Waly +1
Ed: Not statistically savvy enough to argue that point, but I feel this falls into the 'more samples required'. Now Linkwitz used the TL072 in his active crossovers. maybe that is the sort of application we should be really be looking at to see if there is an audible difference? It's a biatch to set up as an internet test though.
Ed: Not statistically savvy enough to argue that point, but I feel this falls into the 'more samples required'. Now Linkwitz used the TL072 in his active crossovers. maybe that is the sort of application we should be really be looking at to see if there is an audible difference? It's a biatch to set up as an internet test though.
what is best topology to get>100db CMR with an actual cartridge on the input port?
THx-RNMarsh
Bill,
Yes better controls and far more samples would be required for publication. As it stands, it is interesting. It does not run counter to much perceptual research that it seems many folks are unaware of.
But if one really cared a careful study could determine masking vs distortion performance preferences. However one can choose circuits that have much lower distortion and noise. It is easy to raise impedances to bring up the noise floor to meet the designer's preferences. Of course one could design for lowest noise and distortion, then wonder why that product may not be the choice of actual human listeners.
If designing entirely by instrumentation there is enough data to suggest best noise levels to improve perception. But even in the design stage one does not know the performance of the rest of the audio system.
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For a start a whole new type of cartridge is probably required! Getting more that 90dB CMRR on any interface would appear to be a challenge based on the numbers I have seen in Whitlock papers, so not sure why you want more than 100. Transformers are of course your friend where CMRR must be high!
Now I am currently planning both a balanced MM and balanced MC stage. But my expectations are more peace of mind than any particular audible benefits. Nasty 8 legs everywhere. 🙂
Since I prefer LP's with plenty of both I guess you can try to flog your point I don't really care. I don't really understand what you are talking about, today it's trivial to get the electronic piece of the signal chain down into the ppm level of distortion while the noise level off of a typical mixing console is usually much higher. So please at least provide some concrete examples of what you want to prove, actual sound files so we can understand.
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The doctors and lawyers and sports people are all counted and included in the group of millionaires. You said the billionaire club was too small. So, we have 10+ million millionaires in usa... a much larger group and still degrees and advanced degrees constitute a small percentage of them.
The only place you find consistent financial advantage for having advanced study is in salaried positions.
Its interesting also that in usa we graduate 100,000 PHd for only 16,000 available jobs. The majority of excess PHd's don't go on to make millions/billions. What happens to them? At LLNL they only picked the cream of the top PHd's... top 10% and be #1 in their field of study. About 450 of them. All I worked with and for were PHd's for almost 25 years. Most were great to work with..... unless they came from a country/culture where there was a social hierarchy.
One such PHd was assigned to me for seismic study of our facility and proposed additions and equipment racks etal. When I told the PHd what I needed from him and our time line, he didn't respond. After time went by and no help, my group leader asked me. I told him he hasn't responded to my requests. He went to the man and his boss and came back and told me... did you know he had a PHd? I said, so what. does that mean he doesn't have to work any more? I didnt show him the respect he expected. Soon after he got a talking to, the PHd was over and apologizing profusely to me and started working the assignment. We all have our positions and areas of responsibility and kissing his *** wasn't part of it. He had to check his ego and do what he was hired for. Too many people here and there let their ego get the better of them.
THx-RNMarsh
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American billion is only 1E9 not 1E12.
Nice that you take 1 experience and tar a whole group of people with the same brush.
Nice that you take 1 experience and tar a whole group of people with the same brush.
No it is not one experience... it is one example, for instance. to make a point here.. it isn't money and it isn't the degree. it is - ability and can you get the required job done. Preferably without the ego tripping.
-Richard
-Richard
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What can we get without transformers and with existing cartridges connected. Can you get 90 or more rejection with input connected to a cartridge??
THx-RNMarsh
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The audio system contains more than a bit of electronics.
The original issue was why would designers pick lower gain bandwidth amplifiers in some cases. The answer is that there are other issues that affect pèrceived sound quality. One of these is that a bit of noise improves the perception of sound quality.
This is well documented in both practice and the literature. I take advantage of this in some system designs. You are welcome to try this yourself.
I see no reason to continue to beat a long dead issue.
I am not sure anyone has ever actually tried to measure CMRR with cartridge connected. I can't think how you would other than comparing single ended to balanced input. On paper you should be able to get 80dB with good component matching, maybe a bit more but what that actually converts to in reality I currently do not have a handle on. Despite what Whitlock says about 80dB being the target I am not sure if it matters when your noise floor is set by the source material.
That's an awfully big bus to be throwing everyone that has a Ph.D under. C'mon Richard, the dude would have been obnoxious regardless. I've had to do plumbing lately to get our lab set up. I don't care, whatever needs to be done. (Actually it's nice to do things with your hands every once in a while).
Please find something else to fill that huge chip in your shoulder.
Richard has a right to have a chip on his shoulder. Many here give him a hard time.
My experience was with a Dutch engineer who came over here to California to work with someone in audio. I can't remember who he worked for, but I thought he might be interesting to befriend. This was perhaps 35 years ago or so.
Since he was into direct drive tube amps, I brought him an updated RCA tube handbook that had the latest high current tubes. I gave it to him, thinking that I could easily replace it, but it did not end well. Somewhere along the line, he said that because he had a higher degree (I think it was a Masters) he could not befriend me, as I was not of the same intellectual status. Oh well, but what was really annoying is that I never could find another copy of the RCA tube handbook. And so it goes, and I regret being so generous to him.
My experience was with a Dutch engineer who came over here to California to work with someone in audio. I can't remember who he worked for, but I thought he might be interesting to befriend. This was perhaps 35 years ago or so.
Since he was into direct drive tube amps, I brought him an updated RCA tube handbook that had the latest high current tubes. I gave it to him, thinking that I could easily replace it, but it did not end well. Somewhere along the line, he said that because he had a higher degree (I think it was a Masters) he could not befriend me, as I was not of the same intellectual status. Oh well, but what was really annoying is that I never could find another copy of the RCA tube handbook. And so it goes, and I regret being so generous to him.
Here's about all the tube data you could ever want. http://tubebooks.org/tube_data.htm
Lots of good old books, too.
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So some of you are saying what's with all the money stuff talk... Earlier today I was walking around a guy's garden that's worth $800m, and I got to say money isn't so bad... Damn that place was crazy. Pic. You can't even see either of the two guest houses that are crazy nice, the basketball + pool area, or the house for certain servants. It takes 7 people to maintain the garden alone, who plant 300k plants a year. There are water falls under the house and lots of plants, as the whole thing is floating except a mini quarters and the garage. His yacht isn't so bad either. And the place in Palm Desert is interesting, has glass walls that open up for huge airflow. I believe they have a mere $27m home up for auction they don't use anymore in CDA.
Education, finished High School and quit college to run a news paper in CDA (tiny, he started out small).
Education, finished High School and quit college to run a news paper in CDA (tiny, he started out small).
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The example --if the shoe fits... maybe not you though. Others know who they are. Waly. etal. No chip, just annoyances. I worked with a man off and on for a year in a building next door.... he had no support. I didn't know anything except it was his apparatus/experiment. Later I learned he had a PHd. The most 'normal' person I ever met. he too would get down and dirty and work on things a mech tech normally would do.
Here is an example of a good research engineer with no ego involved. We had who we thought was very good in high energy pulsed power systems design. We were falling behind schedule and so the group leader sent out to look for a replacement or an assistant for this engineer. Everywhere we asked, the same name can up as who is the best in the world to help him. At one point another company told our group leader, you already have at LLNL the best in the world. Lookup.... so and so. Turns out so and so was the man the group leader thought was in over his head. I told this to him and asked how is it he became the world authority in this field. He said it was his priorities. First came his religion, then his family and then his work. A most humble man who was brilliant.
I was ranked number 2 at LLNl out of the best 200 EE and ME project coordinators. A Sr EE technical project coordinator on very large congressional line item projects. Second only to the projects group leader. I had a sizable signature authority and he said he needed a SIM software for use at home... would speed his work. I ordered what he wanted and gave it to him.
So don't take it personally.... unless you are an elitist and ego centric person. in which case I hope you make millions and billions.
-Richard
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When he reported back to me and apologized (to save his job), you know what this guys reason he gave was..... he didn't think, by my looks, that I had any authority. Where he was from... professionals wore suits... like his. I was in blue jeans. And had long hair.
Geez. So many ways people judge and discriminate. Even highly educated people can have blinders on. One of my bosses told me... which has a lot of truth to it....... the more you know about something, the less you know about all other things. Devote all your time to knowing one subject means you haven't spent similar time on other subjects... maybe less than the average person.
So, unless you are talking in your specialty area, I may give less credence to your opinion than lesser specialized persons.
-RNM
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