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Yes, it was an unbalanced connection, so the input impedance of the Scaler to the DAC was 100k ohms as you pointed out. The output impedance of the Scaler was 10 ohms and the input impedance of the ADC was 1.66k ohms.

I think so. As restorer-john said, many devices are fine with an impedance of 640 ohms. However, some devices are not. The Scaler or other input buffer is required to guarantee measurement results. Let me show you an example. This is a measurement of an ES9023-based I2S DAC that I bought for...

Yes, there were also small differences in my multitone measurements. However, they are not signals but noise floor between the tones (35-40dB smaller than the tones). Are the differences not audible as Matt_Holland and solderdude pointed out? Just like the 5dB difference of distortion in the...

“In fact, it will be shown that loudspeakers are the single most important element in sound reproduction. Electronic devices, analog and digital, are also in signal paths, but it is not difficult to demonstrate that in competently designed products, and effects they may have are small if they...

JohnPM, Thank you for providing such great software. I have been thinking about buying the REW Pro upgrade for a while, but I bought it today. I hope that purchasing the Pro will help as well as donations. OP, Thanks for pushing me over the edge.

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...

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

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...

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

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...

I will try, thank you!

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...

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/

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.

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).

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

@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.

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

@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...

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...