In a well implemented CD player the power supplies should be designed to cope with this. As per my measurement links, even audiophool CD players will handle 5x red book error requirements, some 20x.
If the cheese box that the transport is in has been so poorly designed that the transport is shaking itself around, get a better transport!
Maybe I just got lucky or Marantz Engineers did their job properly, or a little too well if you consider 17Kg bloaty for a CD player...
That's what I thought as an obvious understatement that it did not seem to me useful to explain, out of respect for my interlocutors.
Adding inertia to the suspended transport of *MY* CD player just lower the resonance frequency of its suspension, filtering better the vibrations transmitted by the shelf on which it sits to. it means less work to the focus motor of the laser, obviously less reading errors (Autofocus has its limits) , asking less work to its error correction system all along with the well named side effects you pointed.
Simple minds like to look through the little end of the telescope, it's reassuring to believe that one masters everything with formulas. We sleep more deeply on certainties. Though less well with his bad faith.
Last edited:
Think of what would happen if the social interaction was about some less leisurous subject
Or is the ruddiness independent of the environmental stimulus?
George
"As soon as I receive your check."
This said, I'm pretty happy with *my* CD player and its home made analog part.
Give-me evidence that your sound better.
I really like, sir, how you walk in the pedestrian crossings with your hiking military boots.
Last edited:
Hey Bill,
CDs and CDRs play back using entirely different optical phenomena. In a player the focused laser spot is twice the pit width, so 1/2 of it's area will fall in the pit track.
A molded, replicated CD achieves a contrast ratio between the substrate and pits due to the pit depth being ~1/4 λ, so the light entering the pit travels 1/2λ as it re-emerges from the pit to combine with the reflected light from the substrate. Ideally this causes complete cancellation and looks dark to the photodiode array. Between pits the substrate only reflects light so it looks bright.
A CDR uses decomposed dye which merely looks darker than the unexposed dye as a method of achieving contrast.
In both cases, the interaction of the laser spot with any object results in a sinusoidal function of the reflected light. This is due to the round shape of the spot as it crosses the object. The resulting detected pattern looks like a incremental series of flat-topped sinusoids of multiple of length "T" : T3, T4, ...T11, the result is called an eye-pattern.
I tested literally tens of thousands of CDs and CDRs on $2M worth of test gear by AudioDev, CDA and Schenk over a 20 year career in optical disc manufacturing. I can assure you the contrast ratio of a properly manufactured molded, replicated CD is consistently better than almost all CDRs.
CDRs in general have such low signal strength and high jitter that many if not most have E32s. The compatibility of recording media with recorder characteristics is a crapshoot, so we ended up specifying specific CDR blank media models and recorder models to our repeat customers to ensure proper mastering. The rest suffered over 25% master reject rate due to the inability to play the CDR without an E32. The fact that people think CDRs work fine is a testimony to how well error concealment (interpolation) can work.
This was such a pervasive problem in the CD replication industry that we always recommended audio masters be supplied as a DDP (Disc Descriptor Protocol) image on a CD-ROM which has an extra layer of error correction. These masters seldom failed when using compatible media and recorders.
I agree with the others here saying a molded, replicated CD in new condition will usually play without any E32s.
Just my experience,
Howie
My old Denon player plays CDs fine.
If playing CDRs; it will only play them of they are burned at a 4X or slower. Burning a CDR any faster and the player doesn't even see the disk.
Howie
Is this why? The way the CDR is burned vs a CD?
It isn't a problem for me, just curious.
If playing CDRs; it will only play them of they are burned at a 4X or slower. Burning a CDR any faster and the player doesn't even see the disk.
Howie
Is this why? The way the CDR is burned vs a CD?
It isn't a problem for me, just curious.
The most likely culprit is compatibility between the media and recorder resulting in a low quality recovered EFM. If I still worked at the factory I'd offer to test your discs, but I am thankfully done with that chapter, sorry.
There used to be a site which reported CDR/recorder compatibility testing, but I don't know if it is even in existence any more...Hey, aren't optical discs obsolete? lolol
Howie
Be understanding, George. Max's comments were not often commented on with all the kindness that would be appropriate here.
Which does not mean that I would put my own signature on some of them. (Feel obliged to add this !)
Agree with this, and the reason why we continue to buy CDs from time to time, copying them to a safer media.
@T: Actually you go first. Measuring drive current in the CD mech (with no records kept of course) does not immediately infer a sonic improvement.
You haven't even mentioned the CD player you were talking about. I at least mentioned mine so you could look it up and note that a lead slab is likely to have made zero difference. Either way I lost that player a decade ago in the divorce so am sadly unable to take part in eye diagram drag racing. I rarely miss having a CD player in my main system.
@Howie: Thank you for confirming this was likely in the mind of the reviewers. They were saying it was the pregroove that had the sinusoid imposed on it to help the recorder track, but looking on line at some high magnification images I see no immediate evidence of this.
You haven't even mentioned the CD player you were talking about. I at least mentioned mine so you could look it up and note that a lead slab is likely to have made zero difference. Either way I lost that player a decade ago in the divorce so am sadly unable to take part in eye diagram drag racing. I rarely miss having a CD player in my main system.
@Howie: Thank you for confirming this was likely in the mind of the reviewers. They were saying it was the pregroove that had the sinusoid imposed on it to help the recorder track, but looking on line at some high magnification images I see no immediate evidence of this.
I will be thinking of making the next oil supplement of my car under the eye of a camera for the future generations.
It's a pleasure to converse with you, sir. Would-you like an other glass of cherry ?
Last edited:
Camera is no use. You need to do an analysis of the oil and any particles therein. People who maintain serious engines do this. Pleasure Vehicles as Sir Harry Ricardo called them do not warrant such care. The Engines in the trains that take me to London for example had around 7 million miles on them at upgrade. At that life expectancy you check oil very carefully.
"As soon I have received your check." ;-)
This is not the way my mechanic describes mine.
Maybe it's time to move on to a more consistent drink?
Last edited:
Martzloff refers to this as an "upside down" house. The biggest issue is what happens in the event of a near strike or return pulse. The loop formed by the ground and your equipment can totally destroy that isolator and everything connected to that circuit.
The best bet for a user is to have a multiport SPD at the equipment, as well as the isolator. All grounds and shields should be starred at the point of use. That way, a nearby strike will totally destroy the isolator, but with luck, your equipment will survive.
John
ps. Also, if you can, run all low level lines in the same stud bay as the power if at all possible, or even on opposing sides of the studs. I replaced every piece of sheetrock in my house over a 7 year span, so had the luxury of doing that. (as well as insulate, plumbing).
Last edited:
I have explained why I am certain of my findings regarding subjective findings re ferrites.
I have also explained that I am in the process of measuring and analysing subjective changes such as those caused by ferrites.
It is also clear that I am not the only one to express my findings that ferrites can adversely affect subjective sound.
So congratulations you have well implemented power regulation and grounding schemes and your preamp is immune to outside influence such as AC mains quality.
Most of the rest of the world however does not listen to such engineering, that is why I keep stating terms like 'economical' or 'typical' or 'mid-fi' etc.
Next time you go out and listen to some real world systems take some ferrites with you and try them on systems different to your own.
Our ears are well good enough instrument to detect fine tonal changes caused by the likes of ferrites.
Conceptually yes, in reality I find that test signal is critically important and sinewave excitation is essentially useless.
Dan.
Last edited:
It is sad to see that stated. I do not remember the last time I was not fully satisfied with my work. But I guess I am one of the lucky ones, the powers above give me what I need to do what was requested.
However, if you mean to say that you always strive to do better as you are not fully satisfied with results and wish to push further, that is a happy place..
Jn
I did try to measure ferrite clamp on filters to see if they produced high frequency harmonics in a normal application. I thought that might explain the claims of audio equipment problems.
I did not find any case of high frequency harmonics in my test samples, which surprised me as I would have expected some as a result of nonlinear magnetic saturation.
As to burblebees I may post something again on burblebbe day Apri 1st.
I did not find any case of high frequency harmonics in my test samples, which surprised me as I would have expected some as a result of nonlinear magnetic saturation.
As to burblebees I may post something again on burblebbe day Apri 1st.
It is actually an established procedure to analyze the old oil to look for wear. The elemental analysis of the oil can distinguish where the wear is occurring. main bearings, camshaft, pistons. I was quite surprised that they could tell what bearings were actually wearing, I had never considered that different bearings would be made of different alloys.
My father sold synthetic oils back in the late 70's give or take, and he would send his oil out for analysis every year.
jn
The engines I was referrring to cost IIRO £500k each to replace. Compared to 1000 ton plus container ship engines still small beer.
Hi, jneutron,
How to interpret my sentence differently?
We do our best, if we are honest. I simply notice that my bullets always fall between me and the wall of perfection, despite I aim carefully.
I end up believing that this wall takes pleasure in moving backwards while i'm shooting.
Perhaps it is necessary to incriminate the dissatisfaction of some with their hyperopia, and the satisfaction of others with their myopia?
Last edited:
- Status
- Not open for further replies.