RME ADI-2 Pro FS R PEQ with greater than 96khz (DSD!) sample rates.

[pollock0424]

Hi all,
I have been using the RME for headphones and HiFi preamp/DAC. I found out recently that whenever I set the sample rate for the Analog input to anything higher than 96khz(DSDxx) PEQ is disabled (I get a notification about it when toggling the PEQ).

However, the manual says that PEQ is available upto 768khz.

The manual also says that DSD cannot be processed digitally. When I choose higher than 96khz sample rate, it is going automatically into DSD. Do I have to disable that ?

Looking forward to getting this figured out. I like this unit a lot.. I wish that pro fs r had a phono preamp.

 

[formdissolve]

PEQ also doesn't work with DSD mode, so that must be disabled (from what I remember). Page 48 might have more info as well (below). I think I ran into your issue before but I can't fully remember what I did to allow higher rates. Disabling DSD entirely may have done it..

 

[unpluggged]

The question is why the OP tries to use DSD and PEQ on the inputs when they use them for monitoring (listening) only, not for recording. Why not use the output EQ then.

 

[pollock0424]

@formdissolve
I changed the AD Conversion option in Analog Input to PCM and now I can go upto 192khz with DSP.

@unpluggged
PEQ for Analog input is disabled and I don't use it. I use PEQ only for outputs..

What do they mean by PEQ is usable upto 768khz? Do they mean that it applies to only digital inputs and not AD converted signals ?

 

[Scytales]

In section 8.8 "DSP Limitations" of the user manual, RME explains very well that higher sample rates tax the fixed available processing power (ie, the number of multiply and accumulate operations per clock cycle) of the DSP.

For that reason, as the signal sample rate goes higher, more features done in the DSP have to be disabled to stay within the limits of the available processing power.

Perhaps you use or have enable to much other features than the PEQ at the output and that that prevent you from using the PEQ for outputs at sample rate above 96 kHz ?

More specifically, RME states in the user manual that at 192 kHz sample rate and above, equalization can be applied only to 2 channels and only at one of the three following stages: Analog input, Main output 1/2 and Phone output 3/4.

 

[pollock0424]

I have enabled PCM AD Conversion as opposed to DSD and that enabled me to go upto 192khz as mentioned above.. I have also disabled EQ on the input. I have EQ enabled for Phone output 3/4 and the Main output 1/2, I will try disabling one of them and see if I can go further up in SR.

 

[pollock0424]

Quick update,
Once I disabled the EQ for the phones, I was able to set the AD rate to 768khz.

So,
1. Disable DSD in I/O for the AD Conversion.
2. Disable EQ for all other IOs except the one that you want to use..

Then you'll be able to set highest AD Conversion rates.. with EQ enabled.

Edit: I was switching between 192khz and 38xkhz and the latter results in a loss of top end "sparkle". This is weird..