Jump to content


  • Content Count

  • Joined

  • Last visited


About marce

  • Rank
    Freshman Member

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. -14odB!!! By you're I suppose you mean the many many audio engineers that are and have been... Anything that does not support your belief is wrong... No possibility of it being the other way round. Do you ever read any of the posted links from me and others...
  2. Can you hear better than -140dB into the mix... ... Its like the old adage "analogue cables don't make a difference"... They do, but those differences can be measured, but are not audible, because now we can measure down to silly levels...
  3. Active noise cancellation, a subject I have mentioned before and worth more discussion. My only Caveat with the If device and others is they really need to be in line with the supply: supply-filter-load a series connection, parallel connections can allow noise to bypass the filter, same with the MOVs for transient protection. Any signal given a choice of paths, it will probably take a bit of both! The devices I've had most contact with are from Vicor/Picor, https://www.vitecpower.com/en/applications/mil-cots/ Mainly lower voltages and mainly on things that cant be plugged in, in fact zero ground connection. The highest main supply being 115V. An interesting note on noise. https://product.tdk.com/en/products/emc/emc/power-line/technote/pdf/generaltec_power-line_en.pdf
  4. A good started on noise from Bill Whitlock: https://www.svconline.com/resources/understanding-and-controlling-rf-interference-364849 An interesting article and link worth following: https://www.rane.com/note166.html Some basics again has links: https://www.cherryclough.com/media/file/Miscellaneous/Shield current induced noise is negligible, AES, 23 March 03.pdf So much out there...
  5. Nope, your wrong, its all electronics, with some transducers... As said there is no point me saying anything regarding the subject because there are numerous things you mention that are not going to have a audible effect on the sound and in some cases probably wont even be measurable... Your final words say it, if someones experience and expertise does not agree with your world view then he is a crap designer, an electronic geek... So unless anything I say or reference supports your beliefs it will be dismissed. I recently put up 3 AES presentations on shielding, dissed! one even highlighted as being insulting to audiophile. I questioned the use of Teflon PCB's in DC power supplies as both un-necessary and likely to cause more problems than they would ever solve and got the same response as I got of you; the "what does he know". Even a comment regarding decoupling capacitors got dismissed out of hand... So at the moment I have a cynical attitude to posting anything technical, because instead of leading to sensible discussion it attracts numerous posts (many from some who only seem to crop for these posts) the content being the verbal equivalent of Enoch's hammer. Sorry but domestic audio is not the forefront of electronics. The DAC side and filters is covered in great detail by the likes of Miska, Mansr etc. We do seem to ignore the big problems such as transducers and the room interface. Have fun. Just remember perception is not always the most reliable tool... 😁
  6. Well I was responsible for the PCB's etc. for this AN VIC-5...😁 Worked on quite a bit of pro audio stuff over the years, a bit of commercial a lot of communications... And a wide variety of other stuff far more sensitive than domestic audio... and whatever you believe the lessons learned from other analogue/digital/rf/microwave designs are applicable to domestic audio. That why I think a lot of the presumed issues in domestic audio are forwarded to sell kit, cynical yes, because most if not all the issues are solvable. But unless anything I say supports the general beliefs, it will be dismissed, or pulled up for appealing to authority etc. Of course if you want you could hire me, I'll give you my firms number and you can have me for 60-80 Euros an hour plus expenses...😉
  7. marce

    $12000 equipment

    It's not a work of art though, its a box of electronics... A few PCB's connected by cables. Even with small runs for PCB assembly it's not a complex assembly. The case is assembles so all panels can be machined flat for drilling the required holes etc. I would imagine there's a huge mark up through the supply chain and in high end audio there is always a perceived relationship between cost and sound reproduction with many... So you can't sell it cheap, it would be no good.
  8. So how does this noise have an effect on the resolution?
  9. Again if you can hear it, its an issue...
  10. So its adding noise! That's how you mask detail.
  11. How do you check if high frequency noise doesn't alter the sound how do you check for it? To check for noise needs measurements, a scope at least really. Then you have to determine whether the noise is having an effect on the final analogue output and at what level, again as some noise is way down, you can't perceive it, so again without measurements you have no reference.
  12. Layout is more problematic, and a different discipline, but again a wealth of information out there... Much of it referenced and dissed on here by the usual suspects. You missed PCB design... Layout being a critical factor in the final circuit working as required.
  13. Yet you keep pointing to the big thread on Servers.....
  14. The point being Mansr check is for audible noise... If you can't hear the noise there is NO issue... Which I believe is the whole point of the exercise, reducing possible audible noise....
  • Create New...