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Old 27th December 2002, 06:26 AM   #31
jcarr is offline jcarr  United States
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Peter: Those are the Cardas binding posts, right? May I suggest that you machine and tap replacement end-caps (the "nut" that you tighten down to secure the spade lugs) out of something non-conductive like Delrin? There is a possibility that you may hear some positive sonic difference, especially if the amplifier won't be asked to pass gobs of current...

regards, jonathan carr
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Old 27th December 2002, 06:34 AM   #32
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Default IN XCESS

Hi,

Yes,too much metal in the signal path degrades the sound.

Think I'm going nuts....
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Old 27th December 2002, 06:47 AM   #33
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Default Reincarted...

Peter, nice work.
What amp did you kill to get those heat-pipe heatsinks ?.

Frank, what do you mean by 'I would fit some damped cones"?.

Eric.
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Old 27th December 2002, 06:51 AM   #34
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Your gainclone Peter is a very very nice amp, congratulations.

Is the copper tube structural or only used as a heatsink conductor?

What size did you managed overall for the case?
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Old 27th December 2002, 07:02 AM   #35
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Hi,

Quote:
'I would fit some damped cones"?.
Compliance,sir,compliance...

Too stiff a cone or spike will not isolate properly.
I can't recommend these under any apparatus that needs a solid point of reference to earth.
Examples are TT and CDP.
You need to isolate and dampen straneous vibes.

LS need a very solid point to ground to work properly,anything springy there will represent a loss of energy,information IMO.

Remember CLS?

See my contributions (eeek!) to the DIY TT thread.

Being my normal PITA,
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Old 27th December 2002, 07:07 AM   #36
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I'll try different nuts. The heat sinks were bought surplus. After seeing what can be done out of them I bought the whole remaining stock (12pcs.). The tube is not structural. The amp's size is 6" x 8".

The whole chassiss rests on 3 spikes. Front plate is attached to acrylic block, the white part (teflon like) is used for supporting the caps (and also for damping) and is attached to the acrylic block and heatsinks.
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Old 27th December 2002, 07:32 AM   #37
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Default Efficiency, Sir, Efficiency...

"Too stiff a cone or spike will not isolate properly.".
Umm, all the cones or spikes I have seen are solid metal, and provide complete coupling - no compliance at all.

"LS need a very solid point to ground to work properly,anything springy there will represent a loss of energy,information IMO."

I have gone counter to this old argument/reasoning, and find the springs to give near perfect isolation.

When under equipment, virtually zero motion is coupled from the supporting shelf, even when the shelf is buzzing like crazy.
When under speakers, very little vibration is transferred to the supporting shelf.
I find this allows bigger and more tunefull bass, friendlier mids, and SPL goes up - energy is not mechanically transferred to the shelf, and all the energy is transduced by the driver/box combination, and virtually none to the shelf.
I am finding that this lossless high compliance mounting method does not cause extra resonances, and reduces natural ones.

"Remember CLS?"
Aaaahh, no. What is that ?.

Eric.
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Old 27th December 2002, 07:45 AM   #38
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Peter


Your latest clone is giving me the creeps. Apart from a nice but wasted chunk of acrylic what are these horror structures on the side? I hope selenium rectifiers, as if they're heatsinks all the vibtration controll efforts are wasted. They do remind of late seventies Sony and ring in most unmusical manner.

cheers

peter
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Old 27th December 2002, 08:22 AM   #39
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Default DAMP AND BE DAMNED

Hi,

You're talking shelf speakies or what?

Nah,man...A speaker,a floorstander I mean,should have a solid reference to ground.

Quote:
Umm, all the cones or spikes I have seen are solid metal, and provide complete coupling - no compliance at all.
Yep,depending on what you use 'em for,O.K.
But...if they're not effective at absorbing energy you're better off with the spring you're using IMO.
Cones with gradual damping do exist and are a good alternative.

Cheers,
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Old 27th December 2002, 08:30 AM   #40
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Default CLS

Hi,

Quote:
"Remember CLS?"
CLS:constrained layer damping.

See above for more info or in a nutshell:

Damping various materials by applying a certain amount of pressure between (or on) them.

Peter Daniel use it (maybe without being aware of the principles involved) with his granite,expanded foam support.

Cheers,
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