The REL will give you much more deeper bass and low details. I auditioned the 400's (mk l) and did prefer the bass response... more weight. In contrast, I used my REL B3 (from my Home Theater) with crossover set at 38Hz and 23Hz and with incredible results.
I would continue to play with the crossover. What is the setting for the crossover?
I would continue to play with the crossover. What is the setting for the crossover?