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Everything posted by gwurb

  1. Lol. I am currently doing that. It's not ideal but it's cheaper than Roon.
  2. Don't have Roon. Is that what it shines at? Recommendations?
  3. As an experiment I went through setting up a new tidal account and I chose the artists that I like, etc. I have played the tracks that I enjoy. Watching what Tidal recommends for me I am disappointed. There is almost nothing in the recommendations that I have enjoyed. The reason I setup a new account to test this out is that I was thinking that maybe on my old account I had listened to enough of something that that wasn't my cup of tea and thus I was getting recommendations that weren't all that great. I want to find new music and I was hoping that Tidal algorithms would be
  4. 10mVpp is really low. This has 50mVpp typical: https://au.mouser.com/datasheet/2/687/tpi30a_j_datasheet-1889920.pdf I would be curious what is commercially available at 2A+ . Maybe an LC filter at the output could be a consideration?
  5. I have great memories of listening to tapes on my Walkman. I really enjoy some music on the car radio, then I hear the same song on CD and I am amazed by how much more I enjoy it, and then I later hear it on car radio again and I still enjoy it. I find that it's more about the music then the quality: to a point. There is a limit where something sounds so bad (based on poor quality recording or radio noise, etc) that I would rather turn off the stereo as my ears and brain hurts when something sounds really bad to me These days I tend to prefer digital recordings. But ove
  6. Further information: This is a great slim (4.4 x 10.9 x 0.9 cm) DAP with internal storage, and support for microSD cards. It has digital noise cancelling that can be turned on or off. It has a number of audio enhancements and equalizer settings that can be turned on. It supports audio in: MP3, WMA (Non-DRM), AAC (Non-DRM), HE-AAC, FLAC, ALAC, AIFF, Linear PCM, MP4, WMV 9. It can be used with 3.5mm wired headphones or it can be used as a Bluetooth transmitter. It has excellent battery life. The physical buttons are great, and much nicer to use than a touchscreen. It has FM radi
  7. Further information: BTR5: Portable High Fidelity Bluetooth Amplifier and DAC. BTR5 is a Bluetooth receiver and a USB DAC. It has two DAC chips, 3.5mm unbalanced output, 2.5mm balanced output, and Bluetooth 5.0 . It supports phone calls, and has NFC for pairing. It is certified for Hi-Res audio and Hi-Res wireless audio. It gives you use of Bluetooth aptX, aptX HD, aptX Low Latency, AAC, SBC, and LDAC audio codecs. BTR5 is a small but powerful amplifier that can let you use your wired headphones as wireless, or enable another audio device to be a Bluetooth end poin
  8. I've bought Monoprice cables on Amazon. I like their quality for their price.
  9. Please take this in a positive way; please revisit EM propagation physics as far as reflections go.
  10. You are spot on. The importance is application dependent. The most obvious example where power transfer is not the top priority is headphone amplification. The output impedance tends to be very low, the cable impedance is really low, yet headphones' input impedance is generally at least a magnitude higher (at times multiple magnitudes). So there is no attempts for maximum power transfer. There are other advantages to the headphone amplification system design that sacrifice power transfer.
  11. At all real world wave ranges lol at least when considering classical physics. 'Audio' frequency range doesn't enjoy some sort of exclusive life outside of physical phenomena. How much of an impact mismatched impedances and wave reflections have at various frequency ranges is a separate question...
  12. Matching impedance reduces signal reflections and aims for maximum power transfer. If you can't match impedance then the next best thing is a big differential between lower output impedance of the source, and higher load input impedance. In both of those situations the transmission line length becomes a smaller factor in system, but for slightly different reasons. Edit: When considering impedance matching in this situation it is best to think of source to transmission line interface and then transmission line to load interface. So for maximum power transfer source output imped
  13. The design discussion probably needs to move to the related science topic.
  14. It's a very good way to design a system that the designer subjectively enjoys at the time of adjustment Remove the adjustment for personal preference and it's a way to design a system. I would aim for reference/accuracy of reproduction, or what you may be referring to as reducing errors. Start with a baseline, understand the baseline, build your circuit, understand how your circuit alters the baseline, adjust the circuit to have the least deviation from baseline possible, address the next part of the system, keep going until all parts are finished. Need to keep track
  15. https://www.dpamicrophones.com/mic-university/facts-about-speech-intelligibility There wouldn't be a single frequency or hump relating to voice reproduction 'issues'.
  16. When it comes to speakers that sort of tuning is much easier to do using instrumentation. Any designer that offers products for more than just themselves need to take into account the fact that customers will have a large variance in their hearing. The more the designer favours their personal bias the smaller their customer set. There is also plenty of information on what is generally preferred by people. Its one of the reasons that a lot of headphones have a V shaped frequency response. Its not everyone's cup of tea but its a cup of tea that appeals to many.
  17. https://www.pulseelectronics.com/docs/library/Antenna Basic Concepts 07 12.pdf A piece of electrically conductive material can act as an antenna and indeed pick up RF radiation. That is true for loop, dish, pole, etc antenna types. The above link gives some formulas for antenna size and wavelength relationship calculations. When thinking about XOTs as antennas questions arise in regards to conductivity of the case and thus internal components, and if the wires pick up anything of sufficient signal strength to sufficiently influence audio reproduction. That is if XOTs are wor
  18. There are measurement results that correlate to the subjective qualities that are perceived. I think background knowledge does make a difference to how easily and accurately one interprets results. Some of that interpretation relies on knowing initial things like experimental aim, and knowing the overall experimental structure. Experiments are fairly involved. Skipping details here is a 'rough' summary: 1. Know what the experiment aim is 2. Understand measuring equipment and measurement techniques 3. Setup the experimental procedure to be valid and appropriate for the aim 4
  19. So good! (No smiley face emoji because it could be open to interpretation). The bottom line is that you heard great qualities of your HiFi system and you heard those qualities with and without XOTs plugged in? Is that an accurate summary? It is great that the owner of XOTs is being as generous as they are in providing others an opportunity to test the XOTs. Honestly, it is great! I appreciate the write ups that people have offered of their experiences with XOTs. This includes all of the write ups.
  20. Does anyone own one? Can anyone comment on their experience with it? Also, experiences with this? https://www.vandenhul.com/product/health-ring/ There are audio effects according to description.
  21. Here is a question for everyone: What is this doing? https://www.vandenhul.com/product/the-extender/
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