Fidelity Research FR-64 vs. FR-54

Dear @thekong : Look, I never said that air borne does not produce vibrations/distortions. In the other side, I already did it that test.

Dear Raul, great! So, did you hearing complete silent or a faint sound of music through the headphone in that test?

The bass waves of fundamental notes in the 1812 cannon shots ( 8hz-16 hz. ) through a home system can't impact your chest because are not " builded, yet. . Are to big waves ( a little different in an open enviroment as how those shots were recorded. I have not this live experience, so I can't tell you about. ). These big waves normally came from the floor up and depending of that system/room handling is how you will feel it. If you can feel it in your chest then what you are feeling could be some of the overtones distorted by that bad system/room management. Those overtones came developed from the fundamental notes. Maybe your system can't even ( electronics. ) reproduce those frequencies or your speakers and that's why you can't live today my experiences.

Your theory about big waves can’t be “build” in a relatively small room (as compared to open space) just can’t be true. As bass is more or less pressure waves, it would expanded in all directions. As I learned from Discovery Channel (or was that National Geographic?) that many of the hand-held antitank missiles cannot be fire within a house, as that would create over pressure which could hurt/kill the operator. So, you theory of not feeling the pressure because of the relatively small room is just false.

Actually, bass or not, any sound wave, including the treble, would impact the turntable system and create feedback and, therefore, distortion. Only that the bass, which carries more energy, would have a bigger affect. You just can't fight the physics.

You, me and every one need to have facts on hand not theories or just opinions on what we think about. Where are those facts?: FIRST HAND EXPERIENCES IN SIMILAR CONDITIONS.

Well, I assume you have not fire a live cannon in your room, most likely not even a bass drum, so how do you know they could not “build” the pressure in a room? Where are those facts?

Recently, the movie "Heist", with Robert DeNiro et al, was shown on one of my cable channels.  In that movie, DeNiro cracks an otherwise impregnable safe by first drilling a hole in the top, then filling the safe with water.  He then drops a small explosive charge into the water-filled, sealed safe.  This results in the bursting of the safe due to the lack of compressibility of water, much as you say would happen if you fired off an explosive in a small house.  But I think there is a difference between dissipating the energy and hearing the extreme low bass frequencies.  I think you do need "space" in order to propagate the frequencies as audible sound, where the wave length exceeds the dimensions of the closed environment.  So, in a small room, you might get the worst of both worlds: unwanted energy that can feed back upon the equipment and failure to reproduce the sound as music.

Lewm/The Kong,
I agree that some of the claims of flat response in room on this forum are doubtful where the listening room is small. I have even seen one claim on this site that a system using pair of Acoustats in a room not much bigger than a broom closet can reproduce bass flat down to 20hz in room. Furthermore full range systems often "overdrive" small rooms. ( For Rauls benefit, this is not conjecture, I have learned this from experience in setting up 100's of systems ). In my own case my listening room is 37'x15' with a high stud ceiling and the benefits when shifting the system from a smaller medium sized room were obvious.
Similar experiences shifting turntables around the room relative to the speaker position have resulted in reduced distortion in my experience - this is not rocket science - it is simply finding the least resonant environment for positioning a mechanical device that measures minute groove modulations in motion. In my experience locating the TT between the speakers is second only to "behind the speaker" or corner location  in inducing distortion into the playback.

My second system is located in our very large finished basement.  I notice a benefit vs our living room, where system one resides.  Plus the poured concrete floor of the basement helps a great deal.

Dear @thekong : First and as I told you I do not disclose about the test I did t and that you suggested till you make something in your overall system to make some tests of all of what I posted in this thread.

If you are feeling through your system listen sessions that " something " is hitting your chest that it's not low bass but mid-bass or high distortions somewhere.

Even if the bass wave is builded no one can hear it trhough ears but only hear through the whole body.

Many years ago some music/distortions waves hit my chest: not any more and I have to tell you that nothing rattle in my room even at over 100 db SPL ( I'm talking of low bass. ) and in the past ( not so long time. ) I feel those waves through my legs and with some rattle somewhere in the room. Today there is no rattle and the bass waves hit me mainly at my middle of part of my back and sometimes at the same heigth at my body sides. As I posted here or somewhere my room " disappeared ".

Yes, SPL is always a real problem in any room. With out it we can't hear and fell nothing. Things are that even very high SPLs are handled by system/room with an unexpected aplomb and the main reason is that that system/room works with distortions at minimum.

A  gentleman posted in other totally different thread this:

https://forum.audiogon.com/discussions/my-personal-experience-with-direct-drive-versus-belt-drive/po... 

in the last two senteces we can read:


"""  This makes me think some people do like pleasant distortion  . Remember ignorance is bliss until you have heard the difference .  """

that's part of each one step in the audio/music learning ladder. Difference is that that specific step ( on what I posted. ) I passed before you and other gentlemans. You can't understand what you do not experienced ever and for you there is no reasonable explanation and that's why you think I'm wrong and other that I'm really crazy or whatever.

Regards and enjoy the MUSIC not DISTORTIONS,
R.