I have AIR-AP1141N-A-K9 access point, but can not get over 130 Mbps speed. Looking at the manual it appears that I need to set "channel width" to 40-above or 40-below, but it only accepts 20. Is the 2.4Ghz radio limited to 20Mhz? Since the specs indicate that it can do 300Mbps, I must be misunderstanding something.
I have this problem too.