I have had the .7 and the 1.7i driven by amps that delivered 150watts @ 8 ohms, 300 watts @ 4 ohms respectively and never had an issue. Right now as I wait for the arrival of my LRS+ I am enjoying the hell out of a pair of original MMG’s. With an integrated with the power output rating mentioned above.
I listen at very conservative volume levels. I once sold off a Threshold amp at a significant loss - not that I’ve ever profited from selling a piece of gear - because I assumed the meters were malfunctioning. The buyer sent me an email a few days after the sale to tell me that everything was fully functioning, it was simply that the level I mostly enjoyed just wasn’t moving the meters. Sheesh.
Now that may appear to be really low, but it wasn’t. I think many people would be surprised to learn how meager the output may be at a consistent volume level that doesn’t shake the window panes. When I buy amps or integrateds I do look for those that double the 4ohm load from the 8ohm load - it’s the current that matters most. It’s not necessarily a deal breaker, but the amps/integrateds that I’ve found to be the best matches for Maggies and Thiels all did that.
I fell in love with Maggies years ago when the first released the MMG model. $600 was a bargain. I’ve had 5 models to date, and five different Thiel models, and now I’m sticking to Maggie, specifically the LRS+. I haven’t heard it, but I’m relatively sure they will be an improvement over the MMG.
Because the MMG “only” reaches 50hz I bought a REL T5 sub as a complement. After a few extended listening sessions I removed it. No slight against the REL, but when I listened at slightly higher volume I felt that the sub wasn’t needed. I’m not talking Led Zeppelin IV here, that just won’t do, but the genres I listen to most nowadays simply do not require that degree of bass.
Enjoy.