Basically, you will find a few mod companies for the Sonos.
A power supply mod replaces the whole switch mode tiny PSU, which W4S does not do.
Look at fidelity audio which has the psu mod but not the upsampling portion.
Either get the W4S and have a custom psu connected, it runs 12v and also a 3.3v which can be tapped of the 12v, 2A psu will be fine.
Or, if you cannot have the PSU customed (seperate unit), you could go with offering with a linear PSU and add the W4S remedy reclocker. This option adds more in cables.
The works run into to an esoteric dac equals redbook cd's played by the esoteric transport, though very slight and negligable presentation differences.
This works if you are not into hi-rez music, i don't find many titles for hirez interesting. A lot is also hit and miss! Totally satisfied with cd quailty upsampled.
The reason why upsampling is important with the sonos is that it opens up the sound making music more transparent and have better separation (more hirez sounding, if you would) and you really need this option together with a good psu, like for any piece of equipment is critical.
I do run my router direct with wireless function off, power also by a linear psu.
