|Not to be critical but...|
"The key thing I see on your Xirrus screen shot is that you're using channel 1. That's part of the reason for the slower speed"
That's not correct. 1,6 and 11 are non overlapping and equal. There is no bandwidth limitation based on channel. Only concern is not to overlap channel wise with a neighbor.
" Mbs are a measure of bandwidth."
Its Mbps as in megabits per second
Getting off my soap box, Curt R is right that wifi has far more overhead though you should see better rates. But this depends on your router and wifi adapter. Not all "N's" are created equal.
Unfortunately I see no mention of router make and model. That would have been helpful.
The lowest end of N is 54 Mbps up to 600 Mbps [never seen that myself]. Looking like between the router and adapter its defaulting to the lower band.
First suggestion is make sure your wifi adapter has the latest drivers loaded
Second suggestion, if your router supports it, is to set your wifi speeds to the highest they go. 300 Mbps is what my 2.4/5Ghz wifi is set to.
Answers are only as good as the information you provide.
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Sorry no tech support via PM's
message edited by wanderer