Is Sonos downgrading / down-sampling all HD to 44.1 khz ? (24/48 --> 16/44.1 S2) What's the point?

  • 21 November 2021
  • 2 replies

Sonos Connect S2 devices (and I assume Port) seem to be down sampling all HD data to 44.1khz  (e.g. 24/48 khz local FLACs) through the digital out (e.g. Coaxial) to external DACs.  i.e. you cant get a HD digital signal out of your Sonos kit !!

I cant see the bit-depth on my DAC, so unsure if this is also being downgraded to 16 bit (but assume 16/44.1).

I assume this is the same for  streamed services also (e.g. Qobuz, Amazon HD etc.) being digitally downgraded to 16 / 44.1.

Whats the point??!!!   This would be surprising in 2015 . . . . .   but 2021 !!!    

I have had cheap Android STB for the last 10 years that digitally passthrough (up to 24/192, DSD files etc.).  Even services like HEOS etc. will send an untouched digital bit signal to the Receiver / DAC.

Can this option please be added (I understand coax, optical are bandwidth limited - but even 24/192 Stereo should be OK).   i.e. digital pass-through, or sampling at the original source rate at least!


Include it as an option please!   (S2 Software - Connect, Connect AMP, Port, Amp etc.).



Best answer by GuitarSuperstar 21 November 2021, 03:42

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Sonos supports up to 24-bit/48kHz FLAC and ALAC from a local music library on an S2 system:

Sonos can stream up to 24-bit/48kHz Hi-Res FLAC from Qobuz on S2 compatible hardware. Tracks with a sampling rate above 48kHz will be streamed as 16-bit/44.1kHz FLAC.

Sonos can stream up to 16-bit/44.1kHz FLAC with Amazon Music HD.

The S/PDIF output is 24-bit. It always has been, so as to accommodate volume adjustments to 16-bit input content without losing data. Only below -48dB (approx) does truncation start to occur with 16-bit input.