The Devialet Phantom Implosion Speaker ($1990) measures 13.8 x 9.8 x 9.8 inches and has a frequency response of 16Hz to 25Hz. You can’t get much better than this. Most stand alone subwoofers will only get you down to 20Hz. It weighs 35 pounds and operates anywhere from 750-3,000 watts. All of this while producing crystal clear sound with no saturation and no background noise. The Phantom integrates a dozen technological inventions based on 88 exclusive patents. You can combine two Phantom’s, or even create a multi-room system. The system includes bluetooth, wi-fi, and optical to stream all your favorite tunes via your favorite services. The Phantom will be displayed at Apple stores starting this month, in case you want to hear it in person.