bbosler Posted June 5, 2021 Share Posted June 5, 2021 Quote Sources for this system include Roon, Audirvana Studio, and HQPlayer Chris, so related to the last few comments.... how are you implementing the convolution? As I understand it, Roon and HQP do it differently. With Roon you use a zip file that has a stereo file for each of the source rates you use and Roon selects the proper one for the file you are playing. . With HQP you have a mono file for each channel at or above the highest rate you use I don't know about Audirvana. HQP does do convolution and upsampling of DSD, and unlike Roon does not convert DSD to PCM to do it then back to DSD. Again, as I understand it from correspondence I've had with Jussi. I'm sure he could explain it better. see my system at Audiogon https://systems.audiogon.com/systems/768 Link to comment
bbosler Posted June 5, 2021 Share Posted June 5, 2021 2 hours ago, The Computer Audiophile said: HQP accepts a single filter at whatever rate one wants, in my case 352.8 kHz. If I understand your statement you are saying you need to use a filter at the rate you are up-sampling to, which is incorrect. . yes, HQP only accepts a single mono filter for each channel... but according to Jussi, HQP applies convolution at the source rate, not the up-sample rate, so you only need to pick a filter at or above the highest source rate you will be using. I asked him about this when I had a DAVE. I was using HQP to up-sample to 16fs so was concerned that the Audiolense filters could only go up to 384. His response about using a 384 filter was Yes, that is fine. Output rate doesn't matter, convolution is performed at the source rate. Except DSD -> PCM case where it is performed at 1/16th of DSD rate. The other part of that is HQP does not use a single stereo file. If you only have a stereo file you need to use a program like Audacity to split it into L-R mono tracks ted_b 1 see my system at Audiogon https://systems.audiogon.com/systems/768 Link to comment
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