Talk to me about CAT 6 in wall cable

Thanks @germay   Nice summary.  I don't know why anyone would not want to use a 'better' cable for audio.  We (I) are always looking for improvements in our sound.  EZ to do once, hard to replace.

Speaking of hard to replace, I’m having a new home built.  The builder only uses cat6 cable for ethernet but here’s the rub, they do not allow any subcontractors, other than their own prior to drywall, to run cable plus I even gave them a detailed diagram for the wiring and they still got it wrong. I basically asked for one cable to be run from where the ISP provides service in my garage to a patch panel I will place in an interior closet.  Then separate cable runs from the patch panel out to the different endpoints.  Well, they ran all cables from the garage out to each endpoint.  I was not happy because I do not want my router and WiFi access point in a garage that's not climate controlled and it’s going to cost me a substantial amount to have my contractors wire, in a hot attic in a finished home, as documented.  I was a wee bit miffed to say the least.  Fortunately, I’m getting the Cat6A cable I want and having them run some high quality speaker wire above the ceiling to where my rear HT speakers will be located.

@germay  I know the feeling. Most of the time unless you really stand over some of these contractors, you will not get the job you are expecting. Luckily I now have an electrician who is also a musician, so he has some idea about sound reproduction. I will discuss CAT 6A with him, which I think should be the best option. 

@daveyf Don’t be surprised by the higher cost difference between Cat 6 and Cat 6a.  Most music infrastructure devices will never use the full speed capabilities of 10G with Cat 6a cable.  I’d be surprised if they even use 100 MB.  I work in IT and just have a desire for speed, "just in case" and for the possible future needs if my Internet Service Provider (ISP) can even supply it.  Very few ISP’s claim they can provide 2G, let alone 10G and above service to residential areas.  The only one, that I’m aware of, that can provide 10G residential service is Sonic (sonic.com) and that’s mostly on the US west coast and Dallas area. 

I don’t know what your needs are currently other than music/video streaming so it’s a "future proof" proposition to go Cat 6a and you will probably never have to rewire your home again.  It also depends on how many devices you have on your network. There are a lot of variables, mostly cost and your ISP, that come into play when determining your needs.