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Equipment Set-up Recommendations?

Hi Folks:
I recently installed an air-bearing linear tracking tonearm (the MG-1). Table and cartridge are Teres 255 and ZYX Airy 3x-sb low output. Generally, I'm thrilled with the setup, but I find that when I walk around the room, the cartridge can jump, which is very disconcerting.

When I switch to the OL Silver arm I have, such jumping does not seem to occur, so I'm guessing the MG-1 is more sensitive. All my equipment is supported with the double rack, which may also be a variable to consider - I have my Teres on top - about 40 inches above the ground.

Anyway, I'd welcome any input or insight that migth provide me with a more stable, isolated listening environment where my cartridge won't jump (how bad is that for the cartridge anyway - should that be considered an emergency, or is it pretty common/not-a-big-deal? I've inquired about getting a Gingko platform, which may or may not help. Ideally, I'd like to keep the Teres on top of the rack, as it looks great, is highly accessible, and I don't want to take up more realestate with a seperate Teres stand, if I don't have to.

Anyway, any input and advice would be much appreciated. Thanks in advance!

John.
128x128outlier
sean
6,229 posts
 
Tracking at 2 grams should be plenty heavy for most any cartridge. Given that your pivoted arm seems to not have this problem, i would assume that it has something to do with the way that the air-bearing arm is installed. Then again, the pivoted arm may be experiencing enough side-wall thrust & drag that the friction "holds" the cartridge in place. Otherwise, if the arm / table truly are level in all three planes ( front to back, side to side and diagonally ) and the arm is installed properly, the table simply lacks proper isolation characteristics and / or the rack itself doesn't isn't nearly as good at isolating floor-borne vibrations as advertised.

Given that some of the most fondly loved and reviewed turntables suffer from such a problem, that part of the equation would not surprise me one bit. The fact that the Adona's support the shelves directly under the component also leads me to believe that it would transfer more energy than a rack that supported the shelves from near the edges.

The idea about mass loading the floor in the area near the rack may help somewhat, but you can expect it to change the sonics of the system for the worse too. That is, i think that you'll find that the sound will "dry up" quite noticeably and the bass will become far heavier and less distinct.

Personally, i would suggest going over the arm installation again. Please keep us apprised of what you end up doing to correct the problem as there are many others that are interested in this arm. Sean
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ozzy62's avatar
ozzy62
633 posts
 
For Gregadd

Mounting turntables in corners opens up a whole 'nother can of worms. Not a very good suggestion IMHO.

Oz
marakanetz's avatar
marakanetz
5,473 posts
 
a few solutions:
a) don't walk or dance or run during an analogue playback.
b) place an extra pannel under the rack stand.
ozzy62's avatar
ozzy62
633 posts
 
If you put the table on a Machina Dynamica Promethean Base, not only will you get zero footfalls, the sound will improve dramatically. I can't recommend this device heartily enough for people with unsprung turntables.

http://www.machinadynamica.com/

Oz
jayboard
301 posts
 
My Rega is perched about as high as your TT on a lightweight steel rack with Neuance shelf (suspended hardwood floor). Neuance is rigid and lightweight. I was very surprised how much it helped with heavy footfall/dancing issues. I wasn't expecting that. Might be worth a look.
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