I repair a lot of mcintosh equipment, both vintage and modern. And I have heard a lot of their equipment. Every autoformer amp I’ve head has almost a non-cohesiveness between the low and high end. The reason mcintosh stated designing with them way back in the day is because they didn’t know how to design with the brand new transistor technology. After they figured out how to make a proper push pull output stage, they stopped using them. Then mcintosh brought them back just to be different. Worse actually.