Eldartford,
Are you quite sure that it's the DAC reconstruction (analog) filter that is responsible for the degraded sound in oversampled/upsampled systems??
I feel that it is the over/upsampling (digital) filter - the one that various manuf. use to do the estimation - that is largely responsible for the degraded sound. By the time it gets to the reconstruction filter, the sound is botched already & the analog filter cannot fix this. Yes, it can degrade it further! However, I still feel that the principal damage is done in the digital domain.
Afterall, over & upsampling were used so that the manuf. could get away from designing a nearly brick-wall filter, which had a transition band from 20KHz-22.05KHz.
It's those estimation (digital) filters that change the harmonic structure of the sound. The algorithms are manuf. dependent & you might like one manuf's & hate another's.
(In the Scott Nixon tube DAC he uses the output tube as a filter by just relying on the vacuum tube's natural freq. response characteristic to low-pass shape the music signal).
Are you quite sure that it's the DAC reconstruction (analog) filter that is responsible for the degraded sound in oversampled/upsampled systems??
I feel that it is the over/upsampling (digital) filter - the one that various manuf. use to do the estimation - that is largely responsible for the degraded sound. By the time it gets to the reconstruction filter, the sound is botched already & the analog filter cannot fix this. Yes, it can degrade it further! However, I still feel that the principal damage is done in the digital domain.
Afterall, over & upsampling were used so that the manuf. could get away from designing a nearly brick-wall filter, which had a transition band from 20KHz-22.05KHz.
It's those estimation (digital) filters that change the harmonic structure of the sound. The algorithms are manuf. dependent & you might like one manuf's & hate another's.
(In the Scott Nixon tube DAC he uses the output tube as a filter by just relying on the vacuum tube's natural freq. response characteristic to low-pass shape the music signal).