7 hz at 140 db would be life changing. Remember, there's a reason why church organs can hit 16 and sometimes even 8 hz at high spl. It's literally a religious experience. Do some research on why churches have organs, you might be surprised. They put you in a certain state of mind same as rythmic drumming and chanting did for ancient civilizations (and still today in some places).
Yeah i know, sorry bad habit!
we'll use the more precise HERTZ in this thread from now on.
I'm just not used to users on this forum (and other hifi or audiophile forums) that are even interested in the slightest to anything below 20hz... I guess that's pure HT forums stuff.
I have a background of SPL (car audio) and HiFi where most life barely starts at 30hz if not higher
No, please no. 7hz @ 140db would be life changing in a way where your liver is taking the place of your left lung.
I remember a guy who was doing SPL competition at the wrong frequency (poor SPL results)... somewhere in the 32-35hz region, 148db. Was really
Much more than any 155-160db i ''heard'' in higher frequencies.
But, hey, what do i know? Maybe 7hz is completely harmless at high SPL. I just don't want to guinea pig it
So Jon, basically you just want to speculate and ask questions? You don't really want to look at the data to see for yourself. It's really not that difficult and would be very useful for you, and others to see the LF content is recent movies.
I can help, if you want to do the work. Otherwise it's just conjecture.
I can help, if you want to do the work. Otherwise it's just conjecture.
No, please no. 7hz @ 140db would be life changing in a way where your liver is taking the place of your left lung.
I remember a guy who was doing SPL competition at the wrong frequency (poor SPL results)... somewhere in the 32-35hz region, 148db. Was really
Much more than any 155-160db i ''heard'' in higher frequencies.
But, hey, what do i know? Maybe 7hz is completely harmless at high SPL. I just don't want to guinea pig it
At single digit frequencies 140 db is pretty benign. Your hearing is very insensitive down there. Astronauts are assaulted with about 180 db at low frequencies at takeoff IIRC and they all come out just fine. This is not something that is loud, it is something that is felt. 32 hz is a MUCH different story.
Oh come on, man! You're saying that like if 18's kits were sold at Wal-Mart!
Most people, most audiophiles, are impressed by a bass output anywhere north of 90db, and that at 35hz or up...
You're talking Mclaren 720S (or downright F1 stuff) while people are excited by a sporty steering wheel on their Toyota...
I sure get you, and i'm very interested in your comments, but I AM out of touch with user goals? REALLY?
So i missed few episodes, we're now looking for 6hz ?
Not two weeks ago Pano was looking at me with crossed eyebrows because i was talking 105db @ what? 30hz? And now i'm the old granny? Oh, well.
Just above you, there is a message about nausea.
Just sayin'.
Yay, i already like that thread, it's gonna be tons of fun.
50 kw has a price. Last time I ask at the corner store.
Heck I'm cool with 80 db at 0 to 10hz and 100 db for 11 to 20hz. I like my organs. Lol
Yeah, the price is about $800 all in (shipping, taxes, everything) for 14000 burst watts (just under 4000 watts sustained indefinitely).
FP14000 Class TD Professional Power Amplifier - Buy professional power amplifier, class td power amplifier, FP14000 professional power amplifier Product on Sanway Professional Audio Equipment Co., Ltd.
3 of those amps would give you 42000 watts (burst) and cost about $2400. 50 of the SI 18s would cost $8000. What does the rotary sub cost? $18000 IIRC? So go the conventional driver and amp route for $10400, blow the rotary sub right out the back wall and you still have enough $$$ left over to buy a nice used car.
80 db at 10 hz is completely useless. You won't hear or feel anything at all.
Data of what, Pano ?
Don't you follow the thread ? Our friend Just a guy is giving us plenty to analyze, including links about all stuff that is happening outside our little audiophile's universe. I'm sure learning a lot (thanks Just a guy, seriously), do you Pano ?
6hz, Pano. SIX FCKIN HERTZ. Is Joe Morello was doing 6hz stuff? No. But Hans Zimmer, yes!
Which makes me think about ISO 226: 2003 revision.
Should it be revised again?
What equipement will they use?
Pain threshold might be very high, unless you count in nausea. Or, i don't know, instant cerebrovascular accident ?
I seriously wouldnt bet on the single digit frequencies being harmless at even moderate SPL. Especially on the long term.
Just above you, there is a message about nausea.
Just sayin'.
Yay, i already like that thread, it's gonna be tons of fun.
Yes, there can be nausea, anxiety, depression, and any number of other side effects. But mostly that affects people that are very susceptible to low frequency noise and/or people who don't know where the sensation is coming from.
On the other hand, it can also cause elation, euphoria, religious rapture, and exhilaration and ecstasy. (Why are all the fun things e words?)
Like any other drug it affects different people differently. But I guarantee you it will touch you in some way.
We're not even allowed to talk religion on DIYaudio, but what happens when it involves directly a sound system effect?
Pano?
Go over to AVS and you'll see a thread with many movies measured with Spectralab and similar with info <10Hz. One OTTOMH example is Black Hawk Down; in the Fíng Irene scene the chopper blades are at 7Hz and very loud. When you hear a system that can actually play this back loud, it gives a completely different experience than a system high passed at say 20Hz. There are guys over there with 32 x 18" bass drivers like UM18's.
I personally use 4 FTW21's (21", 36mm Xmax one way) drivers in 1830cf (room volume) in my combined HT/2ch system. Whilst overkill for most music, as most music has little below 40Hz, it's wonderful for HT. My mains are flat in room to 40Hz, so I don't need the subs for music, they integrate very well and are used most of the time. If there is <20Hz 'rubbish' in the signal, I have a DSP setting to add in a steep HPF there.
I don't get the need for these sort of threads. No matter what a consensus results in, I'm going to build what I want to use irrespective of anyone else's opinion on the subject.
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Brett - There is no point to threads like this but hand waving and conjecture. Jon asks a question in the opening post, but doesn't really want answers. He's rather do off go off on flights of fantasy.
FWIW, I don't know the LF content of movies, so I thought it might be interesting to find out. At least one person in this thread is giving us some good answers.
FWIW, I don't know the LF content of movies, so I thought it might be interesting to find out. At least one person in this thread is giving us some good answers.
We're not even allowed to talk religion on DIYaudio, but what happens when it involves directly a sound system effect?
Pano?
I'm not talking about any specific religion or promoting or denouncing religion in general. I'm just stating some pretty well known facts about drumming, chanting and low frequency notes. This is backed up by science. Here's study done at Stanford university.
Brainwave Entrainment to External Rhythmic Stimuli: Interdisciplinary Research and Clinical Perspectives
Notice these interesting quotes.
You know what is also 4 - 4.5 beats per second? A single digit frequency sine wave. (I'm not going to do a separate search for church organs, it's pretty widely known what effect they have.)
This is science, not religion. And organ notes have the same effect.
Search for brain entrainment and the role of organs in churches.
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