I am getting an integrated amp for a new 2-channel system. is there a product similar to the Outlaw ICBM but designed for just 2-channel stereo (I'm cheap )? Because I need a way to get my bookshelf speakers to work with my subwoofer. Or do I just hook my subwoofer to the pre-amp out/amp in of the integrated? I'm really confused about how to make it work. Why can't stereo gear have a "sub-out" jack like surround gear?