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fetischizm last won the day on August 24 2013

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  1. mobile interference is high energy, very high frequency interference and can quite easily reach the amplifier via ground; in fact I will bet that IS how its getting in, or by slots in the chassis itself. RCA has no provision for a separate ground and shield, they are one and the same, so I fail to see how double shielding is going to make any real difference. without building the components from the ground up to be hardened against this sort of thing, anything else is going to be a bit of a bandaid IMO
  2. except that some DACs make it easier to achieve high performance multichannel output than others ...
  3. as I understand it, sounds like its 6.144MHz the 48x variant of DSD128, so its not really that much of a stretch
  4. nice slightly lighter hearted than usual, fairly minimal techno, not quite Detroit. would have liked to have seen him in Melbourne, did anyone get there? 'Sun Harmonics' is a standout
  5. perhaps some sort of transmitter/jamming device, something made for iphone/android that transmits a signal to cancel out the waves; kinda like those Sennheiser noise cancelling headphones
  6. like the OP says; he wants foamed teflon, anyone can get plain teflon. Mr Rogers: you might find it somewhere, but it would be in large quantities and yeah as I said its not very common and you usually only see it as insulation extruded onto wire, not separately. its pretty soft, delicate; thinner tubing like that Chris uses on his CuTF Vcaps can be stripped easily with fingernails, so its not really stable enough to thread stuff through unless its thicker/bigger like the stuff I linked. I cant say for 100% certain, but I dont like your chances of getting small amounts of it anywhere in Au and his is the only stuff i've seen elsewhere.
  7. thought so, but…well, to a screw terminal, out along a length of wire, through a choke and then run that same unsheilded power line back right next to/parallel with the noise you were trying to filter; right next to the secondary. anyway tubes are more your thing, just seems curious.
  8. and? there are numbers of designs that put them inside, but that doesnt change the fact they have higher emissions than toroids. it wasnt my assertion they are best placed at a distance, but that may be the case depending on the design/purpose. whats the go with that distant choke? it is a choke or inductor yes with the red wiring?
  9. given Paul makes very high dollar shunt regulated PSUs I would hope it wouldnt matter what type of transformer he used. if it did they would be pretty **** shunt regs
  10. NNOOOOOOoooooo although you might find some good fodder in the 'Shot by Kern' series on SBS currently. Montreal was a personal favorite Wow indeed
  11. honestly if you cant make a modern well made toroid work well for you in low noise source components, I would suggest you build a better power supply and an DAC/ADC/Line stage/headphone amp with better PSRR. toroids are used here in the LPUHP. SNR is 125.335dB vs 1V; in the FFT the mains and its harmonics are all -130dB/V you are saying this is a problem? its not even an overkill regulator, just a well laid out one. toroids also used here in the 3rd pic onwards, in both the DAC, DAC IV stage and the ADC sections of this rather high end measurement device built as an upgrade the front end of an audio precision system 2 (already fully optioned up)… yes an upgrade to an AP2, because previous measures of this IV stage were bouncing against the noise floor so wheres that horrible noise and/or distortion? toroids can be bad, but well made toroids, perhaps with electrostatic shielding between primary and secondary windings (not used here, but I usually go for this) are now very good. They also have the benefit of allowing you to have your power supply in the same chassis; in many cases I believe 2 box builds are counterproductive, just an excuse for manufacturers to charge more. dont get me wrong, R-Cores can be good also, but I do think their FOTM status and advantages are largely overrated and more about fashion. there are also hybrid R-Core/Toroid units available which look pretty good. pretty excellent IMD performance below, well everything is pretty special really, not a single digital THD at 1khz measure in sight. its a discrete IV with no global feedback on the DAC too.
  12. but who is that supposed to demonstrate to? what revelations are contained in that? it was a marketing opportunity at RMAF, they dont mention any listening tests in the datasheet or application notes. Why do you even need to make this point? nobody has ever said it shouldnt be part of the process, its popular for people to say there are people that would not listen to their design, but I dont know a single person, even the most hardcore objectivist type; that wouldnt! its not a basis for making design decisions though, which seems to be the line given by some. how much you trust your ears is not of any import and does not have any impact on how accurate they are, they, like everyone else's, are not very reliable and are constantly ignoring mountains of the data coming in. even your own ears are not consistent over time either and thus are not a substitute for objective testing; it is only a possible indicator of where to look objectively. I love listening to music, but I prefer enjoying the music to trying to turn it into an objective measurement technique. measurements are a poor substitute for listening, listening is no substitute for measurement. Both are necessary for best results; but if you must ignore one, you'll get better results completely ignoring listening than completely ignoring measurement; which would be impossible for a DAC chip anyway.
  13. I would think that by now we can move towards some more effective shielding, tin is really not going to be that much help in todays RF and EM rich environment. permalloy/mumetal hat? the guys at ZERO should be able to help us out; they have a mumetal option in all of these and will customise to suit, we could get some eyeholes and earholes? but that might let 'them' in
  14. its not a DIY speaker unless its DIYed, not a hard concept really … (its already somewhat borderline if you just have to put it together IMO anyway)
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