dac with sonos

You are correct - the Sonos has a DAC, but it's not audiophile quality. The things people add in between that and the outboard DAC are re-clockers, upgraded connection posts, and upgraded power (you can even have a battery pack rigged to remove the AC/DC conversion that causes problems).

You'll get plenty of people arguing about optical (Toslink) or coax (SP/Diff) connections. In general, coax seem to be the more consistently implemented connection on most devices, but some people prefer the sonic signature of optical. It comes down to trying each and seeing which you like better.

If you like the Sonos concept, I urge you to try the Slim Devices Transport. It's more expensive, but it is an audiophile quality piece of hardware. I chose against it because it is a little too refined for my tastes (I prefer the more vivid sound I get from my PS Audio DAC). If you are considering mods to Sonos, you will end up ahead of the game with the Slim Devices if you like it out of the box. They offer a 30 day in-home trial - if you don't like it, send it back.

I have a Cullen moded Sonos going into a Cullen Stage 3 moded PS Audio DAC and I still get a bit of noticeable jitter now and then. I listened to a Pace Car mod and heard less jitter, but was after other things with my mods too and didn't want the cost and clutter of a mod on top of a mod.

So long as you are pushing from a source to an outboard DAC of any kind using traditional connections, you're going to get jitter. Thus far, the ease of use of the Sonos interface outweighs my annoyance with jitter, so I'm happy enough. My hope is that standardized I2S interfaces catch on in the near term and we no longer have to compensate with these ridiculous fixes. Take a look at the new PS Audio PerfectWave to see what I mean.

Mikewdc - that harsh sound, often referred to as "hash" is indeed jitter. It's often difficult to pinpoint exactly what is going on or what will fix it, but we all know that it just doesn't sound "right." The human ear is an amazing thing that can adapt to a lot of different sonic qualities (warm vs. cold, refined vs. vivid) and room treatments (a 'live' room with lots of echo vs a 'dead' room with no echo or dynamics) but it has a very hard time with sound that is just plain 'wrong.'

Digital can introduce things like pre-echo (where the echo of a note precedes the note) and unnatural harmonics as it is anyway and jitter makes them stand out even more. As subtle as they might be, these things don't process as natural to the human ear and therefore stand out. It's one of the reasons so many audiophiles prefer vinyl.

What is the fix? Well, for the Sonos, one of the obvious issues was the clock in the device is a consumer level item, and not audiophile quality. Power conditioning and a good power cable helped as well. And a quality digital cable made a difference as well.

And now you know why this is an expensive hobby.