I had been thinking a long time whether the SUB is worth the money and if you do hear a significant difference. I have tested it both now with a pair Play3 and the soundbar. I can confirm to everyone that you definitely hear a difference. You can test it by using the Sonos app SUB other during the song or the movie on and off. At least here you will notice the difference and is convinced. The SUB is hidden with me in a corner of the room. PS: My wife hears of course no difference and is the acquisition nonsensical.