The free upgrade policy (where they pay for postage of the lower model speakers you are returning and you only pay the price difference between the speaker models) is confined to the 30-day period following purchase of new speakers (I'm in the process of doing this myself - the coolest part is I went with factory outlets and they let me keep the original speakers for weeks till the upgraded models arrive).
But as Bridgman suggests, it's worth giving Axiom a call and see if they will do something for you.
Good luck - Paul
