I’ve had Maggies for most of the last 40+ years.
All that time I HAD to have bass & treble controls to compensate for lower level listening.
Last year I had to downsize and after shoehorning my 5½ foot tall speakers into the smaller room, I finally came to the heartbreaking conclusion that it was time to sell the Maggies.
I bought a pair of Kef R300’s. Not the most efficient speaker in the world but way more efficient than the Maggies had been. I also got a Parasound NewClassic 200 Integrated amp. It was represented as being accurate and musical, plus it had my precious bass, treble and even sub level controls...all of which could be adjust via remote from the listening position.
I don’t know if it’s the sensitivity or the Coax drivers, but I haven’t used any of the tone controls since getting the room set up for the last year...I just run the controls flat and it sounds great.
Sure, I miss the humongous sound stage of the Maggies, the the Kefs hold their own and the sound at lower volumes is excellent.
Zu’s are very sensitive, yet your not having good luck...so maybe it’s not the sensitivity that is helping me out here. I haven’t listened to Zu’s so I have no idea how they are voiced.