Damping the analogue "setup"


Friends,
I am fighting this issue for the last 1 year or so with my TT setup. I am a beginner in analogue playback but I use some decent equipments to play music. My setup is:
Nouvelle Platine Verdier
Naim ARO Tonearm
Lyra Skala cartridge
RCM Sensor Prelude phonostage

All the equipments are placed on wooden rack (made of Ebony) with spikes. The problem is, the overall sound can vary vastly from lean-strident to round-warm very quickly based on what kind of spike base I use underneath the rack. A typical metal (aluminium, steel, brass) spike base makes the sound lean and fast to an extent where it really bites. Whereas using a softer metal (cast iron) or rubbery/woody substance below the rack makes for a slow and boring sound.

It is not just the turntable that reacts so severely but also the phonostage. Placing the phonostage on a softer or a more damped isolation footer immediately reduces the grit in the sound. I do not hear such drastic reactions from my preamp or power amp. My guess is, the complete analog front end needs some level of damping. How do you go about it ? How do you choose the platform that will support the turntable setup firmly so that the sound doesnt lose its energy but still damp it adequately ?

For the moment (thankfully) my ARO is an un-damped unipivot designed to work without any damping fluid.
pani
Just in case ,it hasn't been mentiooned already on this thread i suspect in most cases the best sonic results will be obtained with no rack, i.e., placing the components directly on the floor (on spikes). Most racks actually amplify and exacerbate the structureborne vibrations. Yes, I realize racks look cool and are excellent for organizing things. Another source of vibration, again, in case it hasn't been mentioned, is the acoustic waves generated in the room by the speakers, you know, depending on how loud the music is playing. Sound pressure Peaks in the room can be 6 to 8 dB or higher than the average level in the room.
I have found that Doug/D is right again. I live in Arzona with many dry riverbeds close by. In these beds lie rounded rocks. i was floored how these really help my electronics. I should post pictures of these 5-8 pound or so rocks. They look a bit silly on my amp, preamp, CD player, but boy do they help.
String,

Judging by the photo on Joel Durand's homepage, one of his tonearms would totally rock your world. ;-)

Seriously, a bowling ball on top of my washer or dryer provides a similar benefit. The additional weight lowers the frequency and amplitude of spurious vibrations, and it has nothing to do with vibrations emanating from the floor.
Seriously, a bowling ball on top of my washer or dryer provides a similar benefit.
Now there's an idea.....
Perhaps a cricket ball on top of the turntable will solve all structure-borne feedback problems?
Hi Pani - just saw your thread.

interesting that you got the TT to sound fast as it was sounding slow on your other Verdier thread ?

wall mounts are great as long as what you are bolting into is indeed part of the load bearing wall - not just 2 x 6 wood studs screwed to the wall that have been put up quickly on a frame by the builder. These move, are flexible and a very bad solution. I have friends who tried bolting to the wood studs, it didnt work well - they declared the wall mount solution as no good - which is obviously not the case.

fwiw - I recommend you try something that I feel is easy to do minimal cost and time.
Go to the building supply store and obtain a small sheet of plywood to make a box big enough to hold the motor and TT, a sheet of plastic to line the box and some sand (in bags).

Put up a temporary sandbox with the shelf your Verdier will be on leveled on it. If it works for you then a nicer one can be constructed.
The building suppliers of the wood will usually make 4 or 5 cuts for free for you as well from the plywood sheet.
Just bring your measurements to the store.
The sand comes in bags and is labeled as to be used in playgrounds for kids.
I use an elongated sandbox with my vintage Platine Granito.
My TT shelf is 14 inches up from the concrete floor that has an underpad and carpet on top.
It works really well.

Cheers and good luck.