I apologize for the typo " Quirks" .. What is deemed "expensive" varies... This said, something like the Bryston 28B, the Pass higher powered Pass for example he Pass X1000.5 , Krell, De Vialet 800, Plinius, other powerful and stable amps. To be on the safe side I would venture at least 500 watts/ch at 8 Ohms and doubling down types, stable amplifiers would likely work well with the Q5. They don't need to be expensive. Those also would work well if they have the required power and stability...
Magico,is too optimistic with their sensitivity ratings.The Q5 is likely a 82~83 dB speaker in real life. The Q7 is probably under 90 dB too.
Wow...good to know. I had not appreciated that about the Q7 as well. I have never investigated but had read about the Q5 being a beast to drive (as well as the original Magico Mini)...