Sonos DAC

Sonos does not support the USB output, I think. Digital coax or optical are the only choices. I prefer the digital coax.

That's a good question. I contacted Joseph, the owner of Audio Horizons, to ask. I've been using protoypes of the power supply for several months and have posted my praise of it elsewhere. So, how about offering it to other people?

Joseph told me that he has reached his targeted performance level but that he is not yet satisfied with cosmetics of the unit. The power supply is external and includes an IEC input, too, so that power cord can be improved. He has been been waiting for cosmetic samples of the power supply enclosure - the box into which the power supply circuit and connectors are mounted. He told me the supplier has been slower than expected but that samples should arrive next week.

I hope the product will come soon because I'm confident that you and other Sonos owners will like it very much.

There are at least two ways to improve the Sonos performance. Here I am referring to the ZP80, which has both digital and analog outputs.

I have seen an advertisement on Audiogon to upgrade the digital signal processing of the ZP80. I recall that the upgrade costs about $550. It ought to improve signal processing from both the digital and the analog output. I have not listened to any unit with this upgrade.

The second way to improve the ZP80 is to upgrade the power supply. I have listened to units upgraded in this way. It does significantly improve the quality of the output signal, adding weight to lower frequencies, while diminishing glare and improving articulation at higher frequencies. I use an external Audio Horizons tube DAC for attentive listening sessions. While I'm working around the house, I use the ZP80 analog outputs. I'm very pleased with the quality of the signal.

The power supply upgrade is not marketed yet - I am a Beta tester. It will be sold by Audio Horizons pretty soon, I guess. The cost should be about half as much as the digital signal processing upgrade mentioned above.

Thanks for the update. The Bel Canto is reported to be a warmer sounding DAC than the Benchmark. Your experience seems to support that report.
Down the road, you may wish to have the richer, fuller sound, but also a more articulate sound. If so, keep an eye open for the ZP80 power supply upgrade ofered by Audio Horizons. I mentioned it in an earlier post to this thread. I think it is well worth the investment.