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Turntable Setup advice requested

This is similar to a previous post of mine, but it is a different question.

Basis 1400
Rega 900 Arm
Benz Lo4 cartridge.

The turntable sits on a stand made up of approx 100 pounds of cement.
Three large Bolts are the stand's feet (and leveling device).
1/4 in. plexiglass dust cover sits on weatherstripping on the cement turntable stand.

The cement turntable stand sits on the floor in the basement, which is the "audio room"

Questions:

1)
Should I put "tiptoes" on the Bolt heads so the three "feet" of the cement turntable stand can punch through the carpet and padding to make contact with the concrete floor?

Or

Should I leave the "Bolt Heads" flat and let the carpet/padding do some "decoupling"?

2)
Since the Basis 1400 has no real suspension, should I buy a product (I'm sure one exists) that should go under the Basis tt's feet?

3)
Is my cement turntable stand a bad idea?
Is there a better approach?

Thanks,
Steve
rotary914
3 responses Add your response
kel34
64 posts
 
I have my table on a homemade cement stand on a cement basement floor. Wouldn't change it for any stand period for when I did I got skips like crazy. I think your on the right track here.

I found putting three cones under the table upside down made a sizable improvement and drained off any vibration that was present.

I think an even better approach would be to mount an existing stand or a DIY one right to the foundation of the house. Seeing how it is the basement who cares what it looks like.

My future plan is to do just that with all my components using 2 by 4's and patio slabs as the stand mounted to my foundation and eliminating the floor completley.

Should be better or as good then any stand or isolation device out there
auaarons
94 posts
 
Assuming that your table, arm and cartridge are set up correctly:

100 pounds of cement stores a lot of energy. With the bolt heads sitting on carpet, the carpet decouples the cement stand from the floor and this energy has no where to drain. Your turntable, having no suspension, becomes part of this energy block. The result is the turntable getting upset by the large amount of energy it cannot dissipate.

Suggest you experiment with a light weight but rigid stand with spikes or tip toes to pierce through the carpet. Then try using tip toes or sorbothane feet under the turntable to see which works best.
dan_ed
2,451 posts
 
You might ask A.J., basis_info@basisaudio.com. He's always been very helpful to me. I know it is not cheap, but I think I would upgrade to a 2001 to get the damped suspension before trying something else under it. Just my .02
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