MBL is an awesome speaker. One of the most serious speakers in the world. MBL can be brutally revealing and difficult to drive. Bring your A game or keep looking. I've heard Convergent amps drive the heck out of them, but a lot of really good amps will struggle at some point to keep their composure.
We should reject hard-to-drive speakers more often
Sorry I know this is a bit of a rant, but come on people!!
Too many audiophiles find speakers which are hard to drive and... stick with them!
We need to reject hard-to-drive speakers as being Hi-Fi. Too many of us want our speakers to be as demanding as we are with a glass of wine. "Oh, this speaker sounds great with any amplifier, but this one needs amps that weigh more than my car, so these speakers MUST sound better..."
Speakers which may be discerning of amplifier current delivery are not necessarily any good at all at playing actual music.
That is all.