The £25,000 preamp that went wrong - Tom Evans Mastergroove

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@Scottmoose knows "secrets" -- or at least confidential information -- about the Mark Audio drivers he worked on that are used in the Pearl Acoustic Sibelius loudspeakers. He never seems to reveal that key information. (the NDA probably helps)
Confidential is correct. It's a commercial product, so I'm bound by those commercial requirements (although I get nothing out of it myself). There's nothing mysterious about them -they're 'simply' specified to a desired Fs, suspension compliance, HF response etc., which is done by adjusting the relevant suspension & motor components to achieve the desired results.
 
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@Scottmoose
yikes. that's more than you've ever said before (that I've seen)
you're underpaid
Nothing secretive as far as I'm concerned. I know Harley slightly, but I've no involvement with Pearl, other than having a couple of one-off advisory / consulting meetings a few years ago, and designing a prototype standmount for them some time before that, which was abandoned as it didn't cost much less in production terms than the Sibelius. Because of that, I know what's in Sibelius & being on a small retainer for Markaudio, who are the OEM for the driver, I also happen to know what that is and how it differs from the now-discontinued standard Alpair 10. That's as far as I can go in information terms since these are commercial arrangements between the two companies and like all such arrangements, are confidential.
 
Always got a kick out of Louis’s rants on the subject of “right to repair”- FWIW I agree with him in principle - and I guess anyone should be eligible to their own definition of “audiophile”, but can we agree to disagree with him regarding vinyl - in that while it can never approach the performance of high speed analog tape, for example - it can deliver a sufficiently satisfying simulacrum?
Secondly, am I the only who thinking he’s sounding more and more like Ben Shapiro on meth?
“Gargle my fuzzy tennis balls” indeed. 😉
 
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I'd never heard of mend it Mark before this thread, and I've enjoyed plenty big his videos since, I've recently seen two about his workshop, old and new, I thought he was just mending electronics, but it seems he can mend anything (he's got a decent lathe and a milling machine). I'd love to have him as a neighbor. Him on one side, Allen Milliard on the other.
 
IThanks for that! I was perhaps a bit sloppy to have forgotten that!!!

[But the overall intent of my last post still stands - was this unit a production unit that had been sold - or a pre-production unit in course of development?]

Also - who has bought or even heard Evans's products.
As mentioned earlier, I've heard two of the mastegrooves in systems I'm familiar with, with the same cart as I use, back to back with my own Paradise. Do not doubt the fact that it's a very good phonostage, it is. 25k worth, nah, but as good as a Paradise, yup.
 
Louis does useful things and makes sense, while Shapiro is guilty of neither.
Didn’t mean to imply Louis doesn’t contribute value, just that since the early days of his Mac motherboard repairs, I’ve found his rapid fire speech hard to keep up with. The potty mouth on the other hand is not hard to understand, and almost always well deserved. Those words are in our lexicon for a reason.
 
This thread keeps getting more interesting with the copyright infringement story. For some reason, I keep flashing on the MoFi debacle of 2022 that was first described by a shop owner here in Phoenix:
https://forums.stevehoffman.tv/thre...m-digital-since-a-long-long-time-ago.1150351/
Cost MoFi $25 million eventually. Perhaps it's because both are vinyl stories of people/companies acting badly...
The concept of "right to repair" was buoyed recently by the California law that went into effect on July 1st, 2024, and requires manufacturers to provide parts, tools, and documentation to owners and independent repair shops. This seems obvious to those of us that grew up in the 50s and 60s when audio purchases were a significant luxury and warranty plus support was expected as a matter of course.
 
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Yup.

Yup. That's the reason I put a controller in several of my designs just for that purpose. They could have worked fine without.
If anyone would want to make a ripoff, they should at least have to put in work to redesing the controller software. My controllers will scramble the internal software when a read is attempted. It's standard fare in modern controllers.

Jan
Remember the original IBM PC. The BIOS, which was published, contained a few deliberate bugs, so simple copying would make it hard to claim a clean room re-engineering. Then you would face IBMs lawyers, who were the best in the business.
 
Agree. Instead, Tom chose to give Mark no documentation at all and, if I've read the history correctly, basically dared Mark to repair it. That's a level of arrogance that I have trouble getting my mind around. What was the point? To prove that his expensive phono preamp was unrepairable and therefore a throw-away item? Is that really what you want your customers to think?
 
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