isolation

Bob McC said:
DavidF
Looking at your pictures you seem to be using an unfamiliar definition of the word cone.
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Problem here Bob?


:)



Edit: I am using the term as a generic one.

Do you know of a term which you feel would be more appropriate?
 
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D Louth 77 said:
Hi DavidF ,sorry i could not reply to your posting as my internet crashed earlier today. Glad you like my posting . The positioning of cones is something i discovered for myself about 15 years ago. At that time i had (and still do a Marantz cd94 mk2) which i did a structural mod to it . I replaced the thin metal base plate with a 10 mm thick brushed and laquered aluminum plate ,with all the holes drilled to match the original . I also filled its feet with miliput a modelers clay which goes hard (imagine Arildite as a type of clay which you mix together). It didn't make sense to me why you should build a wonderful heavy die cast box into which all the bits went only to fit a thin light bottom. This improved things but the addition of three German cones placed as i said earlier also lifted the performance . I spent hours moving them back and forward until i thought it was as good as it could be ,and then glued them in place .
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Yes, right.

I am using two machines at the moment....a modded arcam a5 ( coutessy of zansah) and a marantze 63 ki.

Both have responded to a granite slab being fastened to the bottom ( i removed the feet altogther) using blu tak........that modeller s clay sounds interesting thouigh.....do you think its better than blu tak?

I have experimented a bit with masses.......mild steel plate.....granite.....and slate.

Yes, all these materials will ahve their own natural resonant frequency......I use rubber to (minimoise) damp this.

In someways I wa sceptical of using absorbant material feeling that I shouln't be interupting the flow of energy away from the player.....ie I shouild be focussing on DISSIPATING the energy ....the point of the cones +bearings of course.

I have to say I have not come to satisfatory answer on this......suffice to say that the propriorary isolation plinths on the market all seem to use a degree of absorbant material in them.


As you say , mass....and certainly stabilty are (IME) key factors here.

"I replaced the thin metal base plate with a 10 mm thick brushed and laquered aluminum plate "

.....I would think you noticed a BIG difference.....?

exactly what i would have done.





D Louth 77 said:
At the same time a friend who had a Stan Curtis Cambridge Audio CD 3 did the same and i remember him ringing ever so often and not believing what this did for the sound .
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I can well beleive it....


D Louth 77 said:
He ended up using Michell tender feet .

I am sure that Oak cones and RDC cones will work like this too,if you have the time and patience to play around with the positioning . If i had access to a workshop again it would be great ,as there is a lot that could be done . Your Cones with ball bearing inserts look interesting ,but as you say accuracy would be vital as everything must be level .
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Yes very much so.

Not easy atall.



D Louth 77 said:
When i was at art college back in the late eighties and early nineties i was regularly to found making stuff in the work shops to do with audio . Isolation platforms made up of laminations of different materials and types of cones .
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what material did you use?

results?

D Louth 77 said:
I had this plan at the time to make a new case for my Audio Innovations 300 amp but as i was doing silver smithing and jewelery and not product design,i never got round to doing this . Oh for a nice big workshop,bench drills ,lathes etc;again!
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I have a workshop ....but little time to get in it frusratingly....


Regards D Louth[/QUOTE]




thanks DL......I am alwys intersted in ideas of disspitaion ...and damping......absorbtion.....
 
Symposium rollerblocks are the best. Period. They are not cheap. I have them under all of my gear including the turntables and on my Symposium rack. I always thought that expensive racks were a total waste of money. Guess I was wrong.
 
DavidF said:
bl**dy hell!

not a stunt I'd have pulled.....
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I can honestly say I am to a certain extent and through going round in circles with this kind of thing in the past, a bit of a skeptic.I 've just been sitting hearing stuff I'd not heard before.I'm going to remove the glasses but position the dac1 and equivalent distance and keep the digi soundpipe the same length and shape to see if these latter changes are what's responsible...
 
Trying inverting them and filling them with a drop of Clearskin Australian Red as reccomended by Martha - see avatar. Brings warmth and a certain fruitiness to the sound.
 
larkrise said:
Trying inverting them and filling them with a drop of Clearskin Australian Red as reccomended by Martha - see avatar. Brings warmth and a certain fruitiness to the sound.
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If that's what drinking the stuff will do to me I'll pass:D
Martha does bear a striking resemblance to the new mayor of London....:)
 
This is well wierd-I was just thinking what has a large surface area that tapers to a very small one like an inverted cone and thought wineglass..Well it would appear the refinement and improved clarity is down to the wineglasses...which incidentally are quite a bit stronger than you may imagine. See pic. That's 7 paving blocks and an old housebrick.
You'll need someone to help and must use the smaller stubbier type of glasses but try it-I'm astonished TBH.http://www.zerogain.com/forum/attachment.php?attachmentid=1183&stc=1&d=1214946551though as an old skeptic myself, I must qualify it with 'your mileage may vary'
 
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DavidF said:
YOu've gone to some considerable effort here cooky

I trust it was all worth while?



:)
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Just a bit of fun and experimentation-key is to have an open mind. Those bricks on one glass weigh more than the Teac so 3 glasses is a reasonable safety margin.
The base is just a Tesco granite chopping board-I like to work cheap me. Obviously it isn't practical;-) but something is going on-maybe .
 
DavidF said:
is that right?



:)
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Yeah David, I'll move it over to the trade section:D

I would be interested to hear if anyone else has tried it. Maybe they think 'cos it looks mad it's some kind of piss take-it isn't and I've still got them in place.
Cooky
 
DavidF said:
:eek: :eek:



the thought never crossed my mind.
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Sure it didn't.

One thing that has crossed my mind is it isn't the glass that's 'good' but maybe the granite shelf is 'bad' and the glass is going some way to neutralise its effect ...maybe I'll keep it to myself...
 

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