https://en.wikipedia.org/wiki/IEEE_802.11ac

• Wave2 can be 2.34 Gbps
• multiuser multiple input, multiple output (MU-MIMO)
• stronger performance:
  • spatial stream:
  • Wave 1, the only options were 20, 40, and 80 MHz channel ,
  • wave2 adds the option for 160 MHz channel width
• brings more bandwidth and flexibility
  • can operate in both the 2.4 and 5 GHz frequencies.