If the power amp drives them well and then you add to that the Lyr's pre amp it could be too much. Which is why I said
it could be overkill. But if you max out the speakers and use the Lyr for volume control it can be easier controlling both channels.
Those should both be fine.
A typical power amp has no volume control, that is why I intend to use the Lyr as a pre-amp (volume control), just like any other "pre-amp -> power amp -> speaker" setup.
Anyways, I think ill have a chance to try it next week.