In the end they had to climb down and Carver won his point. Some say Carver didn't have a good sound then. The Carver clones sound fine and mostly identical if the test is correctly reported, which seemes likely it is . The Cube is very unhappy with fancy cables, It prefers house wire twisted 2.5 times per metre. I am told it got legal at one point. Quad were saying nulling worked ( in a concept a piece of wire ) in the 1960's and maybe before.
Digital nulling is used in aircraft testing. I saw aircraft derived gear of the type the RAF use to test the airframe testing a total hi fi system ( in the time domain as well as amplitude, time being more dramatic ). The error graphs were like the sound I heard. The playback not much like the master when sounding odd as many CD players do. Not rocket science, one step back. The Nordost system is not bad. They haven't a clue of how to use it being the only problem if outside their own tests ( their way, or no way ). They thought we would buy test sets from them. I quickly organised a rejection of that, Richard Black and Tim de Paravachini took less than a minute to give clear reasons why we shouldn't. It's worst flaw being there has to be a very good mathamatical model to know a real null is being tested ( if an aicraft it will be, hi fi ? ). I was asked to leave this test as I understood how it works. I was asking too many questions. I notice it never was allowed to come to life as a test set ( we have AP at work, I have something home brew based on a Rosen circuit using MC33079/5534 that seldom is very different up to 16 bit, I know it's errors and just subtract them on paper, it is about 20 db better than 16 bit. Even my simple one is OK for general testing, link given ).
http://www.nordost.com/downloads/NewApproachesToAudioMeasurement.pdf
The Carver Challenge Page 4 | Stereophile.com
Originally in the Audio Cookbook as Rosen inspired SVF. See also Op amp with it's head in the clouds in the next chapter if you can get the book.
ESP - Sinewaves
Digital nulling is used in aircraft testing. I saw aircraft derived gear of the type the RAF use to test the airframe testing a total hi fi system ( in the time domain as well as amplitude, time being more dramatic ). The error graphs were like the sound I heard. The playback not much like the master when sounding odd as many CD players do. Not rocket science, one step back. The Nordost system is not bad. They haven't a clue of how to use it being the only problem if outside their own tests ( their way, or no way ). They thought we would buy test sets from them. I quickly organised a rejection of that, Richard Black and Tim de Paravachini took less than a minute to give clear reasons why we shouldn't. It's worst flaw being there has to be a very good mathamatical model to know a real null is being tested ( if an aicraft it will be, hi fi ? ). I was asked to leave this test as I understood how it works. I was asking too many questions. I notice it never was allowed to come to life as a test set ( we have AP at work, I have something home brew based on a Rosen circuit using MC33079/5534 that seldom is very different up to 16 bit, I know it's errors and just subtract them on paper, it is about 20 db better than 16 bit. Even my simple one is OK for general testing, link given ).
http://www.nordost.com/downloads/NewApproachesToAudioMeasurement.pdf
The Carver Challenge Page 4 | Stereophile.com
Originally in the Audio Cookbook as Rosen inspired SVF. See also Op amp with it's head in the clouds in the next chapter if you can get the book.
ESP - Sinewaves
I see it a bit differently
- People can't stick to the topic
- There was a topic?
- Opinion is more fun than research
- Research is ignored
- Agendas are hidden
- Articles are written and published
Pano. Most things in hi fi are down to correct measurement. If not it is strength of opinion. The problem is measurements are not easy and seldom done correctly. LP's are not some little cute branchline. They are the exact debate. DIY Audio is the last outpost of people who claim to measure and listen. I have AP I can use. Most do not.
For sure, AP ownership is the kind of argument from authority not affordable to just any next door audio diyer ...
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This is a big version of the Garrard 501 PSU. An AP not really needed. My notes to myself and not really for this forum. This includes the load and is transformer coupled. Buig Hitachi clone. Load which is - 52 dB itself.
I am the proud owner of a Garrard 401, a Thorens TD124, a few Lenco pieces of scrap iron, a Braun PS500, a Technics SL1200 ( not for sale, sorry...😛), etc...so that i have a some good idea of how bad vinyl sucks...
I agree that in my case the 'sycho is probably the main driver. The freudian aspect of things matters a lot in audio, i am absolutely convinced.
But this is also valid for AP totems, or objectivist's tabus...😀
I agree that in my case the 'sycho is probably the main driver. The freudian aspect of things matters a lot in audio, i am absolutely convinced.
But this is also valid for AP totems, or objectivist's tabus...😀
Wow ( no pun intended ). That's my top decks. We at Loricraft love the Lenco. AP is not Loricraft it's the company I also work for who lends me back to Loricraft. The Braun is a nice thing. I have just been invited to the Munich show so say hello those who can. L'art du Son and Loricraft. I am building a lower cost PSU for Lenco. I still think it will be too expensive for most. My namesake at Lenco heaven seems to have a good one.The BBC and Garrard had these PSU's to see what could be done. My Loricraft PSU is the TD125 ( not 124 which I love ) and Hitachi MOS FET amp combined. I built my mistake of how I thought TD125 worked and it was a good idea. The Hitachi is tough enough to work for years. The TD125 is more advanced yet not able to show it. The circuit is primitive so would need work if wanting to clone it.
I researched a AP like device with 127 db dynamic range for $329 ( sorry I forgot the name ). It will do everything I need. Even my primitive test set will go to - 135 db if I don't want all displayed in one graph. Even a soundcard with Freeware will mostly do it. Some cheap 24 bit DAC's are not bad. A clean PSU seems a good idea rather thatn switch mode in the computer. Not expensive to do. I have eithernet via main internet. It has to be switched off when testing to get the last 6 dB without errors. I now solder my BNC cables to the test sample. That makes a big difference.
http://www.janascard.cz/PDF/An ultra low distortion oscillator with THD below -140 dB.pdf
I researched a AP like device with 127 db dynamic range for $329 ( sorry I forgot the name ). It will do everything I need. Even my primitive test set will go to - 135 db if I don't want all displayed in one graph. Even a soundcard with Freeware will mostly do it. Some cheap 24 bit DAC's are not bad. A clean PSU seems a good idea rather thatn switch mode in the computer. Not expensive to do. I have eithernet via main internet. It has to be switched off when testing to get the last 6 dB without errors. I now solder my BNC cables to the test sample. That makes a big difference.
http://www.janascard.cz/PDF/An ultra low distortion oscillator with THD below -140 dB.pdf
I can indeed.
All the Soundcraft Powerstation powered mixers
(plus of course more Soundcraft mixing consoles than I can even remember)
Cambridge Audio 340A
Cambridge Audio 840A
Cambridge Audio 840E
Cambridge Audio 840W
All the post-AudioLab TAG-McLaren power amplifiers.
Recent designs have all been on a consultancy basis, and you will appreciate that I have to keep quiet about those.
Some of the names would probably surprise you.
Please do, and I would be glad to hear your comments.
I might start a thread to discuss it.
I think this is the first time I have heard that removing crossover distortion from an amplifier might be a bad thing.
Ok, that's fine. I use a RME soundcard, but mainly for loudspeakers measurements though i have also used it for very basic (sanity check) measurements on electronics too.
Btw, can you recommend an LP to make similar measurements of the frequency response of a turntable? I find adjusting a cartridge, tonearm, etc trusting my ears...a little bit outdated, and messy, but have only found records to make subjective assessments based on some pieces of music, the typical "audiophile test disc", but no measurements.
Yes sure, no problem, simply professionnals and hobbysts have different priorities/interests. 😎
I will be given some tools for speakers soon when my friend upgrades. We still find the room is a big effect. Each time the mic is slightly moved a different picture.
My friend Martina Schoener had a calibration disk made with some help from Tim de Paravacini. I wonder if it worked? The fact I heard nothing suggests it was too difficult or more likely costly. I have an Ortofon MC25 calibration that would be good to use. It was a gift of the boss of Ortofon Germany who almost certainly has passed on as he was in his 80's in 2000. I think he said it was at the end of it's test life and would not be sold. It is a cheaper type, but to my ears very accurate. Never fool yourself, we care to do the best we can and make each one item the same. No one can say what will be most prefered. One can try to make them identical as best we might. That's the least we can do. Test gear is for that and that is what we understand it is best used for.
Ok, it is so disappointing...🙁
The only interesting reading i found about these issues is an old paper by Morgan Jones in Electronics World, busting ultrasonic resonances into a click taken from Beethoven 9nth as a dirac impulse...😀
The rest are fairy tales told by magic protractors / VTA adjustment gurus...😡
The only interesting reading i found about these issues is an old paper by Morgan Jones in Electronics World, busting ultrasonic resonances into a click taken from Beethoven 9nth as a dirac impulse...😀
The rest are fairy tales told by magic protractors / VTA adjustment gurus...😡
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Along with our Mr S a genius Mr Jones. CCS for valves I find so useful. A BBC man I think? Valve Wizard also a good source ( no BS and good advice ). I have not a great interest in valves, but do get to do circuits. I like and use pre-distortion. It is highly relliable if done with a little thought. Pentode in , triode out ( 82 % triode UL I love ). East-West Ultra linear I call it. I use 20 % full power on the pentode to get relaible results. The g2 at 115 V and HT at 320 V typical. Sorry I sold that design so must not go further.
Valve or not valve, the problem remains the same: why do you need for a .1db riaa accuracy if you don't even know the rest of the equation...😕
That's why vinyl world enerves me somewhat, i confess..🙄
That's why vinyl world enerves me somewhat, i confess..🙄
" The rest are fairy tales told by magic protractors gurus..."
Bloody well said. I never met Percy Wilson. His 1928 design is the one I used as made by Mayware. I go past his house and Michael Gerzon's when going to the cinema ( Walton St Oxford via Plantation Road ). It's hard to think they didn't meet, they must have. I find no mention in texts. It is two minutes at an 80 year olds pace. Michael could have been so good on this forum. He would have been a friend if I had made the effort. He needed a bath!
Bloody well said. I never met Percy Wilson. His 1928 design is the one I used as made by Mayware. I go past his house and Michael Gerzon's when going to the cinema ( Walton St Oxford via Plantation Road ). It's hard to think they didn't meet, they must have. I find no mention in texts. It is two minutes at an 80 year olds pace. Michael could have been so good on this forum. He would have been a friend if I had made the effort. He needed a bath!
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