Does your stereo need a subwoofer?

Subwoofers are often associated with booming home theater setups but when you make the right choices, your stereo can improve drastically from adding a subwoofer. So how do you do that? Relevant videos: About my reference setups: https://youtu.be/Qw762D_rseI Subwoofer placement: https://youtu.be/-5pehTOZeV4 What about loudspeaker impedance?: https://youtu.be/8DL6cH3K0tw If you like my work, support it through: My Patreon page: https://www.patreon.com/theHBchannel Paypal: https://www.paypal.me/theHBchannel My book:https://youtu.be/rZ4Yai4Xh6Y My links: My site: http://www.theHBproject.com/en My channel: http://www.youtube.com/c/TheHansBeekhuyzen My Facebook page: http://www.facebook.com/hansbeekhuyzen My Google+ page: http://www.google.com/+TheHansBeekhuyzen My Twitter: https://twitter.com/hansbeekhuyzen My reference sets: http://thehbproject.com/en/About About Questions: https://youtu.be/YCNnUq6SbKg What DAC is the best: https://youtu.be/EykkzxUstL4