Which way do extended bandwidths extend?

[Rajveer]

I'm setting up my 5GHz wifi to use 80MHz for use with AC client, and I'm wondering which way does channel extension happen i.e. if I set my control channel to 60, what range of channels would actually be used to total 80MHz?

 

[L&LD]

Probably depends on the (closed source) parts of the firmware.

 

[RMerlin]

AFAIK, 802.11ac does not define two channels. Rather, it defines a central channel, and you will use 80 MHz of bandwidth centered on that channel.