Next up: What is room pressurization?

[microstrip]

Room pressurization is not an audiophile concept it has a clear, physical reality and meaning.

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!

 

[Bruce B]

A room is pressurized before the music even starts (or between tracks) on an LP. You don't need music to pressurize a room.

 

[FrantzM]

A room is pressurized before the music even starts (or between tracks) on an LP. You don't need music to pressurize a room.

That would suggest a very serious amount of rumble and a system capable of passing that rumble.. We may be talking about different things ...

 

[NorthStar]

A room is pressurized before the music even starts (or between tracks) on an LP. You don't need music to pressurize a room.

That, I experienced as well, from my LPs spinning on my turntable,
and even before the cut needle hits the beginning of the encoded musical grooves.

 

[garylkoh]

A room is pressurized before the music even starts (or between tracks) on an LP. You don't need music to pressurize a room.

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.

 

[NorthStar]

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'.

* Real?

 

[garylkoh]

Bob, you're relatively near by. Next time I have a pair of G1's playing in, I'll send you an invite.

 

[FrantzM]

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 ..

 

[fas42]

Sounds like low level, low frequency, ambient noise: Jack's personal favourite!

Frank

 

[Ron Party]

When you can have twenty-four 12-inch woofers on the Genesis 1, you can generate any pressure you like.

My kind of guy!

 

[fas42]

Haaah! Baby stuff ...

http://www.youtube.com/watch?v=o36Kp6veJ6c

Frank

 

[NorthStar]

Bob, you're relatively near by. Next time I have a pair of G1's playing in, I'll send you an invite.

What's an invite Gary? Like an invitation?

Near by? As in nEAR field? :b

24 times 12" woofers? Wasdat Gary? :b

* Are you trying to pressurize me? :b

 

[microstrip]

A room is pressurized before the music even starts (or between tracks) on an LP. You don't need music to pressurize a room.

I think I know what you mean.

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.

 

[Steve williams]

A room is pressurized before the music even starts (or between tracks) on an LP. You don't need music to pressurize a room.

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

 

[NorthStar]

Haaah! Baby stuff ...

http://www.youtube.com/watch?v=o36Kp6veJ6c

Frank

Frank, behave yourself! :b

 

[Phelonious Ponk]

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

 

[NorthStar]

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?

* Do you have a turntable?

 

[Phelonious Ponk]

Do you feel it before you put the needle down?

Tim

 

[Robh3606]

I have heard the "pressurization" from a lead in grove but I always attributed it to low frequency noise. I never saw it as desirable just noise.

I also said that I have never experienced it with digital.

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.

Are we all talking about the same thing??

Rob

 

[NorthStar]

Do you feel it before you put the needle down?

Tim

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.