Your Home Theater ULF Score - Page 167 - AVS Forum | Home Theater Discussions And Reviews
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post #4981 of 4988 Old 05-18-2017, 12:32 PM
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Originally Posted by dominguez1 View Post
Is that the lowest tune you could get? I thought your 8 SIs had a 7hz tune?

That is what I designed for but the enclosure is at least 50 cubes bigger so it will probably end up 8hz or lower in my room.

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subs 2 XXX ported SLLT powered by IPR2-7500.
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post #4982 of 4988 Old 05-18-2017, 03:48 PM
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Originally Posted by dominguez1 View Post
Yep! Your subriser must completely go through that futon cushion...having more dense seating wouldn't get you the same result!
Not necessarily.
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post #4983 of 4988 Old 05-18-2017, 07:09 PM
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Originally Posted by coolrda View Post
Not necessarily.
This is a maybe but, a heavier couch may adhere to the rise. The same fore will be transmitted. The couch will shake a bit less but, sence energy does not disappear, it has to go somewhere, the occupant of the seat.

I say this because a few folk with riser have demo'ed my HT which, is on concrete and are amazed at the force coming to the seats.
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post #4984 of 4988 Old 05-18-2017, 09:26 PM
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Originally Posted by derrickdj1 View Post
This is a maybe but, a heavier couch may adhere to the rise. The same fore will be transmitted. The couch will shake a bit less but, sence energy does not disappear, it has to go somewhere, the occupant of the seat.

I say this because a few folk with riser have demo'ed my HT which, is on concrete and are amazed at the force coming to the seats.
What I was referring to was the seat testing I did where I changed the support from rubber to jute to MDF. My thought would be if rubber is a 2 and jute is a 5 then mdf is a 8. Not so. If I remember correctly it was MDF 2 rubber 5 jute 8.

Now to your point. Its quite possible that in the end good ol' concrete is the best option. Riser most definitely have a resonance. Couldn't they have a null as well? I'm thinking more and more about removing my riser.
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post #4985 of 4988 Old 05-19-2017, 09:51 AM
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My main point was some energy is being lost from the seat between the coupling of the couch and riser. Isolation feet and keeping the couch in solid contact with the riser is of benefit. There are to many variables to say with certainty. I am not discounting the study on risers done early in the ULF thread. Riser vs concrete will have different emphasis on seat movement vs energy transfer to the person sitting.
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post #4986 of 4988 Old 05-19-2017, 12:33 PM
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Originally Posted by dominguez1 View Post
^^^This.

It's definitely a balancing act. Too much TR and Intensity can take away from other nuances of the HT experience (weight, pressure, snappiness, detail, etc.). It's analogous to running your bass to hot...run it hot enough and you start to lose detail from your mains, surrounds, etc. as the bass becomes so prominent, it overpowers everything.
I agree with your summary and with the posts you quoted in making it. The only thing that I would add is that the appropriate balance at any given time may not necessarily be a static one. Like several of the other posters, I may choose slightly different things to emphasize, depending on the content, and on my own mood. A couple of people noted that they don't max out their volumes all the time. With me, it's partly a matter of the mood that I'm in. Some days it's fun to really let it rip with loud volumes and low bass, and on other occasions I might be content with lower volumes and less low bass.

As SBuger noted earlier, the listening volume can affect the equilibrium between mid-bass and ULF, due to the way our hearing works (the Equal Loudness Contours). So, for instance, if I leave my subs at the same +15 setting when I am listening at -10 MV, and at -15 MV, I will hear relatively more ULF at -10, and relatively more mid-bass at -15, because we hear mid-bass frequencies more easily than we do lower ones. Depending on what I'm in the mood for, I may just raise or lower my master volume to change the acoustic balance in the way I want it for that particular movie or mood.

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Mike
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post #4987 of 4988 Old Today, 07:01 AM
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Quote:
Originally Posted by derrickdj1 View Post
This is a maybe but, a heavier couch may adhere to the rise. The same fore will be transmitted. The couch will shake a bit less but, sence energy does not disappear, it has to go somewhere, the occupant of the seat.

I say this because a few folk with riser have demo'ed my HT which, is on concrete and are amazed at the force coming to the seats.
Your saying better/heavier seating will be better on a riser and even better on concrete than cheaper/lighter seating. I could be wrong but I'm starting to think the same way. I'm sold. Even if its not a quantity improvement, a quality one, would as much or more welcome.
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post #4988 of 4988 Old Today, 09:55 AM
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I do like when I shake more than my chair and I do like the quality of bass better on concrete than the riser. My two XXX 18s equal my 8 18 wall!
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