The subwoofer can definitely be removed. I also think the amp on the subwoofer enclosure is a separate amp. The main amp for the other speakers should be located somewhere else.I probably don't need subwoofer often, but I need a lot of storage space for longer trips. Is it possible to remove the subwoofer temporarily using regular tools or is it bolted in the trunk permanently? If yes, does the audio work without subwoofer?