I think Q3 certainly can be matched with lower power amplifier but it certainly will benefit from more power as well but not quite to the same degree as Q5. Soulution 710 120w certainly will drive it very very loud in medium size room. However, like V3 and Q5 (to a lesser degree), it can benefit from a bit more power. On my Lamm M2.2, I have 2 options, high gain mode with 220W in 8 ohms, 440w in 4 ohms or low gain mode with 220W in 4 ohms with more bias into class A. Generally Lamm recommends using low gain mode for any speakers with 1-6 ohms impedance. At least with Q3, I prefer using Lamm in high gain mode as dynamic and bass does improve quite a bit. Not that I discourage low output amps as I think the midrange/treble would be very special with low power tube amp but there may be some trade off as well.