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About iaval

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  1. You posted a photo without further description, how should I have guessed your intent? Objective answer would be definite, ie. "this is measured at the connector, because ..." and would not require This is exactly the case where a graph of channel separation would be beneficial. Separation is also linked to impedance. If there's an improvement in channel separation at 20kHz, it would be useful to know how much it was improved and what was the tested load.
  2. Okay, but that's not an answer to my question: TRRS sockets that are some good aren't easy to find. Another option would be to permanently attach 4-wire cable. Here's my theory - since the negatives are shorted, then what makes a difference is not the overall cable resistance, but the resistance/capacitance difference between joint negatives and each of the positive.
  3. Usually not without introducing other problems. I'm a bit unclear on this - digital in this context is meant as PCM? The biggest problem with the CD era music IMHO is that dreaded loudness war, and the fact that many artists can't even render lossless track out of their DAWs and therefore supply labels with MP3s.
  4. Why not Windows 9? We have to fill the gap eventually.
  5. Isolating the elements is vital for proper identification and study. If those effects are real, there should be some reliable method of confirmation. Once isolated, then try to figure out what's going on.
  6. Particular distortion will usually show on more than one measurement method. Crossover, for example, is bound to be visible on spectrum and on the waveform. However my point was to exercise the hearing perception more on discerning these effects, the same way as mastering engineers learn to recognize a particular frequency band where a fix might be necessary. This also helps for communication with others - "this speaker is catching resonances around 800Hz", better than "something in the low-mids sounds funny". Next step might be perfect pitch. My point was to exercise this sense, as however imperfect it may seem, it's certainly possible to better it.
  7. A good exercise might be to learn how a particular distortion sounds like (in exaggerated simulated scenario), and use that knowledge to confirm which measurement to use to confirm it.
  8. It's the interpretation of the measurements, not the measurements themselves.
  9. The biggest problem with SQ, at least from my perspective, is that a lot of people are chasing it as the #1 priority, and are willing to sacrifice a lot for it. I don't mean necessarily money. But convenience is a factor too, as well as: power consumption heat dissipation longevity compatibility maintenance required durability weight extra features There's just no compromise with some. I'm more than willing to trade 5 times lower power consumption of TLE2062IP vs JRC4556AD over extra 6dB of noise, worse THD+N into loads below 32Ohm, worse linearity, etc. because 2062IP still gets the job done reasonably well at 4.5mA quiescent over 22mA drained by 4556AD. It's not a compromise I'd hear, therefore a tradeoff over what's very noticeable (battery life) is definitely worth it.
  10. All my home and production PCs are running Windows 7, and it's unlikely to change in near future. By 2020, machines used for internet access will be dualbooted with either Arch Linux or Debian, and maybe my gaming PC would be dualbooted with Win10 along with Win7, but other than that, no plans for migrating to Win10. I have had my share of troubleshooting this excuse for an OS for my clients. Linux is a way to go, but in my case, the transition will take years given the software is not available on the platform
  11. I got it figured out in the end. Turns out I just have to drill out the headphone socket, following instructions in this video: For convenience I drilled one 3.5mm next to the ear for easy access. I plugged in 1/8" jack and immediately noticed 10kOhm load. Great! 1V RMS seems to be correct input voltage. I wonder if I drill one more hole next to it, maybe the system recognize the presence of another socket and switch to balanced mode.
  12. Different question - would sighted listening test with a switchbox be accounted as statistically valid as long as the listener is not aware of which switch position corresponds to which tested gear?
  13. and power consumption ☺️ The issue is not that manufacturers provide incorrect specs, but that their specs is often incomplete. Let's demonstrate it on my recent item of interest - Shanling M0: DAC ESS ES9218P Output power 80mW @ 32Ω Recommended headphone impedance 8 - 300Ω Frequency response 20Hz - 20kHz (-0.5dB) Distortion 0.004% (500mV) SNR 118dB Output impedance 0.16Ω Channels resolution 70dB Dynamic range > 105dB Up to 32bit 384kHz / DSD128 DAC - Okay, but other than to show off, that in itself won't guarantee anything. Even quality DAC will perform poorly in bad PCB layout Output power - listing just 80mW @ 32Ohm is not enough to have an idea how loud it's going to be with any headphone other than 32Ohm. Also missing under what THD+N was that 80mW achieved Recommended headphone impedance - useless (all headphones have different sensitivity, just by impedance it's impossible to draw conclusions) Distortion - we don't know the load and frequency response, good thing they at least mentioned the voltage SNR - 118dB - fine but again bandwidth would be helpful Output impedance - great, finally value we can use Channels resolution - bad translation? Might be crosstalk, in that case, very good. Dynamic range - again, missing bandwidth An example of "good enough" specification sheet would be Fiio X5II: http://www.fiio.net/en/products/41/parameters For that, Fiio gets a thumbs up. They even list the testing conditions.
  14. THD+N, IMD, crosstalk, DR, S/N, crossover distortion, maximum load, output impedance, no-load voltage, load voltage, jitter, filtering, oversampling, frequency response to name a few THD+N (total harmonic distortion + noise) is basically how a pure sine wave is distorted from input to output, this distortion is visible of spectrum as additional harmonic content present along with the initial sine wave, and it's audible as roughness of individual tones, and manifest itself as harshness in percussion. Should be below 0.1% IMD, or intermodulation distortion is usually non issue, but it's basically mixing two different signals together and higher values would yet again show as harshness, especially in treble region. Should be below 0.1% Crosstalk is simply volume difference between channels. Lower values will mix channels together. It's impedance-dependent. Should be at least 50dB Dynamic range is the difference between loudest and quietest signal. At least 100dB for 24bit gear, 90dB as minimum. Signal to noise ratio, pretty much the same as DR, only towards noise. At least 100dB for 24bit gear, 90dB as minimum. Maximum load - minimum impedance allowed for amplifier. Should be 8 Ohm for HP amps and below 2 Ohm for speaker amps. Output impedance - resistance added by the amp towards transducer, should be as low as possible (minimum 1/8 of the impedance of the transducer). Below 2 Ohm for HP amps, below 1 Ohm for speakers. No-load voltage - peak voltage delivered by amp into infinite load. Useful for comparing low output impedance amps among each other. Load voltage - as above, however into known loads (250Ohm, 600Ohm, ...). With this, you can calculate maximum volume for your own set of HP/speakers. Jitter - highly dependent on the topology and nature of the signal Oversampling - how many times is the original sample rate raised to prevent ringing and aliasing errors - usually 128x or 256x Frequency response - which frequencies pass through the said device, at least all audible frequencies 20-20000Hz should be there, with maximum of 0.5dB difference in the baseband Filtering specifies parameters of the low-pass filter to prevent unwanted frequencies entering your signal chain. Mild ones include 24kHz LPF with 6dB/oct roll-off, sharper filters might introduce ringing. LPF is optional. Hope that answers at least part of your question
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