Fix it yourself, Scott, and buy yourself a new phono cartridge. That is what we have to do, when we don't pack something away properly.
Ok , i get you , just done enuff shows to say no, the room is no suprise , you know your setup months before. The show setup is usually done a few times and tested , the only unknown and its big is the supply , you wont know until you plug in. Again one should have this covered with a good filter ....
Very true. At the recent show I went to there was one outright winner, obvious from the moment I went in the door - you just knew you could put on almost anything, and it would work ...
One distributor had the goods - the right brands, components and understanding, perhaps intuitive, of what was key. They had three adjacent rooms, with a huge mix from various makers - the sound was never less than quite acceptable in any of the rooms, in the many times I revisited them, and certainly was markedly superior to nearly all the other companies' efforts.
Sorry that things don't hang together nicely, Pavel, but that's the nature of what happens when one, or at least me, attempts to to get the best performance out of an audio system. I note a relationship between doing something and a change in the sound, and investigate it in an experimental way until I'm certain that the linkage is solid - I don't require a rock solid, technical explanation to be in place to accept that there is a connection - and the vast majority of what I do is perfectly logical, 'rational', well within the bounds of normal electrical engineering. Static, or whatever else is the culprit, is a peculiar one - I'm just offering up some thoughts on the matter ...
And as an example of who had it wrong, was TAD. The room was packed, full blown demo with company rep's, their own electronics - classic, edgy hifi, very punchy, did all the "correct things" I'm sure - but a few minutes was all I could take, a system that would be impossible to listen to unless you had a "perfect" recording ...
For those who like the recipe approach, this may be of interest: www.dbicorporation.com/esd-art3.pdf.
First off who was watching wrestling when you could have been watching the Thunderbirds and real roller derby?
John,
You want to test for micro-phonic problems with your electronics just bill a box large enough to put your finished design inside and mount a full range bookshelf speaker driving the inside of the box. You'll get all the acoustic energy you could ever want.
For those who have never put on a demonstration at something like the CES or even the old Stereophile shows it is easy to say it is easy to do. First off unless you have big bucks and have choice of rooms and also have access to those rooms long before a show how would you know how the room is going to sound? The power at the CES show in Vegas was something else, I think one years we were working off generators and another off of whatever you could get out of the wall. Not a simple thing to presuppose you have under control. And I can tell you right now my neighbors hated me, the had to deal with real low frequency bleed into their rooms both next to me and below me. What was I supposed to do for them, use a low frequency filter and cut the bass out of my speakers to make my neighbor happy? We had multiple sound absorbing panels in the room but that would never handle the real low frequency content, sorry to everyone else they were out of luck.
And Frank,
If you want to talk about your improvements beyond the wordsmithing you are doing then come out with it and give some real world examples of what you do to improve your sound. Like I changed this wire, or removed this switch or something we can get our minds around instead of I tweak something and it sounds better. Give some real clear examples and perhaps we won't fry you as often and see if we can make sense of what you are always alluding to. And until you can reference something other than a cheap PC speaker you are really preaching in the wrong place, you do need to go over to something like the LinkedIn audiophile group where you will have plenty of people on your side.
John,
You want to test for micro-phonic problems with your electronics just bill a box large enough to put your finished design inside and mount a full range bookshelf speaker driving the inside of the box. You'll get all the acoustic energy you could ever want.
For those who have never put on a demonstration at something like the CES or even the old Stereophile shows it is easy to say it is easy to do. First off unless you have big bucks and have choice of rooms and also have access to those rooms long before a show how would you know how the room is going to sound? The power at the CES show in Vegas was something else, I think one years we were working off generators and another off of whatever you could get out of the wall. Not a simple thing to presuppose you have under control. And I can tell you right now my neighbors hated me, the had to deal with real low frequency bleed into their rooms both next to me and below me. What was I supposed to do for them, use a low frequency filter and cut the bass out of my speakers to make my neighbor happy? We had multiple sound absorbing panels in the room but that would never handle the real low frequency content, sorry to everyone else they were out of luck.
And Frank,
If you want to talk about your improvements beyond the wordsmithing you are doing then come out with it and give some real world examples of what you do to improve your sound. Like I changed this wire, or removed this switch or something we can get our minds around instead of I tweak something and it sounds better. Give some real clear examples and perhaps we won't fry you as often and see if we can make sense of what you are always alluding to. And until you can reference something other than a cheap PC speaker you are really preaching in the wrong place, you do need to go over to something like the LinkedIn audiophile group where you will have plenty of people on your side.
Kindhornman, if you care to look around I did say what I did to the PC speakers, quite explicitly - and I wouldn't do it any differently to a pair of $50,000 speakers, they suffer from exactly the same sort of weaknesses, typically. And sound worse, much worse for it ...
Until people wrap their heads around the concept that the chain is as strong as the weakest link - such an obvious thing to say, isn't it? - and truly take it on board they will never get it. I say make sure every connection is true, and people laugh - so I say, OK, make an audio amplifier where every part is linked to the next using the same quality pressure connection as is typically used to link audio components, and live with that for a year - well, how dumb is that! might be said by many. And there's the problem ...
The point is, that the attitude is what is all important: unless one takes that on board then typically a person fiddling will always miss the mark. You don't correct a few weaknesses, and say, "Huh? Nothing really better that I can hear!" - you say, "Damn! Still haven't found where the key problem area is yet!" ...
Ultimately, one "easy" way is to make the system incredibly robust, totally over-engineer everything, to the last screw, etc. If the sound is very significantly better then you've captured the solution - so then you need to find where the key gains were made: back off in each area, one by one, to nail where the 'issues' were - this is where the "proper" engineering can kick in.
Until people wrap their heads around the concept that the chain is as strong as the weakest link - such an obvious thing to say, isn't it? - and truly take it on board they will never get it. I say make sure every connection is true, and people laugh - so I say, OK, make an audio amplifier where every part is linked to the next using the same quality pressure connection as is typically used to link audio components, and live with that for a year - well, how dumb is that! might be said by many. And there's the problem ...
The point is, that the attitude is what is all important: unless one takes that on board then typically a person fiddling will always miss the mark. You don't correct a few weaknesses, and say, "Huh? Nothing really better that I can hear!" - you say, "Damn! Still haven't found where the key problem area is yet!" ...
Ultimately, one "easy" way is to make the system incredibly robust, totally over-engineer everything, to the last screw, etc. If the sound is very significantly better then you've captured the solution - so then you need to find where the key gains were made: back off in each area, one by one, to nail where the 'issues' were - this is where the "proper" engineering can kick in.
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1. What's your budget for the caps?
2. What value range?
3. Tolerance?
4. Quantity?
5. Polypropylene - yes/no?
6. RoHS - yes/no?
7. NOS - yes/no?
8. Axial construction - yes/no?
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Joachim, one thing struck me in that datasheet:
Approximately 6 nH/cm for the total length of capacitor winding and the leads
Does 'total length of cap winding' mean the length of the foil before it is wound up, the stretched length you think?
So, if we have, roughly, a 3cm dia cap with 20 layers (don't know if that is realistic) then we would have 3 * 20 * 6 = 360 nH inductance (plus the wire)?
Jan
How much vibration will audio in a domestic situation encounter, and what worries me working in areas where vibration testing etc. is the norm why isn't it done if it is suspected it will affect the product, it should be tested on a vibration table. I suspect that unless it is a totally naff design the levels are not that high in a domestic environment.
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