# Compatible I2S source devices **URL:** \ **Category:** DACs\ **Created:** [July 12, 2014, 2:55pm UTC](https://forum.psaudio.com/t/compatible-i2s-source-devices/1336 "2014-07-12T14:55:17Z")\ **Posts on this page:** 1\ **Showing post:** 595
**Author:** ![Carousel](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/carousel/32/155545_2.png) [@Carousel](https://forum.psaudio.com/u/Carousel)\ **Post date:** [May 2, 2022, 8:27pm UTC](https://forum.psaudio.com/t/compatible-i2s-source-devices/1336/595 "2022-05-02T20:27:05Z")
Well, without having any technical basis, just mathematician intuition, my notion would be to let PS Audio / Ted Smith processes upscale 16-44K PCM direct to DSD, instead of having an interim PCM level provided by other gear. See Ted’s comments in [Upscaling before Directstream? - Audio Components / DACs - PS Audio](https://forum.psaudio.com/t/upscaling-before-directstream/20510). But I have to admit that I do not know jack about “Rob Watts’ unique filter technology”. Though Tom Stockham himself told me in the late 1980s that 16-44K was not picked only so as to fit Beethoven 9 on a single CD disc. It was also because humans could not detect better. But, yeah, that was with equipment from like 40 years ago… --- _[View the full topic](https://forum.psaudio.com/t/compatible-i2s-source-devices/1336)._