Hafler DH500 is definitely not my choice for an amp for these. IMHO, the DH500 and P500 have "emaciated" power supplies... incapable of the current output that a LE14H-1 needs, to do bass well. I've even seen small HK integrated amps spank Hafler DH500s, on high-current-draw situations... the Hafler would just "lose it" on bottom, while a little 50w/ch HK amp would just "pound away"...
My suggestion? A beefier amp, such as an Aragon 4004 or 8008, Harman-Kardon Citation 22, NAD 218THX, Crown DC300A, or the like. Then, watch the pictures rattle on the walls...
Regards,
Gordon.