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Shadders

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  1. Hi, Is it possible to copy the MQA code from file to file ? If the code takes at most 2 bits, looks like noise, but includes the authenticating codes, then a blatant copy will succeed ? If MQA is adding high frequency from the 2bits, and no one can hear it, then why would anyone hear the difference between a correct MQA file and forged MQA file ? As long as people see the blue light, they will be convinced it is MQA. Regards, Shadders.
  2. Hi, Is it possible for someone to modify RBCD to add 8 bits, and implement the relevant bit manipulation to light the MQA blue LED, and then sell it at an MQA premium price ? I cannot see how MQA could police it, unless they downloaded files from many of the sites to check ? Also - could people actually hear the difference ?. Who can really hear the last 8bits from a 24bit file ? Will peoples expectation bias mean the blue light convinces them of the difference ? Regards, Shadders.
  3. Hi, Is this the kiss of death for MQA : https://www.bbc.co.uk/news/entertainment-arts-49726068 Amazon launches HD music streaming The technical bit Spotify: MP3, 320kbps Apple Music: AAC, 256kbps Amazon HD: FLAC, 16 bit, 44.1kHz Amazon Ultra HD: FLAC, 24 bit, 192kHz Regards, Shadders.
  4. Hi, It is going to happen - Microsoft have stopped access to the e-books : https://www.bbc.co.uk/news/technology-48829661 Will happen to other services and purchases, such as games etc. I always purchase the CD or DVD/Blu-ray, and have never downloaded. There will always be a glitch, dispute, or cessation of service, affecting the customers. Regards, Shadders.
  5. Hi, Farnell has the same issue - despite the transistor being in the system as i could locate it through narrowing the filter criteria, it could never return the device through a search. I noticed that when i completed a search, then "bing" was in the search URL that flashed up. Maybe the target system has moved across to a Microsoft solution ? Regards, Shadders.
  6. Hi, @The Computer Audiophile , if possible, can you move the relevant posts from #15088 onwards, in this thread to the new one created : Thanks and regards, Shadders.
  7. This is the discussion on whether Red Book CD (RBCD) is all we need fro audio reproduction given that amplifiers may or may not have a lower noise floor.
  8. Hi, Not sure how he calculated - the Rane article states : Required Conditions. In order for the published figure to have any meaning, it must include the measurement bandwidth, including any weighting filters and the reference signal level. Stating that a unit has a “S/N = 90 dB” is meaningless without knowing what the signal level is, and over what bandwidth the noise was measured. For example if one product references S/N to their maximum output level of, say, +20 dBu, and another product has the same stated 90 dB S/N, but their reference level is + 4 dBu, then the second product is, in fact, 16 dB quieter. The 130dB has to be referenced to a specific output level. The ASR review is not clear on what output signal level is being used. Regards, Shadders.
  9. Hi, If we assume 200watts in 8ohms specification for the amplifier (i think it is specified at 100watts), then 200watts is 23dB. The SPL 120dB - 23dB = 97dB sensitivity speaker. Not many speakers in that range. I quoted 86dB as this is more probable. Even a 90dB sensitivity speaker requires 1kW amplifier. Is it not the issue that, the lower sensitive speaker requires the amplifier to provide a greater power, increasing THD and hence the stated 120dB SPL etc. statement is not relevant ??? The issue is also, the 130dB figure measured - what were the parameters for this measurement ? If 1watt into 4ohms is -106dB due to THD, then how is -130dB S/N achieved in the test - what were the parameters ? I think the relevance to MQA here is that the noise floor of CD is sufficient, and high resolution is not needed - since any music will mask any noise artefacts, especially at -106dB noise floor, making -130dB a nice figure, but irrelevant ??. Regards, Shadders.
  10. Hi, i do not know - does ASR measure to 1Watt into 8ohms? for all its S/N ? It is not specified for the Benchmark. The review states : "Wow, assuming you play at peak of 120 dBSPL, your noise floor will be at -10 dBSPL! That is absolute silence." If you play at this level, then THD rises, so not sure -10dB SPL is accurate. The 120dB SPL refers to 34dB power (2.5kWatts) for a 86dB sensitivity speaker. This exceeds the Benchmark capability. The RANE site is good for the explanations - the parameters need to be stated for any S/N figure ; https://www.rane.com/note145.html Stereophile specification list for the Benchmark AHB2 does not list the parameters for the 130dB S/N except that it is A weighted. Regards, Shadders.
  11. Hi, Sandyk can confirm this, but the specification for the SC200 was measured for the completed amplifier - not simulation. The ULD was also the measured performance. If you purchase the kits/PCB, and follow the article instructions, then you will achieve the measured performance. Regards, Shadders.
  12. They do all look old, scruffy, and lardy.
  13. Hi sandyk, Yes, there are many excellent DIY designs, which can be built for the fraction of the price. It is a shame that DIY is not more popular. Regards, Shadders.
  14. Hi, If you buy Bob Cordell's new book, there is an example design in chapter 4, with all required ancillary circuits, which has 125watts in 8ohms, and 1kHz THD is 0.0008%, and 20kHz THD is 0.004%, close to the Benchmark. Although the S/N is 100dB A-weighted. Regards, Shadders.
  15. Hi, The specification is A-weighted, so please correct if wrong, removes noise due to the filter. The ASR review probably does not use A-weighting. Regards, Shadders.
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