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I had noted a high frequency ripple on the MAJ745 speaker input terminals when making some meaurements in the past. I used an HP 34401A 6 1/2 digit multimeter. The frequency was 42.217KHz and the ripple was 17.33mvAC. This is obviously the switching frequency of the bias supply. What I don’t understand is how bias voltage ripple would affect the diaphragm as it is resonant at 22KHz and the response drops off like a rock above that. I suspect that a current probe was used to measure the bias current as measuring 15kv directly is quite risky. I would be interested to know is exactly how the measurements were made.
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The concept is interesting. But there are more questions than answers. How about providing more information? Such as:
What does it look like (a picture would be nice)?
How is it connected?
What SoundLabs aren’t applicable?
And the big question: What’s its price?-
With respect to Christopher Stubbs comments: I would think this improvement/modification would be welcome with open arms. This is League Changing. Until you listen with your own ears you are not making intellegent comments stating “The power of suggestion, especially in the field of audio components, is remarkably high”. I must point out the math error stated above. It is true the bias voltage is around 15KV. The area of distortion and coloration occurs between the Stators and the AC Ripple. The stators swing around 100 Volts AC. The ripple is 30 to 50 volts depending on the vintage. 30/100 is absolutely enouch to have an effect on what you hear. I measures this. The attached images display my findings. Constant improvement is a way of life. It is OK to make improvements especially in the High End Audio world. I am offering an opportunity for any Soundlab owner to try this modification, listen with your own ears, then present your opinion.
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Hello Mike,
I am hovering around $700 to $999 for a pair of LCM-X2. I recently gave a pair to Jay (see his comments) as my first introduction. This mod is far more amazing than replacing any pre-amp, power wmp , wires… as the colorations and distortions occur after the speaker inputs – internal. This is very interesting, especially from a molecular point of view. I am not saying the speakers sound inferior, only saying that this modification elevates the SL to an unimaginable sonic level.This is Plug and Play with the addition of a ground wire. Kind of like Magic if you are unfamiliar with electromagnetic forces.
I am looking for a second SL Owner to install this modification no charge. Here are a few more images.
Feel free to reach out and contact me, and again this is an improvement to an already great speaker…
and the pictures of the bird are a sound engineers impression of the sonioc difference.
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Just posting this here (I posted on FB just a moment ago). There will be no follow up in the forum. Thanks.
After some hesitation, I feel a few comments are warranted in response to Mr. Merendino’s recent posts regarding his claim that SL have severe distortion and coloration. As most may probably already know, Sound Lab is a very small company making only a handful of speakers every year. There is no concern from our side that the comments will damage our mostly non-existent marketing efforts. Those who come to find and appreciate the solutions that Sound Lab provides tend to be life long and very loyal supporting customers and they are the customers who we wish to serve. Anything created from Sound Lab is a labor of love and born from a single persistent drive to make as uncompromising a full range electrostat as possible…nobody at Sound Lab is living any luxurious life of commercial success. Therefore these notes are to support those who may never have had the chance to audition Sound Lab speakers and it would be, in our opinion, unfortunate to slam the door shut on any potential new interest because of claims of ‘distortion and coloration’.
Some simple comments: Everyone who knows Dr West (feel free to ask) knows that he has only one goal in mind which is to design, build and improve electrostatic design. For over 50 years with extensive education and scientific research in electrical engineering and a phd in psychoacoustics and practical application spanning for several decades.
If there is something that could be implemented that Roger believed would improve the performance you can bet that he would be very interested.
Did Mr. Merendino approach Roger with his ‘findings’ several months ago? – yes he did. Did Roger have any interest after seeing the graphs and claims from Mr. Merendino?, no he did not. Are there reasons for this? – yes there are but I do not believe this is the platform to explain some of those details.
One small note (as another educated group member has also noted earlier) – the ripple effect is known and is an unavoidable result of a bias power supply. This is not ‘news’. And I am not an engineer at all, but I have listened very carefully to Roger. The bias ripple measures at approximately 30 volts. It is present independent of any audio signal and does not combine with any audio signal. It is present, in other words, when you plug in the AC and apply the bias charge – see if you can hear anything. Roger is confident that the power supplies which he has designed exhibit very acceptable ripple effect (very low and inaudible) The bias on the membrane is in the order of around 15,000 volts. A little simple maths will calculate what a minuscule percentage this is (30 / 15,000). If that is not enough, even more important is to note the ripple frequency is upwards of 40,000hz … more than double of what the human ear can hear.We hope this clears up any questions of Sound Lab’s position. The power of suggestion, especially in the field of audio components, is remarkably high. We hope that all might consider the costs and to evaluate carefully, to trust your own ears, and hopefully to make more time to enjoy the music.
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Hello, I have an improvement for most Soundlab Electrostatic Speakers produced to date. Excessive ripple voltage on the diaphragm interacts with the plate voltages distortion. This can be identified as dissonance, and an overall fuzziness around all the voices and instruments.
I manufacture a Plug and Play modification that minimizes these effects. The overall focus and clarity is greatly improved. It is a League Changing Modification, hence the product name LCM-X2
I have attached some images to help identify this phenomenon.
Please contact me for more information. The company’s name is Hear Ye LLC.
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