Just got a new airport extreme WiFi ac version. I've also got an older airport express (you're that plus direct into wall socket) that is WiFi N. This is used on a different floor to extend. I hanged iPhone 6, iPad air that can use WiFi ac. So as the AExt is WiFi ac, the AExp WiFi N will it actually be worse to have the express in the circuit? I actually bought the extreme to hopefully make my network WiFi better. It was running with a 3rd gen time capsule which had WiFi N. I've disconnected this, and the express, but thinking now should I re-add the TC back to help WiFi on a different floor to the extreme, or will the TC pull down the signal to? Is this what happens in network situations, as in it will always operate at lowest speed?