W4S Connect Modification worthwhile???

First off, how is the CONNECT attached to the network? It's reported that some of these aftermarket mods can compromise wireless performance. Some users have also found that the unit runs hotter than normal.

Personally I'd be a bit sceptical about spending a small fortune on a warranty-destroying modification. Ages ago IIRC the jitter (from a ZP80 I think) was measured and found to be in the inaudible range. And any decent DAC will reclock the signal anyway.

Of course if you buy the mod the effect to you personally will be "like night and day", because that's how expectation bias works. 😉 Whether it's objectively changed anything to the sound which reaches your ears will be open to debate.

I am one of the CONNECT users ratty refers to. I experienced both the issues he referred to, but my ZP90 could be wired if need be. What really concerned me was the temperature of the W4S modified ZonePlayer. I felt I would not sleep easy or feel comfortable going out with it left switched on. YMMV, but I opted to return it, losing a fair bit of cash as a result.

On a more positive note, I am convinced it did make a real difference to the audio quality, something I cannot match with my bog standard CONNECT replacement. But while my CONNECTs are both slightly warm on their top surface, nothing to worry about.

Would a modded unit support MQA on Tidal/Sonos?
Nobody knows whether (a) any Sonos unit would be capable of software MQA decode, (b) MQA would permit it commercially, or (c) Sonos would be minded to even attempt it. They've said that, whilst there's just possibly an argument for greater bit-depth, they can't see the logic of higher sample rates.

I have the Cullen Circuits Modified ZP 90. It is night and day difference from the standard ZP90 (I have both). If you have a high end system it is well worth it. Still needs to connect to a good DAC to take full advantage.

What is the modification supposed to do?
IIRC these mods claim to reduce the output jitter, and some upsample. Since (a) ZP80 (yes, that old one) was once measured as having 'low' jitter and (b) a decent DAC will re-clock and upsample anyway, I'm struggling with the 'night and day' bit.

The wonders of placebo. As our friend Kumar sometimes remarks, a drop of adult beverage can have a similar effect on the brain's music appreciation.

Unfortunately not. Sonos makes three changes to the bit stream (even with fixed volume):

Sonos HAS muddied the waters here, but how much of this change is audible in a controlled test is still an open question. But the muddying of the waters is enough to have audiophilia nervosa raise its head.

Of course, in the context of the thread, in terms of whether a Connect mod is worthwhile, this is probably not relevant. And I still maintain that spending the money on some decent single malt, turning down the lights, and enjoying the music with no sleep lost over voided warranties is a better way to go. The only real tweak needed may be a bump up of the volume control to compensate for the slightly lower signal voltage from the analog outputs of the Connect compared to that from most CDPs/DACS.

YMMV, obviously.

And I doubt that with its focus on play units, streaming services, voice control and home automation integration, Sonos cares much about this issue now.