Recent content by oal

  1. oal

    E1DA Cosmos ADC

    As IVX answered correctly, the APU cannot be used for general multitone measurements. As stated in Cosmos APU's “Important notes”, https://e1dashz.wixsite.com/index/cosmos-apu there are four things the APU can do. a) measure THD+N at 1kHz or 10kHz with notch, b) measure DR/SNR with +34dB or...
  2. oal

    WiiM Pro Plus Streamer Review

    It appears that the December 21 release 4.8.539349 is now Roon Ready.
  3. oal

    Marantz NR1200 Stereo Receiver Review

    I didn't know this, but in another discussion thread, I learned that the NR1200 has a speaker impedance setting. https://www.audiosciencereview.com/forum/index.php?threads/marantz-nr1200-measurements-discrepancies.45641/#post-1627787 The default is 8 Ohms, but I switched it to 4 Ohms speaker...
  4. oal

    Marantz NR1200 Stereo Receiver Review

    100% agreed. I too do not understand why. Subwoofer pre-outs without a high pass for the main speakers are useless.
  5. oal

    Marantz NR1200 Stereo Receiver Review

    That is understandable. I too do not want to pay for a technology whose effectiveness is not certain. BTW, here is Denon's page on Dirac Live support: https://www.denon.com/en-us/inside-denon/brand-stories/dirac-live.html Not on AVR, but I found John Atkinson's follow-up article on Dynaaudio...
  6. oal

    Marantz NR1200 Stereo Receiver Review

    It’s not Dirac but Yamaha provides the proprietary room correction feature for its AVR and 2.1-ch amplifiers. They claims "Environmental factors play an important role in the sonic signature of a room. The YPAO™ automatic calibration technique has been optimized for the R-N800A to deliver the...
  7. oal

    Marantz NR1200 Stereo Receiver Review

    Thanks for the advice. But I don't use XLR to measure analog amplifiers. Rather I use the 2.5mm 43Vrms AUX for Class-AB amplifiers like NR1200. Here is my measurement method: https://www.openaudiolab.com/measuring-amps/
  8. oal

    Marantz NR1200 Stereo Receiver Review

    You are right, my answer is no. Though NR1200 has volume control for subout, its settings are in the Subwoofer Option menu. Because NR1200 HDMI input supports only 2ch-PCM, there is no way to control subwoofer volume dynamically via HDMI, unfortunately.
  9. oal

    Marantz NR1200 Stereo Receiver Review

    I don't know if I understand your question correctly, but I don't think the NR1200 subwoofer pre-outs are independent of the front channels. I think they basically output same signal as front channels’ but can set low pass filter (40Hz - 250Hz) & can adjust level (+/- 12dB).
  10. oal

    E1DA Cosmos ADC

    Perhaps my too-good-to-be-true results are due to the cheating.
  11. oal

    E1DA Cosmos ADC

    @IVX, Thank you for pointing this out. I used the AW calibration file this time. Is this A-weighted now? I did not know about the the cheat by Cirrus. :oops: and this is DAC 0dBFS. THD+N or real DR is about 118dB.
  12. oal

    E1DA Cosmos ADC

    No specific reason. I just chose one of +20..+26db gains to check the effect. Attached is the measurement of +26.078 gain.
  13. oal

    E1DA Cosmos ADC

    @IVX , To be honest, since I purchased Cosmos Scaler as an input buffer, I overlooked the gain feature that gives Scaler its name. :D I compared DR tests. TOPPING D30Pro 1kHz (actually 999.76Hz as FFT length is 64k) -60dB to ADC. THD+N = -58.2dB, hence DR = 58.2 + 60 = 118.2dB. Next, TOPPING...
  14. oal

    E1DA Cosmos ADC

    I was waiting for the Cosmos Scaler because of the low input impedance of the Cosmos ADC, and while the Cosmos APU solves this issue for 1kHz signal, I wanted to measure IMD, Multitone, etc. I finally got the Scaler and did a quick test. Let me share the results...
Top Bottom