The MBL 101 series is reported by many to be a tough speaker to drive. I have not heard of this "issue" with the other mentioned MBL speakers. I suggest you search threads here on A'gon to learn about these speakers and pros/cons by real users and those who have tried many amps.
Rather than read a bunch of worthless posts on suggestions of one's favorite "powerful" amps and the flavor-of-the-month ARC preamp, I suggest you read this as a good start.
Rather than read a bunch of worthless posts on suggestions of one's favorite "powerful" amps and the flavor-of-the-month ARC preamp, I suggest you read this as a good start.