I am putting together a system with Totem mains a 2 channel Bryston amp, probably a cheap adcom preamp/tuner and I also have a Tempest sub. I haven't bought an amp for the sub yet. What is the best way to hook this up? I confess to only ever having used Denon receivers, so of course they had a sub out? Maybe I should get a cheap receiver instead to use as a preamp?