Bose sound system

I recently upgraded to a 2016 Volt from a 2013 Volt. I'm very impressed with the Bose sound system. I'm especially impressed with XM satellite radio. In the past I've thought it wasn't worth the money to pay for radio (after the free trial period runs out). But with the Bose system (mostly newer) music sounds great, with thundering bass and great range and separation. Modern music has a lot of bass. I've listened carefully, but I haven't heard any buzzing or rattling or distortion. It sounds very solid. Of course it is new. I'm rethinking paying for radio. I wonder if anyone can tell me where the sub-woofer is. Or is there one?