Home made equipment isolation platforms.......?

Can't quite remember the design Pete put forward after what sounds like a lot of experimentation, only read it once and it vanished

I don't want to cause trouble or start dodgy discussions that get removed, I'm just after inexpensive suggestions that people have found to work for them, any thoughts On Designs appreciated, cheers

 

Did you get the pics, Mark?

AS I say the damping regime was early days; I'm thinking now around combining cones with isolating plinths ,avioding absorbtion entirely and relying on dissipation.

I rigged up soemthng roughly (far too roughly for pcs!) a few days ago......but it did (IMO) give strong resuilts!

TBH, i'm basing my idaes around existing designs for now

eg

http://www.enjoythemusic.com/Magazine/equipment/0800/brightstar.htm

though , sand didn't work for me that well

http://www.cheshireaudio.co.uk/acatalog/Shelves.html

http://www.silentrunningaudio.com/sra_products.htm

http://www.stereotimes.com/acc122702.shtml


I'm not suggesting for minuite you start buying the stuff in the last (or any!) link....but it might give you soem ideas on what you might make?

I wasn't pulling up the same stuff just now as I was a few nights ago......but with out doubt it is there! Google is your friend!

What do you think?


http://myweb.tiscali.co.uk/nuukspot/decdun/


I also find this a uiseful link......the subject can be confusing.....I think its quite well explained in this passage

ie the differences in possible construction mataerials

 

get something from Ikea.
Put kit on it.
If you must mess about with the legs.
forget about it.

 

I think the lad wants to experiment Bob!

 

I would be happy to sell my DIY rack:





Just the blue bit, not the granite shelves (you can use concrete slabs for cheaper) and the superspike feet.

 

Are those part inflated tyres under the shelves, Isaac?

 

yeah, I used them to very good effect when I had glass shelves some time back - basically I had them under each component on the glass shelf and the inner tube was inflated so each component sat about 1cm from the shelf...now I'm using a wooden rack - I don't really need it...

 

Yes David. In combination with significant mass (ie the granite), they seemed to be very effective for CD players. I did not notice any significant change with other components.

The idea behind the rack was mass. The frame is solid steel cross-members, with sand-filled uprights, and each shelf was 30mm thick granite. Populated with 4 shelves it weighed in the region of 120kg. At its height it had either a 29" CRT TV or a 30kg NAD S300 on the top, along with my 14kg CD player, etc. Heavy stuff.

Since my system now comprises of a squeezebox, DAC and monoblok amp behind each speaker, the rack is sat taking up space in the spare room.

 

Isolation

Having read various threadsand information on isolation my own personal throw is that you make a platform shelf as a composite. Making one ip from bonding differing materials which effect different frequencies say timber glass marble and rubber. In petes recent thread on this he seemed to get better results from combinations. Just a theory and total un researched.
Dave

 

IMO most of this different materials for supports stuff is hit and miss depending on the specific components used. I think it's all a bit half arsed to be honest. What makes more sense to me is tunable mechanical suspension in tension not compression. Think SME turntable suspension.

 

A bit of trial and error/suck it and see is inevitable IMO.

Is that another way of saying you think its all b*** ***t?

...another idea worth following up

I think that where i've just come from.

I'm heading towards light and rigid

 

Not at all David. I just think it's not going to work half aswell as a mechanical suspension system of some sort. I'm sure most of the advantages of using different materials for supports with CD players could be bettered by taking the case off and putting sorbothane sheets on the inside of the case.

 

take ti to extremes, aerolam, sorbothane and something massy, maybe granite.

 

Cheers David Interesting links I'm still working my way through them

Quite interesting in that your aproaching from the dissipation method rather than the absorbtion method, would it be, putting it simply, sorbothane absorbing and spike dissipation?

However what about the vibs that may enter the system from say the speakers, are these dissipated on the way up as the component vibs dissipated on the way down? (does that make sence, two way dissipation?)

 

Hmmm I've some door stop thick roof slates in the garden, guess they will have a similar effect, may have to locate them for a test, Cheers.

 

Cheers, Yep I heard the legs are now hollow too, and yep I would need to play with heights.

 

It looks like the shelves are welded in position, I'm in need of a little more flexibility I feel, cheers for the offer though.

Sounds like you've got to the stage I'm heading towards.....some years down the line, for me though ;-)

 

Thats what I was thinking, so its probably down to ones own choice on what materials sound best, affecting the frequencies that one prefers....?

This SME thing, only seen pics, is it like, suspended by special rubber bands, hung from pillars in each corner of the TT base?
Interesting

 

C'on then lets see these rough prototypes, very intreging stuff