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Below I posted about woofer pumping. I got that problem solved courtesy of you fine folks on Vinyl Asylum. I have a question in reference to outboard vibration and how it effects cartridges. Do you think that it effects low compliance carts. more than high compliance carts. My cartridge is a low compliance Audio-Technica and tracks at 3 gms. of force
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Plus 1 on comments by Jabs1542. If I read his post correctly he is referring to room acoustics...which mainly are concerned with airborne sound waves and the effects those might have on record playback.
Fwiw a solid floor and firm walls do contribute to better room acoustics.
re: airborne sound waves and the effects on a cartridge/arm system as it tracks the record groove.... An arm/cartridge mismatch make the effects even worse. Otherwise, any good arm/cartridge match-up will be affected by airborne sound waves according to the individual room acoustics.
Some basic rules....airborne sound waves tend to collect in room corners. Particularly low frequency waves (bass). Given that, it is a good idea to keep the turntable out of the corners. **
I can attest to this in my situation. I have a room with flexy trampoline flooring and flexy walls to boot. So, when looking for a place to mount a turntable and avoid foot-fall issues I found that this was possible by placing the turntable in a room corner. However this made the turntable vulnerable to acoustic feedback issues. Most people would say to find another room with more solid floors and firmer walls. However this isn't always possible in today's world unless you can afford to pay contractors to build a listening room that is acoustically correct.
There are many sites on the web that can offer guidelines toward getting your room into a more acoustics friendly condition. Also there is a book on the subject that speaks in plain language rather than engineer speak; "Get Better Sound" by Jim Smith. I have it and recommend it as an entry level reference/tutorial into the world of tuning your listening room.
Steve
** Using a decibel meter (cheapo Radioshack), in combination with the Stereophile Test CD #2, I have observed that sustained low frequency tones are at least 5 db louder in my room corners than elsewhere in the room. And my room has a slanted, vaulted ceiling (18 feet high).
I do have a RadioShack decibel meter. I will try it. Thanks for the info......
Careful with how you handle the info that the Radio Shack meter indicates; it's very highly directional, although perhaps not so much with extreme low frequencies. And of course it's not reading out frequency, just intensity.
It effects all cartridges...though at different frequencies
As long as tonearm and cartridge are synergistically matched, the compliance rating of the cartridge should not be an issue in and of itself, at least as far as outboard vibes are concerned.
It's more the whole picture as I see it. Rigidness of the rooms floor, quality of the audio rack and the gear. Use of isolation devices to improve isolation and reduce feedback. Keep experimenting.
ET
I don't have a direct answer to your question but think about it this way,I can't see the "bumps" in the groove. They are "microscopic".
I can't see the contact areas of a stylus, they are "microscopic".
Therefore a "microscopic" amount of vibration will disturb the interface between them.
It has been my experience that anything I can do to minimize vibration results in "better" sound.
I built a open frame turntable stand to minimize air borne vibration from being transmitted through the structure of the stand to the turntable.
The stand has pointed tip-toe feet that reach to the concrete slab floor.
The top of the stand has pointed tip-toes that hold two stacked 1" thick slabs of marble that my turntable sits on.
I built a stand alone motor assembly to reduce the amount of motor vibration reaching the platter/tonearm. (the turntable motor now sits in it's own lead filled pod and the only thing touching the turntable is the drive belt)
I remove the turntable dust cover when playing records to minimize airborne vibration.
If I could think of something else, within reason, that would further reduce vibration I would do it but I will not go as far as placing the turntable in a different room even though I'm sure that would be a good thing.
P.S. Jabs suggestion below is a very good one.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 02/07/16 02/07/16
A good general practice is to map out the nodes in your room, this is where bass is additive or subtractive. Then you try to place your turntable in an area where the node is subtractive (or tune your system such that a subtractive nose lands near your turntable). By all means validate that your turntable isn't sitting in an additive node. At that point you don't have enough musical energy present to affect the cartridge.
How to measure your room? I have a rig from XTZ (mic and software) that makes this very easy. However I suspect you could do the same with a test album and a smart phone - someone who has done this may chime in.
If you've never even thought of attempting this then shame on you for not working on your listening area, it is the second biggest game changer for the sound that reaches your ears (your speakers being the first biggest influence on what reaches your ears).
Sharing my experience and findings, not trying to tell people how to enjoy their audio (a.k.a. no grenades please).
A few times now I've suggested moving a turntable/arm away from a corner location where there will most likely be bass buildup. And I speak from experience. ;^)
"You can't know what the "best" is unless you have heard everything, and keep in mind that given individual tastes, there really isn't any such thing." HP
Edits: 02/08/16
For me it was under the cathedral ceiling apex along the front wall. My TD 125 w/balsa wood Rabco SL 8E was just three feet from the left speaker a six foot monsters that are three db down at 27. Not a peep of feedback. Solid floor too, I could bang my foot down and no driver movement.
ET
with some form of air bladder arrangement such as the microscope platforms or the opposed magnet type that eliminate solid contact of the tt/arm/cart setup to the earth is the best.
i can't remember the brands of the platforms but those are the best. with my SOTA Sapphire tt, i have no prob as the hanging springs do the job nicely, no platform.
...regards...tr
I think (could be wrong) that these guys are talking about airborne vibration via extreme low bass excitation. Platforms cannot eliminate that sort of feedback, at least not entirely.
Structure borne vibrations VS air borne, so different solutions are needed.
"You can't know what the "best" is unless you have heard everything, and keep in mind that given individual tastes, there really isn't any such thing." HP
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