Thanks Wayne for Your reply.
Also, thanks to jrebman.
However, I still have some more questions. Maybe I just don't understand how the entire chain works. Sorry bout the confused questions

Firmware version 15 isn't supported by Slim Devices any longer. The latest versions do offer more features and sound very good. I am very happy using SlimCenter.
But Firmware newer than version 15 have inversed polarity, right? And since I am using a BC-modded squeezebox together with other sources (a turntable and a DVD) I need to have the same polarity = which means I am stuck with version 15? Or am I missing something?
You may want to try upgrading the software to SlimCenter and see how that works for you. You can always uninstall it.
I am already using SqueezeCenter (with firmware v15) on my Linux server. Works great.
But the reason I am asking is that I want to _replace_ my linux server with a Netgear ReadyNAS NV+.
It will give me a neater, smaller, safer, more quiet solution which is easier to fit in my home. It will also consume less energy and generate less heat.
So - I want to know if (and how) I can use a ReadyNAS _with_ SqueezeCenter and firmware version 15.
Or - how to solve the polarity thing with newer firmwares.
If it doesn't work, then I am stuck with my noisy old Linux server

.
If you cannot easily reverse the polarity of your speaker cables to keep the phase correct, please contact me.
Since my Squeezebox isn't the only source component, I need to have the same polarity on all source components.
I do not want to switch speaker cables each time I select another source component (e.g. from Squeezebox to turntable).
How is that accomplished with a firmware > version 15?
Sorry about my confused questions, but I guess I don't understand how to solve this problem.
Best regards

/ mats_rickard