The AVAA C214 and AVAA C20 are very comparable in terms of performance. The main difference lies in the design and size, which make the AVAA C214 easier to integrate into a room. What's more, the AVAA C214 can be individually controlled via a smartphone app to turn it on and off and to adjust the gain. Gain can be reduced on both models if the device shows signs of instability in its environment (where it is positioned). On the AVAA C214, it is also possible to increase the gain and make it more efficient.