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 Topic: Acoustical

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Bill333

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PostSubject: Topic: Acoustical   Sat Feb 25, 2012 1:33 pm

WORK IN PROGRESS
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Bill333

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PostSubject: Re: Topic: Acoustical   Sat Feb 25, 2012 1:45 pm

MATERIAL:

When we listen to sound in our rooms we are listening to air pressure. Sound waves are not traveling in a straight line to our ears. There are 2 main parts to what the sound pressure (build up) is doing. One, pressure zones, the other, laminar flow.

This constant build up of energy is in every room and is what you hear. As the pressure forms it makes pressure zones that you can easily listen to as you walk around the room talking or making sound. Some areas are at a plus signal and some at a minus.

Pressure Zone Controlling is what we have named taking control of a zone in the room and telling it what to sound like with the use of our acoustical/mechanical tuning tools.
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Sonic.beaver



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PostSubject: Re: Topic: Acoustical   Sun Feb 26, 2012 1:40 am


Hi Bill333

Very Happy you are a prolific writer!

Sonic got a question -- in your room of wood, when you go in, stand in the middle and shout "BOO!" what do you hear back?

Do you hear a tight cutoff like "BOO." Or does the sound go on a bit longer like BOOwoo but with no echoes? Where does the main source of energy of your room come from when you go BOO!?

I am fighting some overhang in my room and checking to see what other Zonees hear from their rooms.

Sonic
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Bill333

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PostSubject: Re: Topic: Acoustical   Sun Feb 26, 2012 7:37 pm

Quote :
you are a prolific writer!

Errrmm... Everything I posted is excerpts from Michael's postings.

I'd be glad to tell you about my rooms acoustics, but you'll have to give me a couple days. At the moment the room is sealed off while the basement gets drywalled.
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Michael Green
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PostSubject: Re: Topic: Acoustical   Fri Jun 01, 2012 7:33 pm

Golden Ratio

Is the golden ratio really so golden. Audiophiles have accepted the golden ratio as truth for years, but does this ratio really produce the sound we want? In"97" and again in "2001" we put this to the test. Our Ohio test was done by building to the ratios formula used by several audio guru sites. We followed the rules to the tee using the test equipment recommended to report the results. Engineers from Audio-technica were on hand to assist along with other spec addicts. The test begins with the rooms walls being made from drywall and paint. First the node test where the mics are placed in the room and the measurements are taken to see if they match the formulated results that golden ratio rooms are said to have. In the empty room it was virtually impossible to get measurements because of the amount of echo in the room. It was immediately apparent that if a room was supposed to be this size than it would also have to have a perscribed acoustical treatment fix to put in to balance out the echo. If this was supposed to be a quiet room than we obviously did something very wrong. This room was noisy and out of control on it's own. We checked to see if this was a fluke then discovered that in other rooms where testing was done there was acoustical treatment in the rooms. We all agreed that if this is a stand alone magical formula than there would be no need for treatment. This was a major red flag. Next we mapped out speaker placement and measured the results. We were more interested in consistency than the actual sound at that point. After taking our readings we setup up the room in 4 zones and recorded the nearfield, farfield and midfield results and the prescribe "golden ratio" placement. Odd how we collectively did not find the "golden ratio" setup to be the most enjoyable. A couple of weeks later we did the same testing with a prefinished wood wall that reacts much like plaster. With the same set of testing the results were completely different than the earlier tests with drywall telling us that the material has everything to do with the way the nodes and waves set up. Again the golden ratio room was unmanageable without treatment, but we did testing with and without. It was becoming clear that the golden ratio may not be as golden as we have been told. To our ears the prefinished hard material gave off a huge amount more tilted up energy than the drywall room did and the tests showed the same. These two rooms being the exact same dimensions (actually the exact same room with different wall coatings) were nothing like each other. There was nothing that told us that these rooms were the same dimensions according to test. And I might add that the only way we got them to sound close was to tweak in the acoustic treatment.Third and finally was the voiced wood with in-wall tuning. Even without adjusting any screws of the tuned wall it was easy to test and hear the differences. Again none of these rooms tested the same and the placement tests were all completely different convincing all of us that the ratio formula changes depending on the material used. With the tuned room we also hand the ability to alter the test results by tuning the walls.

In "2001-2004" we were able to do more of an extended testing of rooms where we made the materials of the rooms a bigger factor than the dimensions themselves, and even though we included the "golden ratio" in on the mix of dimensions we found other dimensions and mixes of materials to work very well. Surprisingly to most we ended up with rooms much closer to square than the earlier audiophile sources recommended. Another huge factor that comes into play that we hardly ever hear about in those golden ratio articles is the effect that equipment placement in the front of the room has on the sound. If you look at the golden ratio and add your typical equipment setups to the front of the room you will see that the ratio specs change dramatically from the basic ratio room "should be" specs. If you look at the typical high end audio setup with the equipment inbetween the speakers against the front wall and setup up your speakers according to the popular measurements provided by high ends best you are (according to us and others we had try it) going to run into some huge sonic problems. As a matter of fact we have found that by moving your equipment around the room you are able to change the "golden ratio" response dramatically.

Don't take my word, do it yourself. Those of you who have audio racks or stands inbetween your golden ratio speaker and chair setup get out your test equipment and see how far off you are. See the huge dip in low end? Your room is out of balance and the golden ratio no longer applies. Why? Because sound does not travel in straight lines like your audiophile experts are leading you to believe. Your system has very little to do with waves traveling in straight lines. Your rooms work off of pressure, and when you set something in the middle of that pressure you alter the sound. Audiophiles are living in the dark ages with this straight line thing. Go ahead stop reading this right now and go look up sound waves and sound pressure. While your at it look up sound wavelength and take a look at how conditions change sound wave measurements. For a person to tell you to put a speaker so far off of the wall without knowing the conditions of your room materials/sea level responce/air humidity & pressure is nuts. As I've said before even your tesst equipment measures differently when you change conditions.

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PostSubject: Re: Topic: Acoustical   Sun Dec 09, 2012 5:21 pm







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