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I see now, the 24MHz oscillator is for External Crystal Input of the EP92A3E chip. Also, thank you for the link. It was a good read.

Teardown of Amazon Basics 4K HDMI Extractor. It uses 24MHz clock. While HiFiBerry Digi+ Pro has two clocks – 22.5792MHz and 24.576MHz clocks. 24.000MHz / 48kHz = 500 24.576MHz / 48kHz = 512 I think 512 is easier than 500 to create an accurate cycle by dividing the clock.

For the DACs built into these integrated amplifiers, the output of the TOSLINK was nearly identical to the output of the COAX. (I left the COAX cable unplugged during the test with TOSLINK, just in case.) Thus, the deterioration in THD+N was not due to electrical noise. @amirm , could you check...

Thank you for the suggestion! I hadn't thought of that (grounding / noise). I will test it with TOSLINK this coming weekend.

I was looking for a cheap but high-performance solution for an entry level integrated amplifier. Many entry-level amplifiers these days have a built-in DAC with SPDIF input (COAX and/or Toslink). So, I ordered Amazon Basic Audio Extractor reading this review. I thought Raspberry Pi HDMI output...

Nice review. If you sell the Scaler, I will definitely buy it! Having said that, it would have been nice if the APU's 1kHz/10kHz notch switch were 1kHz/No-notch switch. I do not use 10kHz notch, however, the No-notch option will be useful for various measurements such as J-Test, multi-tone...

Your audio buffer looks nice! Before purchasing Cosmos APU, I made a simple imput buffer using an OP AMP (Analog Devices AD797). I have adopted the noninverting configuration of the OP AMP, and its impedance is enough high for the DAC. However, I could not lower its noise level as Cosmos APU's...

I agree with Ivan that "you don't need that if have no plan to measure distortions, noise, or a dynamic range at finer levels than $30K Audio Precision analyzers do." Of course, Cosmos APU is designed to measure dynamic range and THD+N of cutting edge DACs with high accuracy. But I use it as an...

@VintageFlanker and @staticV3 , I see now. Thanks a lot! I have ordered E1DA Cosmos (Grade B). :)

@VintageFlanker, This is an excellent review. I have been looking for a high-performance ADC. I have one simple question. How did you measure with RCA? Did you use only GND and Hot pins of the XLR connector? Or, used the AUX jack?

Did you mean "the damping of driver motion" by "the swing-out behavior of a speaker"? If so, I do not believe it is a big factor with amplifiers these days and even with the CCA cables. MrPeabody quoted an excellent pager: In short, DAMPING IS NOT AN ISSUE, BUT THERE IS AN ISSUE (another...

AT6158 is the cable with the lowest DCR that I have. But there is one thing to note about the AT6158. It is a thick cable, a wire diameter of 2.5mm (with OFC φ0.12mm x 238 strands). For its diameter, I think 6.8mΩ/m is a high DCR. Because my speaker connector plugs accept up to 2.0mm diameter...

Because a lot of people doubted the results of my cable measurements, I have measured the cables again. I apologize that my initial measurements were not accurate. DCR of the Amazon 16AWG cable was 27.4 milli-ohm/m, not 52 milli-ohm/m. As charleski suggested, I used the 4-Wire Measurement...

Oh, actually, I measured the FR with another speaker which I have not measured its impedance yet. Then, I will measure FR with Revel M105 too in this weekend. My rough hand-calculation says the diff will be about -0.35dB at 1kHz, -0.8dB at 500Hz with 1W power. EDIT: Sorry but I do not have...

Thank you. But, don't you need frequency-impedance chart of my speaker to calculate the differences?

I too am interested in the reason. Pure aluminum does not explain the 4x difference. However, about 20 types of aluminum alloys are commonly used for electric wires. Conductance of some type of alloy is much lower than pure aluminum’s. Calculation of area in the AWG table is also too simple...

I agree with you. Changing listening position is noticeable too. Room Gain is much bigger than FR changes by cables.

Good suggestion. I will try the 4 wire testing on Saturday (as I can use the ADCMT Digital Multimeter only in weekend at a fab lab). I think the fab lab has another set of leads for another Digital Multimeter (Keysight's). A lot of people seem to doubt the results of my cable measurements. I...

I have measured FR with a speaker with two speaker cables. One is 4m of the Amazon Basic's - 0.416 ohm (0.052 ohm x 4m x 2). Another one is 4m of audio-technica's - 0.06 ohm (0.0075 ohm x 4m x 2). The speaker's impedance was 4 ohm (so, NOT Revel M105 which has 8 ohm impedance as I wanted to test...

Yes, I enjoy my speakers. I love them, thank you.