I returned the Grail after an in-home demo. It was the unbalanced version.Three Grails - which model do you have?
I returned the Grail after an in-home demo. It was the unbalanced version.Three Grails - which model do you have?
Technically putting that much solid stuff under gear will mean that vibrations from the gear itself will be reflected back into it. I have no doubt that could give some results you're getting. They will be of a different nature than what your rack may have potentially been catching from the air (if anything). And anything coming up from the ground will be higher in frequency that makes it to the equipment than before due to the nature of stiffness of stainless steel.
I'm interested to see what they look like cleaned up. Right now they're a little more... artsy.
If you have two racks? You would want to make them weigh the same amount so they'll reflect the same amount from stuff coming up from the floor. If one weighs less, it'll absorb more of what the heavier one is reflecting.
Thanks Folsom. The sound is cleaner now and I prefer the tonal balance. It was a bit thin before. It is now fuller, richer and has more body. Dynamics are also slightly improved. I am actually surprised at the difference this made. It is an ongoing project and I will see what adding the other three plates will do. I've got lots of solid metal under my turntable, 300 lbs worth, so are you saying the vibrations from the turntable motor are being reflected back into the table/bearing/platter/record/stylus?
Is the motor attached to the table in some way? I'm not familiar with the underside of that table. It may not produce a significant amount of vibration to begin with, but whatever it does is certainly reflected back to it, and perhaps whatever it's touching.
Yes, the motor is on the lower chassis on adjustable hard vinyl or plastic mounts. It is isolated from the main/upper chassis with arm and platter via four suspension towers. I feel absolutely no vibrations, and have no idea whether or not they are reflected back or if those reflections manifest themselves in what I hear out of the system. The phono stage is separated from the steel plate on which it sits by the four stock rubber footers.
Are you saying vibrations from the phono stage travel through the rubber footers hit the steel plate, and then are reflected back through the rubber footers to effect the sound of the phono stage? I do not know how to measure that or if I hear any such effect. The steel plate is meant to mass load my birch plywood DIY rack shelf which seems to dampen the sound and reduce harmonic overtones from the music. It sounds better with the steel plate underneath. I plan to try three more under the other Pass boxes on my rack.
Thanks Folsom. The sound is cleaner now and I prefer the tonal balance. It was a bit thin before. It is now fuller, richer and has more body. Dynamics are also slightly improved. I am actually surprised at the difference this made. It is an ongoing project and I will see what adding the other three plates will do. I've got lots of solid metal under my turntable, 300 lbs worth, so are you saying the vibrations from the turntable motor are being reflected back into the table/bearing/platter/record/stylus?
Over-dampening made the sound thinner, and reducing the dampening made the midrange fuller?
Hello Ron. I don't know what you mean by "over-dampening". The sound has changed since I added the mass of the thick steel plates between the the thick birch plywood shelves on my DIY rack under the phono stage and now preamp. DDK describes the steel plates as mass-loading the rack. Perhaps the bare wood shelves had a dampening sound. I don't really know. The result is that the midrange sounds fuller and the overall sound is less thin. Clarity has also improved. This is a work in progress and very "DIY".
BTW, will you not be getting ddk's Nothing Rack for your system once it is set up? That is a massive, ultra heavy steel rack system. Mine is becoming but a mere hint of that creation.
Yes, the motor is on the lower chassis on adjustable hard vinyl or plastic mounts. It is isolated from the main/upper chassis with arm and platter via four suspension towers. I feel absolutely no vibrations, and have no idea whether or not they are reflected back or if those reflections manifest themselves in what I hear out of the system. The phono stage is separated from the steel plate on which it sits by the four stock rubber footers.
Are you saying vibrations from the phono stage travel through the rubber footers hit the steel plate, and then are reflected back through the rubber footers to effect the sound of the phono stage? I do not know how to measure that or if I hear any such effect. The steel plate is meant to mass load my birch plywood DIY rack shelf which seems to dampen the sound and reduce harmonic overtones from the music. It sounds better with the steel plate underneath. I plan to try three more under the other Pass boxes on my rack.
I mean whatever you mean from your Post #963, above:
"I think the birch plywood and glues in my DIY audio rack were over dampening the sound and sucking some life out of it."
Since you are putting the tonearm pod out of the SME turntable, half bypassing the suspension, any extra very heavy mass will probably improve the sound quality of your system. The words "mass load" sound nice and impressive, but are too general and vague to explain the purpose of the steel plates. And as Folson referred, the processes of energy transfer that also contribute to the sound quality must consider acoustic impedance. Any way , what matters most is what you report on your listening - I hope your back does not suffer when you add more or heavier steel plates!
The SME30 motor is a very low noise DC brushless servo motor - we can either consider it as a great turntable motor or a piece made by the devil!
I have done the same with my Mephisto Stereo months ago and couldn’t believe the difference. i was advised for this from a friend who owns Mephisto monosPeter, ddk, and I have been chatting off and on about this for months. Ddk has clearly done a lot of empirical "research" with materials for his turntable and component rack products. As it turned out, Peter and I both have racks built from high quality birch ply. And very recently, I also inserted a 1" steel plate under my Dart power amp on David's recommendation. It was one of those "can't lose" propositions in that for $100 and a bit of elbow grease, I couldn't see any reason to not give it a go. The principal is fairly simple: to mass load the shelf. Well, earlier this week, Peter and I compared notes. We were both a bit shocked to see that our independent descriptions of the changes we heard were nearly identical. So, I second what Peter has described above. And, I would say the two most immediate observations for me were the added fullness particularly in the upper bass to lower mids, and the added depth in terms of front to back 3D layering.
Now in my case, I bought A36 steel plate instead of stainless to further save on cost, in case it wound up in the landfill. So I primed and painted it with Rust-Oleum to prevent rusting. It turned out well and is very inconspicuous in its final resting place.