HK has very good amp section, and can handle low impedance speakers without difficulty.

I would suggest you stick with it for now, plug in your new speakers and see how you feel about it after a week or two. Remember, too, that Axiom speakers are some of the most efficient on the market, and require less power to play loudly than most.

My gut feeling is that unless you want to play it real loud, or have a very large room, your HK will be plenty sufficient.