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prime isolation

PostPosted: Sun Dec 18, 2016 12:47 pm
by elader
hey Harry.

so when u was running the scout II with classic feet it really seemed that the feet did an excellent job at isolating the table from the mapke support. the primes feet couples the tabke tightly to the maple platform. Ive got the block sitting on racquetballs. does it make any sense ti put sorbothane under the tables feet? does that just defeat thge purpose of the feet?

Re: prime isolation

PostPosted: Mon Dec 19, 2016 5:03 pm
by Jinohio
I had sorbothane discs under my Prime when I first got it but found that it sounded and performed better without the sorbothane.

Re: prime isolation

PostPosted: Mon Dec 19, 2016 9:25 pm
by Brf
elader wrote:hey Harry.

so when u was running the scout II with classic feet it really seemed that the feet did an excellent job at isolating the table from the mapke support. the primes feet couples the tabke tightly to the maple platform. Ive got the block sitting on racquetballs. does it make any sense ti put sorbothane under the tables feet? does that just defeat thge purpose of the feet?


Sorry, you are correct, it does not make sense. The Prime's cones couples the table to the platform. By placing sorborthane under the cones, you are uncoupling the table from the platform.

Re: prime isolation

PostPosted: Tue Dec 20, 2016 10:09 am
by elader
Brf wrote:
Sorry, you are correct, it does not make sense. The Prime's cones couples the table to the platform. By placing sorborthane under the cones, you are uncoupling the table from the platform.


I am kind of surprised at how well a rap on the maple transmits through the cartridge, but I guess 'tight'y coupled' will do that.

the racquetballs under the maple block are ok to insulate the whole mess from the rack right or should the maple block be firmly anchored to the stout metal rack?

Re: prime isolation

PostPosted: Tue Dec 20, 2016 11:45 am
by thegage
elader wrote:I am kind of surprised at how well a rap on the maple transmits through the cartridge

I have yet to find a good isolation system that doesn't transmit a "rap" to the cartridge, which is why I don't find the rap test a very good indicator of performance.

John K.

Re: prime isolation

PostPosted: Tue Dec 20, 2016 12:25 pm
by audiom3
It is my understanding that the maple platform is supposed to absorb the energy from the TT. The isolation should be the platform/TT combo (isolation occurring below the maple platform).

Re: prime isolation

PostPosted: Tue Dec 20, 2016 12:51 pm
by 10ovr
thegage wrote:
elader wrote:I am kind of surprised at how well a rap on the maple transmits through the cartridge

I have yet to find a good isolation system that doesn't transmit a "rap" to the cartridge, which is why I don't find the rap test a very good indicator of performance.

John K.
Im using McMaster inflatable vibration damping mounts in some wood cases under my TT maple and it makes one hell of a difference ,Wider sound stage ,You can tap the hell out of the lower rack and get nothing through the speakers Image

Re: prime isolation

PostPosted: Tue Dec 20, 2016 3:44 pm
by thegage
10ovr wrote:I'm using McMaster inflatable vibration damping mounts in some wood cases under my TT maple and it makes one hell of a difference ,Wider sound stage ,You can tap the hell out of the lower rack and get nothing through the speakers

No doubt, but if you tap the upper platform you will hear the noise through the speakers, and that upper platform is still exposed to air-borne vibrations. Any reason why you don't eliminate the VPI feet and use the McMaster mounts in their place?

Re: prime isolation

PostPosted: Tue Dec 20, 2016 6:59 pm
by audiom3
thegage wrote:
10ovr wrote:I'm using McMaster inflatable vibration damping mounts in some wood cases under my TT maple and it makes one hell of a difference ,Wider sound stage ,You can tap the hell out of the lower rack and get nothing through the speakers

No doubt, but if you tap the upper platform you will hear the noise through the speakers, and that upper platform is still exposed to air-borne vibrations. Any reason why you don't eliminate the VPI feet and use the McMaster mounts in their place?

If you do that, then what's the point of the isolation platform? You want the bond between platform and TT. It helps mitigate vibrations due to the added mass. Below the platform is where the isolation should occur.

Re: prime isolation

PostPosted: Wed Dec 21, 2016 7:38 am
by hedgehog
AudioM3 has it right IMO. You want to isolate platform from rack/shelf and couple 'table to platform.

I use a 3" maple platform, which used to sit on 1/2" sorbothane squares, that I now have on the Mapleshade Isoblocks. I am experimenting with stock vs mini-HRX feet on my Aries Scout, and may experiment with the EdenSound Terracones as well.