Using a Magni as a pre-preamp is a way to boost the
signal so there's not a dramatic
difference in volume settings between source inputs. It might work for you. That's assuming you
have your AVR's volume already turned up fairly high and you still need to run your
Freya's volume control at max. What AVR are you using?
The tricky part is determining how much additional gain you
need in order to have the HT input voltage similar to your other sources. The 12dB gain of the Magni may or may not be enough for your situation.