Upsampling, Can there be too much?

Upsampling adds nothing but distortions.

Well, I wouldn’t go this far either. There are measurable and IMHO audible differences in how the frequency response changes with most DACs as the sampling frequency is increased to 88 kHz and above. Frequency response measurements are perhaps the thing listeners are most sensitive to. For this reason I have my Roon set to upsample below 88kHz and otherwise give me the original signal above that.

The biggest difference I’ve ever heard though is with how poorly older DACs handle Redbook playback vs. many new models. Back then it made 100% sense to upsample. Now, not so much.  I think it is from that early time that audiophiles are still stuck on the myths of high resolution formats.

FWIW We use professional DAW software to create .wav files of 384 KHz 32 Bit Floating Point, and our Chord DACs sound better than ever replaying these on ROON with absolutely no DSP of any kind.  Higher resolution source files are better than any DSP we have ever tried over the last 5+ years.    Why 384?  There is laboratory data showing that the digital noise floor dissipates around 356 (see DXD specs), and 32 Bit Floating Point everything sound superior in every way to 24 bit and below; way superior [Try It You'll Like It]

If up-sampling is all you got:

Our experience has revealed that the DAC/Streamer up sampling to DSD 2.8/5.6 affects the most pronounced change in auditory information.

For Chord DACs the following is from Rob Watts...

"For Hugo 2/Qutest the signal path is: 1FS to 8FS input > 16FS WTA1 filter (49,152 taps) > 256FS WTA 2 filter > 3rd order 2048 FS filter > pulse array noise shaper at 104 MHz > analogue

When an M scaler is connected, the WTA1 filter is not used, and it is passed through to the 256 FS WTA 2 filter."

What this means is that sending any file that is less than 16FS (705.6 kHz or 768 kHz) will cause these Chord DACs to upsample internally... Sending 16FS will cause the first filter, WTA1, to be bypassed... This also occurs with the TTs and Daves although the WTA1 fillers have more taps...

With some upsampling software you also get the chance to use various filters to "shape" the sound... Anything from Linear phase sharp to Minimum phase slow...

Choices are good as everyones kit, room, ears and brain are different...

All DACs in one way or another "shape" their small signals... And some offer "pure" hardware as well as some choice of "filtering"... And then again some DACs offer you both NOS and some other options like upsample rates and filtering... Take the Denafrips Pontus II for example, very popular... Just one of many... As in hardware so also in software...

And where do you draw the line with so called "pro studio" vs consumer software... Seems like a price-point vs knowledge/experience thing...