Obviously there is something wrong, the 60's are by far better performers than the 40's. Did you leave the bi-amp clips in place between the speaker wire terminals? The 60's are also very easy to drive, the receiver should have not problems.

Are you running an Auto Setup EQ on the receiver, if so turn it off.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85