No increase in file transfer speed?

AEBS n connected as a wireless bridge, all networks showing up. IMAC is wired to Linksys router and AEBS is ethernet connected to Linksys. I don't get any increase in speed in transferring files over the network between an IMAC and Macbook which are both n capable.

Definitely on the low side as a good connection at 2.4 GHz would be in the 110-130 range and 220-270+ at 5 GHz. You should see these values if your computer is within 10-15 feet of the router with no obstructions.
Might be worth the time to download a utility like iStumbler to get a look at signal strength and noise on your network. This will also display other networks around you that may be on the same channel or a close adjacent channel to your wireless, causing interference.
Any nearby cordless phones are always suspects as well. If you have them, turn them off for a few hours and restart the network to see if that makes any difference.
I assume that the wireless card in the computer is up to speed with other connections, etc., otherwise could be a loose antenna connector in the MacBook not allowing the available signal to be used.

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