing to try, with only one sub put it centered in the middle of the room along the front wall and bass should be better in the middle seat on your couch.
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post #4 of 14 Old 09-25-2017, 06:11 PM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
why this is happening and solutions are discussed in this article

http://forum.blu-ray.com/showthread.php?t=48286

One quick thing to try, with only one sub put it centered in the middle of the room along the front wall and bass should be better in the middle seat on your couch.
So, I am curious, what will bass traps do in my situation? They won't move bass more evenly in the seating position or will they?
I am, very limited at where I can place my sub. I can try it on the right side of the room. Also, how will running room EQ help?

thank you

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post #5 of 14 Old 09-25-2017, 09:05 PM
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traps cut the peaks down to size they don't fill in your nulls, Nor will EQ. If you've got a dead spot you need to either move your sub, add more subs or move the seating.
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post #6 of 14 Old 09-26-2017, 12:52 AM
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If you want more even bass in all seating positions I would add more subs, and place them in the corners.

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post #7 of 14 Old 09-26-2017, 05:17 AM - Thread Starter
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Quote:
Originally Posted by LydMekk View Post
If you want more even bass in all seating positions I would add more subs, and place them in the corners.
Yea, I know. The problem is that my sub is about $1,000 and I don't want to spend that money right now on a second one. I'll try placing it in different spots.

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post #8 of 14 Old 09-26-2017, 07:11 AM
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Quote:
Originally Posted by Pianist718 View Post
I am, very limited at where I can place my sub.

thank you
If you can't add another sub, place your sub in the main listening position. Crawl around in all the possible sub locations. Whichever sounds best, that's your starting point.
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post #9 of 14 Old 09-26-2017, 07:14 AM
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Quote:
Originally Posted by Pianist718 View Post
Yea, I know. The problem is that my sub is about $1,000 and I don't want to spend that money right now on a second one. I'll try placing it in different spots.
go DIY.....will save a fortune..
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post #10 of 14 Old 09-26-2017, 07:27 AM - Thread Starter
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Originally Posted by chadsmith013 View Post
go DIY.....will save a fortune..
I know, I know, but already bought the Rythmik and I love it.
At least I wend DYI with the sound panels :-)
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post #11 of 14 Old 09-26-2017, 02:17 PM
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As mentioned, your seating location is likely right in the middle of a null where the sound waves are cancelling each other out. Equalization isn't likely to be effective. You can boost levels with EQ, but that also boosts the waves that are cancelling out the primary waves.

Why can't you move the subwoofer? I assume that it is the dark cube under the lower left corner of the screen. There are countless locations in the room where you could move it, including anywhere along either of the side walls, a different location on the front wall, or a ways away from the front wall.

This may not work out if you end up too close to the screen, but you could also try moving the couch a way from the wall a bit. Even a foot or two may help.

You may want to take a look a the following videos. Your absorbent sound treatment panels on the side walls should be in the first reflection points to be effective. They appear to be way too high up on the wall and too close the front of the room.


You'll get more localized, and better quality sound, by moving the center speaker higher up and orienting it vertically instead of horizontally.
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post #12 of 14 Old 09-26-2017, 04:50 PM
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Bass traps work by converting the bass energy to heat, removing the sound from the room. It acts on the bass waves once they have reached them, so placed on a back wall they help to reduce the back wall reflection and thus act on longitudinal axial modes primarily. In corners they actually don't act on modes in quite the same way and mostly work by converting the bass energy to heat and thus reducing the ringing. It sounds like you need both. Corners are high pressure zones for bass and corner traps will reduce the buildup of bass in the treated corners.

Velocity absorbers are too inefficient to use on rear walls effectively enough to act fully on the rear wall reflection, but pressure absorbers tend to be too narrow of bandwidth (or if made to be broader bandwidth low Q will be too inefficient themselves). This means that measurements to find your modes would be good. Then calculate your room modes to be sure they are axial and treat accordingly. I think frequency restricted corner traps are a good option to help address some of the problem. A trap on the rear wall would be good, but I would measure and think about a tuned pressure absorber that is tuned to your mode frequency. You need a lot of bass traps to be effective.

If you could eliminate all reflections of the bass frequencies you would have no need for multiple subwoofers. However that is typically not possible so you have to make the room work for you instead of against you. Bass traps will help smooth the bass and improve seat to seat consistency if placed appropriately. However nothing works better than multiple strategically placed subs.

Your subwoofers do not need to be identical. It makes things simpler, but you can use two or three lesser subs to help smooth bass. If you use an amplifier with dsp that includes limiters you can set them up so once they approach their non-linear volume level the limiter kicks in. You can then use high and low pass filters to make sure you use them where they work best. Subs aren't like mains, the room dominates the sound of bass below a certain frequency. Using a mix of subs won't degrade the bass unless the subs are being overdriven or are poorly placed.


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post #13 of 14 Old 09-27-2017, 09:03 AM
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The answer is to get your seating out of the corner and off the walls.
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post #14 of 14 Old 09-27-2017, 10:57 AM
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Besides the suggestions already given, I must say that if you make bass traps (and I think you should), please DON'T make them using towels. Fiberglass or rockwool is much more effective. The only downside is their fibers eventually escaping from the fabric cover, but you can cover the slabs with very thin cling film to make sure the fiberglass/rockwool stays inside.
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