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I Have Airborne Feedback And Never Realized It...Till Now

  While my ZYX Airy is out for a rebuild, I hooked up my CAL cd player/transport and started playing CD`s that I had recorded from vinyl using a Tascam 900.
When I do the recording, nothing is on but the TT setup and the recorder. Room is dead silent. No speakers

I`ve  been listening to a disc or two over the last few nights.

Last night, I was listening to a CD I made of Lindsey Stirling`s 'Shatter Me' LP
I was hearing so many odd/different sounds that I never picked up on before using the TT.

For example, I heard growling sounds (seriously) back ground noises and other THINGS that all were hidden when I was playing the TT.
This LP is Bass Heavy! Lots of energy in the air. With 3 15" subs I know that.

My TT is pretty much isolated IMO
I use a Rega wall mount bracket that is bolted to my equipment rack not the wall.
I have the TT sitting on a SRM isolation platform that sits on the Rega bracket
Concrete slab floor.

No doubt the cartridge is picking up on all energy that and resubmitting it.

This won`t be an easy fix I`m afraid..  :(



scm
optimize
164 posts
 
I do not think that any platform/turntable can make physics laws to disappear.

If as I guess most of us do not play TT and also have 3x15" subwoofers and are able to play far below 20 Hz..
That is little of a precondition here.. what I am talking about..

The goal in matching a specific cartridge and arm is to achieve a resonance in the 10 to 14Hz range. Some feel that limiting this range even further, to 9 to 11Hz, is beneficial in reducing the effects of resonance.

The following formula for calculating the resonant frequency of an arm/cartridge:

Resonant Frequency = 159/((M + CW + FW) * C).

http://www.mh-audio.nl/Calculators/RF.html
scm OP
314 posts
 
I`m going to try and isolate the TT somehow, using acoustic foam of some sort.
Not going to ditch the table for another one that`s for sure, sorry.

As always, you guy`s come through with pretty good even great advice. 
  
chakster's avatar
chakster
6,144 posts
 
Audio-Technica designed pneumatic insulators (AT-616) long time ago and this is still the best solution for turntables under 60kg weight. 
audioguy85's avatar
audioguy85
2,033 posts
 
Here is a far less expensive, not to mention easier way. Take some rubber grommets and use however many between the wall and the turntable shelf/mount. Upon tightening the screws/bolts (what have you) to the wall, the grommets will compress and provide the needed absorption, and or vibration dampening. Rubber washers would work as well....
millercarbon's avatar
millercarbon
12,531 posts
 
You did this?
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