Andrew, the same answer always applies: it depends on how loud the level at your listening position is and how wide the dynamic range of the program material is(some almost uniformly loud pop material has a range near zero).

The 2311 or similar can easily drive your Axioms to beyond a safe listening level at typical home listening distances and have adequate capacity for brief peaks on the most dynamic classical and other material. Unused headroom is simply that: unused.

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Enjoy the music, not the equipment.