AC AP selection

[yuval_ben_ari_6]

I am trying to choose an AC AP for our new office.
I was looking at the R600 spec and have problem to understand the client limit spec:

Concurrent Stations	Up to 500 clients per AP
Simultaneous VoIP Clients	Up to 30

What does the VoIP Clients limit means? is that WiFi users that are using VoIP application such as Skype or a different type of connection supported by the AP?

Also, is there any spec that mentions the coverage distance of the AP?

[ismael_kouma]

Wave2 in R610 and not in R600

[yuval_ben_ari_6]

How relevant is this technology? Does it require any client support? Any downsides to R610 vs R600 except price?

[ismael_kouma]

And also around 300$ of difference Lol