Human 81 bookshelf speakers?

Lindisfarne: Thanks for your recommendations. Actually I'm looking for lowest possible low freq. thus eyeing on 81, how do you compare 61 to 81? Sonically, they are different? Also the price is the cheapest for 81! I'm not sure there is other models even go lower...?

Grinnell: My amp is Class D Audio SDS-400C, more than enough power for most bookshelf speakers, better than Marantz PM6005

used Ref 3A de capos great low end hi eff at 92db

Grinnell: Thanks for your opinions. For the price, I better save more money for Dynaudio Focus 160, at least be DynDude once. I'm afraid most probably I'll have to look else where...

Buy the de Capos used often around 1200.00