The one i'm looking at: http://www.ebay.com/itm/Xbee-PRO-S3B-900HP-RPSMA-Wireless-Kit-250mW-28-miles-/221246295642?_trksid=p2141725.m3641.l6368
data speed is rated at 200kbps (not sure if this is bits or bytes)
google is saying that sound files are rated around 200kbps(mp3 file - Google Search)
Are they trying to say bits or bytes?..
What do you want to actually achieve? Generally Arduinos aren't suited to audio applications very well.
It really doesn't matter whether the XBee is capable of transmitting 200K bits per second or 200K bytes per second, since the Arduino is not capable of getting data to or from the Arduino that fast (even if its 200K bits per second).