Plinth Plans Please

Wntrmute2

Junior Member
#1
I'm looking to have a plinth for a Thornes TD-124 done out of a 3 inch granite surface plate. Anyone have CAD plans or detailed drawings? I found one set, I thought, but they didn't seem to materialize. The water-jet cutter needs these to perform their magic Any other thoughts? I am trying to reach Jim over at AK to see what he might have in the way of slate plinths as well.
TIA
Dave
 

Redboy

Knobophobe
#2
Unless your water-jet guy has worked with slate before, it could be a costly learning experience. Apparently the surface is prone to chipping out if it's not done properly. I'd tell you more, but that's about the extent of my (obviously limited) knowledge of this.

Soapstone is another stone to consider, if you're set on stone.
 

je2a3

Junior Member
#5
Just want to share the experience of a friend who tried granite with his G401, after hearing another 401 on a laminated plywood plinth, he ditched the granite. YMMV.
 

BruceK

Junior Member
#7
I tried granite and slate under my Well Tempered (original model, sq motor) and in my experience the slate was much deader, whereas the granite felt more prone to ringing even though it was very heavy. Mind you, not a 3" piece, it was maybe 1.25" thick.
 

fiddlefye

Senior Member
#10
I've zero experience with granite, but I've heard it rings pretty nicely. On the other hand I'd guess that if it were well constrained from above and below it might work just fine - but would spoil the visual effect.
 

Wntrmute2

Junior Member
#11
I've zero experience with granite, but I've heard it rings pretty nicely. On the other hand I'd guess that if it were well constrained from above and below it might work just fine - but would spoil the visual effect.
I hear what you are getting at. I look at it as what does it take to excite a 200 pound block of anything to ring? If there is a vibration that is going to do that, then what is it doing to the speaker cabs, tonearm, cartridge etc? The plinth would be sitting on a machinist's stand with adjustment under each corner. The stand sits on a linoleum covered basement slab. I am fully aware that I'm probably wrong but I won't know until I try it. The granite plate works nicely under two different VPI TTs.
 
#12
I hear what you are getting at. I look at it as what does it take to excite a 200 pound block of anything to ring? If there is a vibration that is going to do that, then what is it doing to the speaker cabs, tonearm, cartridge etc? The plinth would be sitting on a machinist's stand with adjustment under each corner. The stand sits on a linoleum covered basement slab. I am fully aware that I'm probably wrong but I won't know until I try it. The granite plate works nicely under two different VPI TTs.
You're correct, of course... but sound waves from your speakers will vibrate/excite their environs far more than most of us realize. On that topic, this article is fun and fascinating to me... and it highlights the extreme measures of one whackadoodle audiophile -- check out the cinderblock listening room!
 

Kyle

Junior Member
#14
The Plinthmeisters tell me granite is ringy.
Slate is better suited (or so I am told) than granite.

Another popular material, at least with the local gurus, is this stuff called Paperstone.
Paperstone would be an excellent material for a plinth. It's one on the least resonant materials I've seen in person. Super rigid, you can use a woodworking router on it (with cutters that will last for about 50 linear feet) and you can get it a wide variety of colours and appearances.
 
Top