If you haven’t check there are you tube reviews of the Aegirs in monoblocks. There are two that I know of and one opined that the Aegirs don’t really suffer in terms of SQ when used as a monoblocks. It’s not officially rated with 4 ohm speakers but I run it with a pair (4 ohms) and so far my speakers has not gone into protection mode at all. There are a lot of 4 ohm speakers though that just won’t work . And as long as you have efficient speakers the Aegirs in Monoblocks have plenty of power and really improves the bass performance Vs Stereo Aegir . The stereo Aegir is really great by itself as long as your speakers are efficient. And although the Vidar has more power and a little more bass , the Aegir sounds better. I started with a stereo Vidar and I used the LOKI a whole lot, moved on to the Aegir and used the loki very seldom. I can’t really use the loki now that i have Aegir monoblocks because i prefer balanced sources , but I am satisfied with the Aegir monos . I don’t really miss the Loki. Just sharing my experience. Thanks