May be I understand you. Are you just addressing this mode of driving a room bellow fmin that is given by the maximal dimension of the room and where there is no modal boost? And then all the issue is about extending response bellow this frequency? I think I have seen it called pressure zone. Then this is room pressurization!
Is it "pressurization" - or is it an impalpable presence that you feel? I don't like "pressurization" because that has to do with SPL - and before the music starts, the SPL should be close to zero. And it's not rumble, because I don't see the woofers moving. When you can have twenty-four 12-inch woofers on the Genesis 1, you can generate any pressure you like. But the "presence" of the musicians/performance venue - that's different.
Gary, in my own personal experience, it was pressurization at the ears and overall body level.
But then, it could have been a 'perception' of pressurization.
No, it wasn't a perception; it was reel!*
And my guess is a combination of the Gain from the amplifier with the two loudspeakers' x-overs,
mechanical drivers, and the cartridge of the turntable registering the electrical gain of that totality.
Hence pressurization of the room that you can physically experience.
I am not a scientist; I'm only reporting the facts ThaT I have experienced in my own 'demeure'.
Gary curiosu about one thing the woofers on the Gen 1 are they in dipole or monopole config?
I am with you that in the case of an LP (any medium, really) the SPL has to be zero , ideally... if it is rumble then that would be another huge problem if the level was sufficient to pressurize a room ..
IMHO it is not vinyl wow and flutter - sometimes you "feel" the faders going down and up between the tracks after the music stops - and when they are down the pressurization goes off.
This was the point I was trying to make at the very beginning so I guess terminology is incorrect because I understand what Frantz says but Bruce is echoing my post
Is it an "impalpable presence"? I don't know
My point at the beginning was tape provides that "what ever it is" over any other medium. I also said that I have never experienced it with digital. So let's start an "understandable" definition for what I was saying because it is indeed different from the point Frantz was making--which I completely understand--but different
Now I know we're talking two different thIngs (at least). And this pressurization you feel before the music begins? Come on guys, you are reasonably rational men...it's either noise or imagination. What else can it be?
Tim, it is definitively some type of pressurization, modal waves excited, and that you can truly feel.
Maybe not modal waves, but electrical properties in relation to the loudspeakers' drivers (subwoofers), and I swear the turntable cartridge is communicating (propulsing) electrical impulses from perhaps the low rumblings.
...Through the drivers' electromotive force. Out of phase? Back EMF?
You have me scratching my head with that. What I am talking about is there in any media provided there is enough low frequency content that is both low enough and high enough in amplitude. Have you done LF set-up with any sine sweep sources and an example. Basically as the frequency falls the perceived pressure increases and when you get into the lower 20's it's more a shudder than a constant pressure like before.
Yes, just like Bruce said. ...The turntable has to be on of course, and the closer the needle approaches the record and start its circling magic trick around the vinyl, the more intense it becomes.
Then you go sit down, just before the music plays and you can feel it, and between tunes too, just like Bruce said.
Me I always thought it has mainly to do with phase at lower frequencies.
But I believe it happens also at higher frequencies as well (mids and highs).
I'm just not an expert, but sure would love to hear from one with certitude though.
