Reduced transmit rate on new dual band AEBS vs older AEBS 802.11N, gigabit

Hi,
I recently upgrade my AEBS from the older 802.11N Gigabit version to the dual band version. The new 2.4ghz part works fine for my iphone, however the 5ghz signal has much slower throughput. previously I could routinely get 270Mbps, now I am lucky to get 160Mbps. the new 5ghz signal is on the same frequency (48), the same multicast rate, and has wide channels selected. When I plugged the older model back in and tested it the throughput was the same 270Mbps so it is not some new interference.
Anybody else see anything like this? Do the two radios on the AEBS interfere with each other somewhat?
any ideas? Did I just get a dud unit or is this common (fixable?)?
Thanks

Hi Bob,
Thanks for your reply. My situation is a bit different as I have various wifi units from different locations (some US, some European, some Japanese, etc, etc). As such I need to pick a frequency that works for everything, and on my previous non dual band AEBS channel 48 worked fine. I have tried channel 161 just for curriosity and it made no difference. The transmit rate is listed at between 216Mbps and 27Mpbs but as soon as you attempt to transfer anything it drops significantly. I have also tried to time the difference between my new dual band AEBS and the older one and, regardless of what the connection speed is saying, the new one is definitely slower.
It isn't unusable by any means, I just thought it was odd and I have never seen it mentioned on any of the reviews of the new dual band units.

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