With a four sub DBA or even a three sub DBA for that matter any decent sub will work. What type of music you listen to and how loud you like it as well as room size will dictate which models would best suit your needs. Any company that manufactures subs should have an in house tech that can help select the correct model for your system, if they don't, I would not buy from that manufacturer.
My personal experience is with SVS, Rythmik and REL and there are many other companies out there such as AudioKinesis and HSU that I have heard good things about from many other sub users.
One extra plug for Rythmik, they offer a couple of different amp options along with their standard option and one of those options has the speaker level input so you can get that input on any of their subs.
My personal experience is with SVS, Rythmik and REL and there are many other companies out there such as AudioKinesis and HSU that I have heard good things about from many other sub users.
One extra plug for Rythmik, they offer a couple of different amp options along with their standard option and one of those options has the speaker level input so you can get that input on any of their subs.