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  1. In terms of actual listening, my conclusions are based amongst other things on comparisons I did years ago on 24/96 material and that same material resampled and noise-shaped dithered down to the red book 16/44.1 CD standard, and then resampled back up to 24/96. (I used high quality sound sources and did the resampling operations using software. I listened with very high quality headphones and reasonable quality speakers.) From what I've read over the years, it seems that I am by no means the only person for whom there is no detectable difference between hi-res formats and 16/44.1 (for music, at ordinary recording and playback levels). There is no mystery in this. We do not have the hearing of gods (infinite hearing), or dogs (ultrasonic hearing). Nor do we have the eyesight of eagles (for acuity,) owls (for night vision), or birds (for colour discrimination involving more than three spectral bands rather than our three relatively limited human primary colour ranges commonly called "red", "green" and "blue").
  2. You do seem to like to argue the point a lot, davewantsmoore! In case it isn't clear to you already, I am interested in differences in sound quality audible to human beings, that are demonstrably audible. That was implicit in my remark. ___________ As for minor differences between different camera models, if you need a new camera you might have the choice of buying a superseded model cheaply, or the current model at a higher price. The current model might have a very small improvement on paper in one of the specifications. If that's all that was involved you'd probably go for the older, cheaper model. Typically though there will be other factors to evaluate, not just one metric that gives a small, not even noticeable, improvement. With MQA you might own a perfectly good DAC to begin with, and are in effect being invited to buy a new DAC just to get MQA functionality. And what would that give you? um........ It can give you relatively unimpaired sound from particular MQA-constrained stereo content. But not audibly superior sound quality to the same stereo content, not constrained by special MQA processing. um... Time will tell whether MQA functionality becomes widespread. It has audiophile market appeal so I can see it being offered by the manufacturer of a product intended for the high-end audiophile market. Similarly we can find high-end AVRs capable of accepting DSD via HDMI. If there is a market, the manufacturers will respond!
  3. Yes, it's been the standard in the recording industry for many years to record at a bit depth greater than 16, and often higher sample rates are used. In my own recordings I use 24 bits so that I don't need to worry too much about the recording level. I can't recall seeing that argument advanced before. I can certainly see the logic to it but I'm not sure the slight differences would actually be audible. I can see that for surround sound recordings. The arguments for stereo recordings I don't find compelling. However these days SACD capable players can be obtained cheaply enough!
  4. In that he appears not to have succeeded. The great hopes that were held for high resolution formats have not materialised. In listening tests, the humble CD has been found to deliver sound that cannot be distinguished, by the human ear, from higher resolution formats. So unfortunately, Mr Stuart's starting point of trying to find a solution to an alleged problem of inherently limited sound quality in a distribution medium, the red book CD, was misguided. If a limitation in sound quality from the humble CD exists, it is in the quality control of the recording and mastering processes. That is what needs to be addressed. And of course in the great majority of classical music recordings by the large recording studios it had been addressed already, without any need for "MQA". Many people could have pointed this out as MQA was being developed. And probably did. But the marketing edge did exist as a reality, and that is what MQA actually delivers, in reality. It, regrettably, does not deliver audibly superior sound. A similar fate befell SACD. It was thought to offer audibly superior sound but formal listening tests were unable to confirm that. In retrospect, we can say that for stereo sound it was an attempted solution to a problem that did not exist. Audiophiles spent hundreds or even thousands of dollars in pursuit of the SACD stereo experience, to no avail. (They may not have realised that at the time.) Had SACD truly offered superior sound for stereo, I'd have a library full of stereo SACD discs. For audiophiles it, or 96kHz/24bit linear PCM, would have displaced the humble CD. That didn't happen. SACD , once the great hope of audiophiles, has quietly receded to a point of near extinction. It was based on a mistaken assumption about the need for extremely frequent sampling of audio waveforms, as if the human ear were an organic apparatus capable of responding to extremely subtle, extremely fast changes in air pressure, like a specialist ultrasonic microphone, or an echo-locating bat! It glorified human hearing. There was just a basic issue: there had been no actual testing of the assumption that the human ear actually needed such frequent sampling. Unfortunately, though, at the end of the day, that is all the methodology delivers, a differentiated product requiring special hardware and processing. That is despite whatever good intentions may have existed at the inception or along the way. ___ I'm sorry if some of my remarks above touch raw nerves. My own disappointment goes back to the time when I purchased DVD-A discs so as to be able to enjoy the 96/24 linear PCM sound that was purportedly so much better than 44.1/16 sound from a CD. I could hear no difference, let alone a big difference, and was crestfallen.
  5. Yes, I don't intend to support MQA. It doesn't strike me as a mere copy protection scheme. It creates a special class of product requiring quite complex mechanisms that go to the heart of the audio itself, actually altering the audio; not simply protecting it. In the heyday of domestic use of audio cassette tapes, tape noise was a problem needing a solution. Various schemes were developed but Dolby schemes became dominant. That solution was useful. It was worth having on technical grounds. It made quite a difference when listening during the quieter parts of a recording. I can't help feeling that MQA at its heart is a marketing ploy, with the goal of market differentiation. If there is real concern about recording quality, then develop an industry code for high quality recording and mastering practice.
  6. Thanks. An audionet manual I've found on the net says: 6.1.1 Mains phase detection The correct polarization of mains is important for reasons of audio clarity and stability. Please connect the mains cord that the hot pin of the wall outlet is connected to the pin of mains input 13 marked 'PHASE' 14 on the back panel of the unit. The ART G2 recognizes the incorrect polarization of the mains plug automatically. Right after switching on the unit from stand-by mode by pressing the power key on the front panel the following message will appear in the display in case the mains polarization is incorrect: ► Attention: ◄ ► Mains phase incorrect ◄ If you read the above message, switch off the unit by pressing the power key. Please wait until the display no longer reads Going to sleep... Now pull the mains plug and re-insert it into the mains socket rotated by 180°. When you switch on the unit again, the warning should not appear now. Important · If the ART G2 issues the mains polarization warning or no warning at all for both positions of the mains plug, check the connection to earth of your mains socket and mains cord. You have to ensure a stable connection to earth for the ART G2 to work correctly! Although the above might not be the manual for the exact Audionet model it seems reasonable to accept that its content about connection of the mains would apply, at least broadly speaking. We seem to have confirmed that the issue is in fact which way around the active and neutral are connected. And referring to the words above from the manual, it seems that in at least some countries the power plug for the ART G2 can be rotated. So in such a case you'd have a 50% chance of getting the error message if you just plugged in blindly! That is not the situation in the United States provided there is an earth pin on the plug for the power socket. And it is not the case in Australia irrespective of whether the power socket plug has an earth pin. (The active and neutral pins have equal and opposite slants away from the vertical.) In Australia, portable radio cassette players when these were common would often get their mains power from black figure 8 cable terminated in a plastic plug. With some models the plug could be fitted in in only one physical orientation; but with other models you could plug in either way. These portable radio-cassettes with optional mains power were double-insulated appliances without any earth connection. If we assume that the CD DVD player power cord was correctly connected to the CD DVD player, and given that there is no apparent swapping of neutral and active inside the power box you bought years ago, based on the photograph of it, then it seems likely that the power connection to the power box, or the power connection from the power box involves a swapping of the blue and brown wires, That would be very poor practice. However it would be unlikely to pose an electrical hazard for equipment designed in Australia, as under Australian regulations the intended neutral side of appliance wiring is treated as "live" and requires the same amount of insulation for a human user as the intended active side of appliance wiring. Sound quality This is a vexed question, with many people on this forum insisting that some form of power filtering is essential for good sound quality; and others saying it makes no difference for their ears! I assume that the Audionet G2 CD/DVD player we are discussing uses a power transformer and is approved for use in Australia. (In some parts of the world it has been the practice to rectify the mains supply directly without use of a transformer.*) I find rather odd these words (from 6.1.1 quoted above): "The correct polarization of mains is important for reasons of audio clarity and stability.". What "stability" issue would be involved? Can anyone offer a technical insight into that? ___________ * Here's an article on dangers of a transformerless power supply: https://hackaday.com/2017/04/04/the-shocking-truth-about-transformerless-power-supplies/
  7. MLXXX

    Mains in Perth - solutions??

    Probably the first thing if voltage is above the regulatory limit for the part of Australia concerned would be to report the matter to the electricity provider. If the equipment can't cope with a mains voltage that is high but within the official permitted variation, then a stepdown transformer could be considered. But audio equipment is normally designed to cope with a pretty wide variation with respect to the older standard of a nominal 240V, and now the new standard of a nominal 230V.
  8. MLXXX

    Mains in Perth - solutions??

    The phase imbalance could perhaps affect three phase air-conditioning plant. Normally domestic hi-fi equipment connects to only one phase at a time. As I recall, the DC injection factor is covered off in the 2015 version of AS 4777.2. As a greater proportion of the inverters connected to the grid have good compliance with the standard, we could expect the DC injection factor to be on the low side. As regards the mains voltage, it will vary, and the question will be whether an enthusiast's audiophile device can cope with the variation. Cheers
  9. Guzzista, a number of us are interested in more detail about the "out-of-phase" message. The LED screen of which device gave the message? Do you have the make and model number of it? _________ Based on the photograph, the circuitry looks pretty basic, with no obvious swapping of active and neutral:-
  10. MLXXX

    Mains in Perth - solutions??

    Yes at this stage I gather it's mainly people in remote localities where there is no grid power available who go down the expensive route of batteries.
  11. MLXXX

    Mains in Perth - solutions??

    I'm not sure why you use the word "worst". What ill effects are you referring to? I note that if an inverter is connected to batteries and is configured as an off-grid unit, then the householder will get 100% inverter power from that circuit. Is there a sound quality problem with that? Should off-grid inverters be avoided?
  12. MLXXX

    Mains in Perth - solutions??

    I am not sure that any difference in the "quality" of the power would necessarily explain the phenomenon. We can feel more relaxed late at night. Perhaps that's all it is. I do know that the second half of a symphony concert I attend at night is usually more pleasing to my ears. But perhaps the orchestra members actually play better in the second half of the program! I don't know. We are in the realm of determining whether the difference in the sound we hear is due to a change in our state of perception, or whether it is due to an actual difference in the sound waves in the air.
  13. MLXXX

    2019 projector releases ?

    Yes, I don't understand why the X9900 picture looks as blurry as it does. The PQ doesn't seem to be representative of that model.
  14. MLXXX

    Mains in Perth - solutions??

    Thanks John for reporting this experience. It's nice to know that a complaint can lead to a supply voltage that is closer to the nominal 230 Volts. As for "others may disagree", I am one of those. I don't experience any noticeable change in audio quality with supply voltage fluctuations. (The equipment I have rectifies the AC to DC, and smooths and regulates the DC.)
  15. MLXXX

    Mains in Perth - solutions??

    That begs the question why the inverters were authorised for use. It is most likely because they were installed at a time when permitted main voltages were higher. In 2015, the relevant Australian standard for solar inverters (AS 4777.2) was tightened up. A modern compliant inverter should throttle back its output when the grid voltage gets too high. In fact owners of solar inverters have been complaining about that very feature! But excessive voltage is an issue in its own right. Excessive voltage might cause premature deterioration of some connected loads (notably incandescent light bulbs). As audiophile devices typically use voltage regulators, there should typically be little if any impact on sound quality -- well the peak output capability of a power amplifier might be increased! So if a householder has connected a voltage measuring device and has found exceptionally high voltage and fears it will cause damage to toasters, washing machines or certain other loads, I could begin to understand that concern. There are simple voltage measuring devices available such as this one: https://www.kogan.com/au/buy/kogan-power-usage-meter/?utm_source=google&utm_medium=product_listing_ads&gclid=EAIaIQobChMI4suXnOiX3wIVliQrCh0FlQb-EAQYAyABEgLh_fD_BwE If the voltage is actually found to be above the regulatory limit, this can be reported to the supply provider, with a view to remedial action being taken. An instance of that is referred to in another thread on the forum at: