On my router i have multiple wireless modes on AC. By default its on 802.11 a/n/ac mixed. The other options are 802.11 a only, 802.11 n only, 802.11 a/n mixed, 802.11 ac only. I've heard that AC is the best wireless mode but I don't know if it is better alone or mixed or something completely different. I have a TP-LINK Archer T6E which has 5ghz. Someone please help 😀 Thanks