Apple, Cisco and Intel do not support 40MHz wide channels in the 2.4GHz band (even though Linksys, whose parent company is Cisco, DOES).
Also, the bottom 4 non-overlapping channels in the 5GHz band are extremely-limited in regards to legal power levels here in the FCC zone... so switch to channel 52 or higher for 5x the legal power levels (30dBm vs. 23dBm) of the bottom 4 channels; channel 149 and higher can use up to 20x more power (36dBm) than the bottom 4 channels.
While you did note that a T1 is only 1.54Mbps, you failed to mention that even premium cable speeds are rarely over 20Mbps, and a T3 is only 45Mbps (a T3 here in mid-michigan is about $2000/month, IF it's available at all), so even the reported 130Mbps connect speeds of 'narrow-channel' 802.11n provides enough bandwidth (about 60Mbps of true throughput) to saturate nearly any internet connection here in the USA.
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