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I need help to do a diy home theater seat for max tr to buttometer.

650 Views 17 Replies 6 Participants Last post by Sekosche, Aug 28, 2019

Russell Burrows

Discussion Starter · Aug 25, 2019

My first question is what material is best to build a ht seat for max tr response?

In other words whats the best material to make the framework before adding padding and the finishing cover material?

I primarily see thin plywood frameworks but does thinner plywood work better?
What about thin baltic birch or pine or cedar, mezquite, oak,etc?

Or what about trying a metal framework with thin sheetmetal as metal buzzes a lot?

As always two things
The first is i have no idea what i am doing and the second is
Help!

Thanks.

1 - 18 of 18 Posts

Russell Burrows

Discussion Starter · #2 · Aug 25, 2019

Hmmm nobody posted? Oh well the good news is i have a glimmer of an idea but the bad news is i get paid till the sixth september so i have to wait to try my increased area coupling couch framework idea.

But off to some hardwares and lumberyards to do reasearch i go.

Sekosche

· #3 · Aug 26, 2019 (Edited)

I can’t help much with your DIY seat build, but what are your primary devices going to be for adding TR? Specifically, are you planning to use nearfield subwoofers, bass shakers, a BOSS platform, motion actuators, subwoofer’s built into a riser, etc.?

Depending on the devices used for TR, rigidity actually goes a long way to help evenly transfer that energy across the seating. All chairs are not built equally, and judging by the posts I’ve read when people switch furniture, the seating does tend to have a substantial impact on the TR. Whether it’s a wood or metal frame that has the upper hand, I can’t answer that, as I’ve only had metal frames to this point in my theater.

Are you on suspended or hard/concrete floors?

Reactions: 1

SteveCallas

· #4 · Aug 26, 2019

Research the BOSS in the theater forum. That is currently the best TR solution. You’ll thank me.

Russell Burrows

Discussion Starter · #5 · Aug 26, 2019

SteveCallas said:
Research the BOSS in the theater forum. That is currently the best TR solution. You’ll thank me.

I have a boss and i am on concrete floor.
I also tried a hoverboard boss with two thousand rubberbands that worked quite well when i stood on it barefoot but doing a m j fox in back to the future for two to three hours when watching a movie is not my thing.

I looked at my couch as the interface between my boss and my body.
Thus i am looking at other solutions to improve tr coupling from boss board to body.

The boss hoverboard test is in dedicated home theater.

My question is what decides the amount of tr transfered from boss board tobody via couch?
Thanks.

aron7awol

· #6 · Aug 26, 2019

It sounds to me like you're just looking for rigidity.

Russell Burrows

Discussion Starter · #7 · Aug 26, 2019

aron7awol said:
It sounds to me like you're just looking for rigidity.

Rigidity ?
I will run some tests but is the tr transmision due to direct rigid coupling betwixt the couch and the boss board or is the tr due to the couch acting more like the surface of a drum?

The boss boards i see react in left right wooble and front to back wooble but i assume that since earthquakes have up and down wooble then perhaps its also needed in a boss?

Anywho i will run some tests on three axis wooble boss when i can after september 6th.

aron7awol

· #8 · Aug 26, 2019

Assuming a TR device has a linear response, I would then want the seating to also behave linearly. If the seating is not rigid it may improve the response at some frequencies but also kill it at others. Many of us with suspended floors have dealt with this with our TR devices. In my experience, a suspended floor is a blessing with subs only as it adds serious TR in a pretty narrow band that wouldn't be there otherwise, but with TR devices it is actually a curse due to its non-linear behavior, and the TR devices don't need any help from the floor/seating.

Reactions: 1

Russell Burrows

Discussion Starter · #9 · Aug 26, 2019

aron7awol said:
Assuming a TR device has a linear response, I would then want the seating to also behave linearly. If the seating is not rigid it may improve the response at some frequencies but also kill it at others. Many of us with suspended floors have dealt with this with our TR devices. In my experience, a suspended floor is a blessing with subs only as it adds serious TR in a pretty narrow band that wouldn't be there otherwise, but with TR devices it is actually a curse due to its non-linear behavior, and the TR devices don't need any help from the floor/seating.

So i looked at several couches and they all have flimsy wooden bases.
If i add thicker wood to my couch framework will this increase in rigidity result in better tr linear response?

aron7awol

· #10 · Aug 26, 2019

Russell Burrows said:
So i looked at several couches and they all have flimsy wooden bases.
If i add thicker wood to my couch framework will this increase in rigidity result in better tr linear response?

I would look at the framing and determine if the force being applied upward from the platform will transfer through the (hopefully very rigid) framing to the actual seats without any significant flex. If there is something in that chain that could flex, yes, you could likely stiffen things up easily enough yourself.

Reactions: 1

Russell Burrows

Discussion Starter · #11 · Aug 26, 2019

aron7awol said:
I would look at the framing and determine if the force being applied upward from the platform will transfer through the (hopefully very rigid) framing to the actual seats without any significant flex. If there is something in that chain that could flex, yes, you could likely stiffen things up easily enough yourself.

Thanks and i am off to cut some mdf and redo my tv couch.
Off to test i go.

Reactions: 1

Bigus

· #12 · Aug 28, 2019

I think rigidity is the correct path. Ideally stiff wooden or metal bench or chair with no padding. The more flimsy the frame and the more supple the cushioning I think the less TR will be transmitted.

There surely needs to be some compromise to be comfortable enough for a lengthy movie session. But I think stiffening up the frame and perhaps swapping padding material for a denser and maybe even thinner foam is headed the right direction.

Reactions: 1

Russell Burrows

Discussion Starter · #13 · Aug 28, 2019 (Edited)

Bigus said:
I think rigidity is the correct path. Ideally stiff wooden or metal bench or chair with no padding. The more flimsy the frame and the more supple the cushioning I think the less TR will be transmitted.

There surely needs to be some compromise to be comfortable enough for a lengthy movie session. But I think stiffening up the frame and perhaps swapping padding material for a denser and maybe even thinner foam is headed the right direction.

Excellent and thanks.
Going to try this out in a few days.I added an extra board to my boss miniriser and stood barefooted on my 2.5 inch thick board and the tr was just really intense to the point of my saying thats too intense so now to try a better tr chair.

Russell Burrows

Discussion Starter · #14 · Aug 28, 2019

I have a question for everyone with a boss miniriser or boss platform.Please can you test how much shake level you feel when standing BAREFOOT on your boss ?
I am wondering whats Going on as it seems that barefooted on my boss is a Huge rise in tr versus my tv chair ?
Please can you test your tr level in chair [ buttometer ] then remove tv chair and retest barefooted standing on boss ?

Just wondering if there really is a difference ?
Thanks .

Sekosche

· #15 · Aug 28, 2019 (Edited)

Russell Burrows said:
I have a question for everyone with a boss miniriser or boss platform.Please can you test how much shake level you feel when standing BAREFOOT on your boss ?
I am wondering whats Going on as it seems that barefooted on my boss is a Huge rise in tr versus my tv chair ?
Please can you test your tr level in chair [ buttometer ] then remove tv chair and retest barefooted standing on boss ?

Just wondering if there really is a difference ?
Thanks .

I’ve done both standing and sitting with feet resting on my 6 driver boss. For me, the TR is way too intense and localized to that body part, especially around 25-35Hz, being directly coupled to the platform. The vibrations actually made my feet/legs numb when testing demo material from War of the Worlds and doing VibSensor measurements.

And this is from a guy that loves loads of TR. There’s definitely an uncomfortable zone where too much TR really is too intense and distracting if it’s not evenly distributed throughout the body. It was interesting to see if I’d like having the boss stick out in front as a footrest; I did not like it one bit.

This scene in WOTW in particular was just absurd how sharp the 30Hz felt with the feet on the BOSS, timestamp in the title:

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Reactions: 1

Russell Burrows

Discussion Starter · #16 · Aug 28, 2019

Thanks your data provides confirmation that my tv chair has too much padding so i will try less padding to get more tr.

Six speaker boss build ? I eventually will try an 8 speaker boss build ib318 v2 and powered by two behringer nx3000 dsp .

rms8

· #17 · Aug 28, 2019

If you're considering the platform option, I honestly think you'll do no better than what I have been building in my HT's for the last 2 decades....

https://www.avsforum.com/forum/19-d...8x18-ibsubs-28-8kw-finished.html#post28888650

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Reactions: 1

Sekosche

· #18 · Aug 28, 2019 (Edited)

Russell Burrows said:
Six speaker boss build ? I eventually will try an 8 speaker boss build ib318 v2 and powered by two behringer nx3000 dsp .

BOSS Build with 6 JBL 12” drivers https://www.avsforum.com/forum/showthread.php?t=3063116

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