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  1. Don't forget the linear power supply for the ECU.
  2. Can we make it a rule that anyone who opens a thread with a question must identify which answer is acceptable? That way we can all avoid wasting time giving unwanted answers.
  3. No, thank you for your heroic efforts in saving the high-end audio industry from the destructive forces of science and reason.
  4. What's the story behind that?
  5. 10 μs is about 3.4 mm at the speed of sound in air. The slightest misalignment in the placement of speakers and microphone will cause differences of that magnitude. Forget about ears and perception. Unless you're in a lab with some kind of rails for exact positioning, you won't be able to get useful measurements with such precision. If you suspect a skew between the channels in the DAC or other electronics, you should measure the output directly without using a microphone. Then you can easily get nanosecond resolution.
  6. How could you possibly hope to get the positions of the speakers and microphone accurate to 1 mm or so? You need to measure the signal on the wires and see if there's an offset there.
  7. Still anything but clear. Are you measuring something with a microphone at the intended listening position?
  8. I don't see an explanation. Please describe precisely what you are measuring and how.
  9. Where and how are you measuring the delay? With the exception of ancient Sony CD players, every DAC I've checked has had an interchannel delay in the nanoseconds range. Forget about the serial data transmission. It is not relevant to this issue. If you were using a DAC with I2S input, I might suspect an inverted LR clock signal, but you say it happens with many different DACs.
  10. I'll just say that "upgrades" should not be attempted without having some idea of what one hopes to achieve. Otherwise, how will you decide if it worked?
  11. That figure is a bit on the high side for generic cabling. For most audio cables the signal propagation speed is around 200 million m/s. That gives a delay of roughly 5 ns per metre of cable. For typical cable lengths, we're still talking about tens of nanoseconds of delay, of course. Are you seeing a delay between left and right channels? Where in the system have you measured? I'd start by checking if the delay is present already at the output of the DAC.
  12. Why? Better how? Unless your current power lead is getting noticeably warm, there is nothing wrong with it.
  13. You're right. I missed those. Given the age of the device, it's quite possible they have deteriorated.
  14. I doubt you'll get a useful answer out of a sales person. The device, or a similar one, is cheap enough that I'd just get one and see if it helps. There is also a version with a 3.5 mm headphone plug. You can find them on Amazon too, should that be more convenient. I assume you're using a headphone to RCA cable. The easiest is probably to measure at the RCA end of this. Alternatively, the Marantz has a preamp output on the rear panel where you could attach the meter, one probe in the hole and the other touching the metal rim.
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