Hi,
I wanted to use the RS130’s upscaling into my Holo Audio May. I have a mix of many sample rates: 44.1, 48, 96, 192 etc…
I set the PCM Resampling rate to 384KHz and very oddly everything is output at this rate, even 44.1. I would expect 44.1 to be upscaled to 352.8KHz as this is an integer multiple
192->=2X
96->384=4X
48->384=8X
44.1->352.8=8X
44.1->384=8.707X
I have never come across a piece of equipment that does non-integer upscaling before - surely this is not correct?
You are correct, SRC in HiFi Rose is fixed. It is not just upscale, it can downscale. Main reason to use it is compatibility with some DACs, for instance Audio Note which cannot above 96 kHz. It is not a quality SRC, it is much better to let DAC do its job and feed it with whatever SR Rose plays out. Generally there is no benefit from upscaling SR before DAC. Every DAC has integrated best solution to make upsampling, depending of the architecture. I can see producers of digital HiFI equipement gives to many options for users who do not understand the purpose of this options. It remainds me on japanese AV receivers from 30 years ago when they added a myriad of reverb effects into user options and lot of users would rutinely destroy any good sound coming out of these devices.
I have a Holo Audio May and have been told that its internal upsampling is not great. I was trying all sorts - but now have settled on Roon Upsampling - which seems to be pretty excellent these days. Can go higher than the RS130.
Its sounding amazing.
Going higher with a sample rate just makes trouble, not benefit. Raising sample rate gives just higher frequency data carrier what means that is harder to digest it thru the cable, harder to process, have higher jitter with no benefit at all.
There are two sorts of DACs generally - sigma delta (or hybrid) which makes upsample natively because it must do it due to architecture and R2R which works best with lower sample rates and does not need upsampling at all.
But doing upsampling prior to enter DAC make no sense, and makes no improvement to the sound. Mostly, if not multiplid oddly (like in Rose), it will do no harm until 4x, but over that it can do problems because this high SR must be transported by the cable.
Simply said, adding zeroes to digital data can not change the content, but it can harm transport.