Well, just like ( dlcockrum ) said, that ( stringreen ) above nailed it, and I agree. stringreen, that was a very good answer, and now I'm going to put something in and see if I can nail it as good as stringreen.
This is something that I have kept in my notes for many years and I thought I share it with everybody since it's perfect for this discussion.
From the old "Audio magazine" ( February 1991 issue, page 74, The late and great speaker designer Jim Thiel of Thiel speakers wrote
"speakers will sound better with one very good amp than with two lesser amps". He also went on to say that your speakers should always be used with the best stereo amp that can be afforded rather than splitting the available money between two amps.
I think this is one of the very best pieces of advice a stereo manufacturer can give a customer and I agree. A really good $10,000 dollar retail price amp should always be able to beat a pair of mono blocks that retail at $5000 dollars each, basically. This is just my opinion as well.
By the way, I never owned Thiel speakers, but I always liked them.