I have not used them because they are not truly floating. The sides that hold them in line cause some friction which in my book is not good enough. Since I feel that this would have minor impact on audio quality, I had not actively pursued improvement of such design. So they are just sitting in the original box on the shelf.
Some electronics do alter frequency response, how about active crossovers with different filter characteristics? How about RIAA circuits? Or, instead of that how about differences in noise and distortion (if you can hear any)?
Sometimes we may want a simple answer to the question, on average how much more or less do you prefer (like) DUT 1 vs DUT 2?
The main thing I was trying to get at is to suggest trying it sometime and see what you think. Even for one's own use, it is a way to quantify. Unfortunately, in the social sciences and in medicine we can't measure in as much detail as we can with electronics hardware. Have you ever seen a pain scale? Happy face on one end and a very unhappy face at the other end. It isn't asking if the pain is stabbing, aching, burning, like electric shocks, etc. It only tries to quantify an overall rating. Sometimes that what we have to do when dealing with humans.
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I am not the designer. But different designers just have their own limitations and ideas I guess. I once saw a fully floating turn table platter design on Kickstarter, the concept seemed nice except you want the tone are to float with the platter to keep the tracking relation.
For feet, I think you still want some damping. But the question would be how to design the damping to be quiet as well.
@soong
You are probably thinking of the Maglev turntable.
Youtube - MAG-LEV Audio: World's first levitating turntable (official)
You are probably thinking of the Maglev turntable.
Youtube - MAG-LEV Audio: World's first levitating turntable (official)
I have looked at the comments and updates, seems that although delayed, progress is being made.
It was just questionable how certain specs were going to be maintained, for example:
1. Putting the stylus down on the record adds possibly a gram of weight which makes it unbalanced, to what extend and how does it effect the other balancing forces?
2. Friction of the stylus is not constant although the average may be, how does this effect the turn speed stability?
3. Can the tracks really rotate in a concentric manner with all this complication of dynamic interaction?
....
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I want an amplifier to amplify. Nothing more; nothing less. I realise that not everyone wants this, describing it as 'boring' or 'clinical', so they choose amplifiers which have been 'voiced' or 'designed by ear' (e.g. the one Scott measured).traderbam said:
Yes, only the latter is actually level matching and only the latter is relevant to blind tests. Let us hope that people who claim to do tests with matched levels have used electrical matching, otherwise their results are quite meaningless.Markw4 said:
These are interesting physics questions, but quite irrelevant to audio. However, I hope you enjoy finding the answers.john curl said:
Perhaps not a scam, just selling something which really is expensive to make but quite unnecessarily so because you don't actually need what it provides. Achieving near zero rumble at the expense of severe arm-turntable instability would not seem to be a good engineering tradeoff. It probably works OK after a fashion and it will probably sell to a particular market. It just won't improve the sound.scott wurcer said:
Then why does JBL used trained listeners in blind tests to get their perceptions? Are you saying JBL, and Sean Olive in particular, don't know what they're doing and you do?
Look, if you are trying to measure perceptions and effects due to perceptions, you have to use people as instrumentation. People are fooled by level differences, as you know. If you want to remove the fooling part due to level difference and find out what people would like if they had a volume control in their home or car, then you need a way to quantify what they would like in that case. Take for example the loudness wars with recorded music. Louder always sounds better, and level in that case is referred to 0dB FS. Of course the louder one sounds better even though they are level matched to peak level, except it doesn't. So how to you take out the effective perceptual loudness factor to see what people prefer in it's absence. If you give them a volume control you can measure how much of their liking is due to loudness. Once they set perceptual levels the same, then you can ask them to take another listen and find out what they like and don't like about about the DUTs at that level balance. Also, please understand this is a work in progress. It is experimental and exact methodologies need further development.
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