DIY TT Wall Mount

[richidoo]

My TT arm is magnetic suspended pivot, which contrary to some reviews of this TT is extremely sensitive to vibrations.

The suspended floor in my listening room is engineered lumber I-beam. The stereo console is positioned along a wall with no foundation below. Footfalls are a problem, even from 40' away, and upstairs. As the B-52s say in Love Shack "The whole house shimmies!" Great album, btw...

My speakers have two 12" woofers each, so there is some resonance between the woofers and the arm pivot.

It needs a wall mount stand to isolate from the vibrations. I will build one instead of buying one because I like to build things and to keep my money.

I was gonna build something fancy with pretty wood and drawers and shelfs, but I ended up with a very simple design.



The brackets are Knape and Vogt 208-WH-500. 19.5" long, 13" tall, 1.2" wide, .25" thick mild steel, powder coated. I have used these many times in mounting countertops and shelfs to walls with lag bolts. They are very solid. Comes in black titanium and white. Lengths 12, 16, 20 and 22". The 20" length gets the TT away from the 4" thick abfusor above it, and enough room to add a sandbox later.


The mounting location on the wall is actually a corner on the exterior periphery of the house. The corner has a vertical beam made of six 2x4"s nailed together, which go from roof to foundation. Two of the three shelf brackets will bolt into this beam. The other bracket will bolt into a wall stud. Lots of studs in this location. The foundation is brick faced cinderblock on concrete footer on virgin Carolina clay. The location is about 4 inches to the right of my stereo console table. I really lucked out!

The platter surface will be about 24" above floor level, or 29" with sandbox. I want it down below the tweeters to minimize front wall reflections.

[richidoo]

There are three brackets because the table has three tiny adjustable spike feet. Each foot will sit on a bracket. This will be a very low compliance setup. I wanted to try that before adding a layer of plywood, or sandbox, or whatever. I think I will need to brace the brackets from below so they don't resonate or move.

I intend to add sandbox directly on top of the shelf brackets, then some Herbies dots on top of that, if it helps. Kinda like BobMs setup.

[richidoo]

With sandbox added

[BobM]

It's going to be very heavy with a sandbox, like 50lbs of sand for a 3" fill.  I'm not sure you need that if the shelf is going to be bolted to a load bearing wall. If it's not load bearing then maybe it will help. A sandbox, in general, will help with small micro-vibrations, and definitely increase your bass response with its added mass loading. It really doesn't do anything for things like foot falls though.

For a less weighty solution that works well try a home made Ginko cloud. Just get a 1"-2" maple butcher block cutting board. Put a bunch of squash balls under it and sit it on your shelf. The squash balls will flatten down quite a bit and it shouldn't roll at all, like it would with racket balls. Very effective for non-suspended turntables where vibrations are an issue.

[rollo]

Looking good professor. Have been using sand boxes for 20 years. I decouple box with Mapleshade Iso Blocks. Very affective. A maple plinth sits inside box resting on sand. They only hassle is leveling the plinth. Once you get it oh my !
     Always wanted to try hanging the box from the clg. using cable.
     Have fun.


charles

[bpape]

I went through this a long long long time ago.  If you suspend it from the ceiling, you don't need as much mass and it's easier to level and much more isolated from the floor as you have to move the entire house to move the ceiling.

Think Hooks, chain, spring, turnbuckle, chain, hook, platform....

Bryan

[BobM]

Charles,

You are in a basement. Your cement foundation floor is bound to be far more stable than your ceiling joists IMO. Just need a mass loaded stable rack spiked to the floor,

[richidoo]

It's going to be very heavy with a sandbox, like 50lbs of sand for a 3" fill.  I'm not sure you need that if the shelf is going to be bolted to a load bearing wall. If it's not load bearing then maybe it will help. A sandbox, in general, will help with small micro-vibrations, and definitely increase your bass response with its added mass loading. It really doesn't do anything for things like foot falls though.

For a less weighty solution that works well try a home made Ginko cloud. Just get a 1"-2" maple butcher block cutting board. Put a bunch of squash balls under it and sit it on your shelf. The squash balls will flatten down quite a bit and it shouldn't roll at all, like it would with racket balls. Very effective for non-suspended turntables where vibrations are an issue.

Yes, it's a load bearing wall Bob. Actually I will be bolting into a 4x8 vertical column inside the wall that goes straight down to the foundation and up 40 feet to the roof. So I'm not worried about footfalls. But if you think the sandbox might further improve the bass then I'll try it. It'll only cost me a bag of sand and a couple hours of assembly.  Thanks for the squash ball trick!

Looking good professor. Have been using sand boxes for 20 years. I decouple box with Mapleshade Iso Blocks. Very affective. A maple plinth sits inside box resting on sand. They only hassle is leveling the plinth. Once you get it oh my !
     Always wanted to try hanging the box from the clg. using cable.

Thanks Charlie! Maple plinth that's a good idea. Combo of sandbox with a compliant shock absorber seems to be a popular solution. That's why I am thinking about Herbie Grungbuster eventually.

I used to sell gigantic pure rubber tubing used to launch RC sailplanes. I still have a box of it in storage, I was thinking the same thing, of hanging the TT with rubber tubing that is stretched so that the spring rate is almost flat. This would allow movement in any direction. Grand Prix audio stands use this concept, and they sound great. But the rubber suspension would need a very hard plinth?

[richidoo]

I went through this a long long long time ago.  If you suspend it from the ceiling, you don't need as much mass and it's easier to level and much more isolated from the floor as you have to move the entire house to move the ceiling.

My kids are upstairs so ceiling is not a quiet anchor point. My daughters footsteps are almost like my mother in laws, which are almost like well, I better not say....

Think Hooks, chain, spring, turnbuckle, chain, hook, platform....

You forgot whips and handcuffs. 

[richidoo]

I found 3 brackets out in the garage holding up a countertop. I'll snag those for the TT and hang the counter top with some 2x4s. I already have some plywood so I should be able to get it up this weekend. twhs

[StereoNut]

I found 3 brackets out in the garage holding up a countertop. I'll snag those for the TT and hang the counter top with some 2x4s. I already have some plywood so I should be able to get it up this weekend. twhs

That should make the wife happy!!!   

[tmazz]

You forgot whips and handcuffs. 

Fifty shades of sound?   

[richidoo]

 

I put the TT up on a piece of plywood, on top of a pair of heavy sand filled speaker stands, probably 100 pounds of sand total. Placed on the floor next to where the bracket will be. Sounds pretty good. But I can still stomp on the floor and hear it, so I'll try the wall mount. But it's good in the meantime.

[Carlman]

What you need is to drill holes though the floor and into the ground, decoupling your system from the house.
That's a true vinyl-phile.
Ha

[rollo]

What you need is to drill holes though the floor and into the ground, decoupling your system from the house.
That's a true vinyl-phile.
Ha

   Nah that's the easy way out. Do a Sony. Oh yes build a solid concrete footing 4ft thick with a concrete pillar 2ftx2ft resting on earth to plinth. The plinth 8" "Ultum" glued to concrete.
   A free standing ultra column support. Oh it cannot touch any part of the structure of the home.
   What I did was get some 75% soild concrete block, positioned four on the floor [ basement slab], stacked three high with rubber floor matting in between each layer of block. The voids are filled with sand.
   The top blocks have tennis balls resting in the sand supporting a solid 2" maple plinth. It works, looks awesome and had a positive affect. Talk about Nervosa, we were nuts but good nuts.


charles
     One could jump up and down all around it with ZERO affect.