Markous- just make sure you set the gains on your amp carefully. These SD-3's are easier to bottom out than the other beefier models. But when you get it set right they are really nice. Do you plan on doing a separate chamber sealed box or shared chamber sealed.....or something else? I know how good my single 12 sounds, and I bet two would be pretty nice. What is your frontstage consist of? I have a full active HAT 3-way front stage in mine.