Just a point to keep in mind regarding the specs for the Aegir amp is that it is rated into 8 or 4 ohms in stereo mode, but only into 8 ohms in mono. When a stereo amp is run in bridged mode to operate as a mono amp its output stage effectively sees the load impedance divided by two. So in mono mode an 8 ohm load is effectively seen by the amp as 4 ohms, and if it could handle a 4 ohm load it would be like the amp driving a 2 ohm load in stereo (which it is not rated to handle.)
So I'd be cautious about trying a 4 ohm speaker with these amps running in mono mode without first consulting with Schiit about the possibility. It could end up with too high of a current demand which could either cause damage or more likely engage the amp's protection circuit.
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