Advice for Schiit on how to improve Magni 3+ power supply

Boners are useful, if occasionally impolite. Chubs are just... shrug.

Quarantine sucks for my sense of humour.

Are you unwilling to send it back because you feel results might be manipulated into making you look bad?

 

I don't feel like losing it in the mail. CA is in a mess at the moment.

 

Bull f'ing shit.

Fedex Ground, UPS Ground? Higher delivery rates than USPS. Now you are being a shit.

 

On a Schiit.

TBH Schiit can do this in 5 minutes without negotiating over postage and waiting. They probably don't care if I do send it back. If they are confident on it they would cvonduct their own tests and post results faster than I drop it in the mail and send it over.

Like I said, they impelemented similar deisgn in other products they produce. They have spares in the warehouse, providing they do manufacture in house. It took him longer arguing with me than getting things setup.

 

We can't do it in 5 minutes, because we don't have the parts. I use zero tantalum caps on our analog boards, for reasons I posted before: https://electronics.stackexchange.c...ntalum-capacitors-safe-for-use-in-new-designs

However, we'd be happy to get you a call tag so we can test it. Just PM me or email [email protected].

 

It says to SBAF that you are the latest to use that threat and either backpedalled from it or actually gone through with it and nothing changed from the status quo. The same ppl will continue to hate, or won't care.

 

What's with the profile pic change?

 

Thought the guy was going to present, albeit very abrasively, something *potentially* (*key word) interesting at first. If not interesting, then maybe an illustration of engineering trade-offs, which most EE students learn about / see starting in college or most tube rollers and hobbiest experience at some point. OK sure.

Unfortunately he just had to go cuckoo nuts 2nd half of thread...

edit: ^^ also yes, what's the profile pic change?

 

I feel the conversation is more interesting if we use the original definition...

muggle (n.1)
"marijuana, a joint," 1926, apparently originally a New Orleans word, of unknown origin.

https://www.etymonline.com/search?q=muggle

 

Jeezus, a lot of shit happened while I was out doing some measurements (mostly KTE Spring2.)

I know this isn't likely to get answered given the current status of the originator, but I have questions about the setup conditions that were used to provide this graph:

Questions:
1. what was in the input level from the signal source in dBu (or Vrms and I can convert)?
2. what was the output level from the Magni 3+ in dBu (or Vrms)?
3. what load was used with the Magni 3+ output?
4. what was the signal source waveform in dBFS?
5. what was the calibration of the recording system; how many Vpp = what dBFS?
6. why was the recorder set to produce 16 bit wavefiles instead of 24 bit?

These are important to know if someone is to replicate the results given.
All I managed to get from the initial data presentation is that a 7 KHz sine was used. Helpful, but insufficient information.

In an attempt to reproduce at least the before modification results to baseline the graph given I did the following:
1. sig gen set for sine, 7 KHz, -10 dBu level
2. Magni 3+ set for max volume which will result an output of approximately -10.8 dBu
3. 300R load
4. signal source from dScope generator
5. calibration of system for analog analyzer input +18 dBu = 0 dBFS
6. not applicable given no recordings used

Bonus points for anyone that figures out why I set the sig gen for 7000.488 rather than 7000.000.

Here are my baseline results:

Compare this data with that given above. Please note that I have taken great care to produce the same y-axis levels and x-axis demarcations to maintain aspect ratio to maintain visual compability. My y-axis is an absolute in dBu. The other graph is relative in generic dB and we don't know much about it until cal levels are provided.
Below 1375 Hz we observe the typical mains noise at -110 dBu and descending as frequency increases.
Above 1375 Hz we observe a picture perfect 7 KHz sine with 2nd harmonic at -115 dBu and 3rd harmonic of -112 dBu .

I am still having trouble seeing where this needs improvement. I'm certainly not observing the many spikes or noise floor depicted in the first graph shown above.

Room for improvement might exist for measurement techniques and reporting of data for the presenter.

 

Just as a disclaimer... I still haven't apologized for running Modi 3 on an LPS that costs 3x the DAC (and yes, I know I read somewhere that this is discouraged!). And my impressions for that one would also be "a hoot" but at least it means I can keep the DAC running with all 3 outputs and not have to have my laptop plugged in all the time to provide power.

Anyways, I digress. Found it pretty interesting that the OP complained about "costs on him" when I was under the impression that his argument revolved around "costs no object" modifications to Magni 3+. Ah well...

Also on that note...

Oh, lordy... now I read this one as a hint to try and throw much larger caps into Magni 3+...

Okay, I guess I can make that an apology for another thread.

 

I have met plenty of PhDs that couldn't design anything that actually worked if their life depended on it. I've also met plenty of PhDs that really knew far more than just how to achieve obtaining a piece of paper that demonstrates you've (hopefully) stopped shitting on the intellectual floor. My deepest respect for those in the latter group.

Don't know where you are in the learning cycle but I've been in R&D for 47+ years and after going through tens of thousands of datasheets I can assure you mistakes are made, marketing wants specs that the components don't actually meet but get fudged somehow, and there are mysterious undocumented gates in audio codecs to enhance apparent SNR which is why the DNR measurement includes a -60 dBFS 1 KHz sine to open those damn gates. Plenty more examples. Never assume.

 

Cee
U
Next
Tuesday

 

I have got to call Bezos man, he has got this whole internet retailing thing all wrong.

 

In these type of information what always gets me shaking my head is that someone can actually bring something positive, productive to a discussion but they just suddenly have a mental meltdown. It's so confusing to me...they could be interesting but they just are mentally and socially incapable of being someone that can contribute to a great good.

These are the moments that i wish i had a deeper understanding of sociology and psychology because i have such a hard time understanding (but at the same time curious) why some people sabotage themselves in such a manner.


One thing is..it's just a shame he couldn't reply to @atomicbob 's questions but he just went, by his own volition, too deep of a dark place and i understand the mods decision.