Simple DSD modulator for DSC2

[merlin el mago]

Heard tell those have 4th order HD...

Hey man don't be rude, first the 4th order LPF with the same characteristic source impedance from Amanero followed with a double C core amorphous 1:7 step up tx

 

[merlin el mago]

What does that mean? If you are using the FPGA DSD converter in DSD bypass mode then you still don't like it? If so, what do you think its doing in that case that's different from not having it the circuit?

FPGA DSD converter in DSD bypass mode degrades a lot the sound quality.

Also, one of the things I'm wondering about is if you send a dac DSD then likely your OS would not mess with it. However if you send your dac PCM then your OS just might be doing something to the data. Have you done tests to show that PCM is transmitted to the FPGA dsd converter in bit-perfect form? If not, how do you know the OS is not a problem?

Not saying you're doing something wrong, just asking what you have checked and how you checked it to make sure some of the things OS have been known to do with PCM has been carefully ruled

Amanero is configured to play native DSD till DSD512 files but if I remember well PCM was configured as bypass, I can confirm this because when I send PCM can listen music.

Daphile can play native DSD512 & upsample also to DSD512 if the computer have enough power, also can convert PCM to DSD on the fly, DSD to PCM, etc. Of course Daphile settings was with no DSD output only PCM output so no room for error.....

 

[Markw4]

...what's the best implementation...

What do you want to do, try to work on your existing filter, or else try to find/build a better DSD dac?

Regarding the DSD converter in DSD bypass mode, if you play DSD64 though the FPGA does it sound okay? What if you play DSD128 from HQ player through the FPGA, is it okay? Same for DSD256 from HQ Player? What I'm trying to understand is does your filter work with DSD256 directly out of Amanero? What about if DSD256 from HQ Player passes through the FPGA, is that still okay? Is the problem you hear only when the FPGA is doing the conversion from PCM to DSD?

If we can be sure about that, then the next problem is to see if your computer is outputting bit-perfect PCM. If so, then will have isolated exactly where the problem is.

Thing is we have to go through some steps to be absolutely sure where the problem is. Of course, that's only if you want to keep using your passive filter.

If you want to get a different dac then maybe we don't need to do all that stuff...at least not yet.

...rude...

Not being rude. I was told that amorphous core transformers have been measured with 4th order HD. Is that incorrect?

 

[merlin el mago]

I'm just trying to no degrade the sound quality that I have and outperforms any DAC.

The problem with the Simple DSD modulator for DSC2 is the poor SQ

N. B. I didn't use the step up tx as LPF

 

[Markw4]

Okay, but do you want to troubleshoot to find the problem? If not then what would you like to do next, get a different dac?

 

[merlin el mago]

No change of DAC, I'm happy with the SQ that I have.

 

[Markw4]

The question wasn't about what you don't want to do. The question was about what you do want to do.

So, do you want to troubleshoot?

 

[merlin el mago]

I want the same SQ using Simple DSD modulator for DSC2

 

[merlin el mago]

I guess with new firmware still same poor SQ when using bypass DSD....

 

[Markw4]

What does that mean? Are you guessing? Did you do a test to find out something? If so, what test did you do?

Merlin, it kind of seems like you don't want to do any work? You want someone else to fix your problems for you, is that it?

 

[merlin el mago]

The problem isn't if works well or not, because works perfectly converting PCM to DSD, the really big problem is the poor SQ compared vs I have now.

 

[merlin el mago]

I did my work. I tested all.

 

[Markw4]

Please describe in detail each test you did with version 3 FPGA firmware.

 

[merlin el mago]

I don't know how to do the filters for FPGA, be sure if I know I will do.

 

[merlin el mago]

I always like to learn but I need good teachers.

 

[merlin el mago]

Will be good if each one person can try himself the best filter for his system so this is DIY not?

 

[merlin el mago]

Why can trust your taste if isn't the same like mine....

 

[PJotr25]

FPGA DSD converter in DSD bypass mode degrades a lot the sound quality.

It is clear information for us that there is something wrong, e.g. in implementation (wrong connection, too long etc.) because there is a bypass mode...

These are notes that may help you - if you want..

No bad intentions here...

 

[merlin el mago]

As you can see I'm ready, and you?

 

[merlin el mago]

It is clear information for us that there is something wrong, e.g. in implementation (wrong connection, too long etc.) because there is a bypass mode...

These are notes that may help you - if you want..

No bad intentions here...

Thanks for support, used short cable & good connections following the advice received here.