Description of 5515-22: 55 Series Subwoofers are high SPL subwoofers that deliver the most bass for your buck. Implementing many of the same features found on our 75 & 95 Series SuperWoofers, the 55 Series can rock hard and loud for extended periods of time, while maintaining accurate and clean bass throughout the party. You will be impressed.The 5515-22 is a 15? dual voice coil, 400 watt, 2 ohm subwoofer built on the MTX tradition of getting more than expected. The 55 Series subs are often used in applications where bass levels are the most important factor. These subwoofers are designed to move air and go boom! They are true monsters of bass and are a great choice for anyone that really wants to be heard.This subwoofer also incorporates Spider Plateau Venting which is a mechanical cooling process that targets cool air at the voice coil and a radial ribbed t-yoke that acts as a heat sink effectively managing the subwoofer temperature for long term rocking performance.Description of CANON-XXL:The Rockville CANON-XXL is an XX large sized portable Bluetooth speaker that is engineered and DSP-tuned to have extremely deep bass with a very pleasant frequency curve. When you pick up this speaker you can feel the weight of the amplifier and the drivers. We give you 3 sound curves that all have amazing sound. Just press the M button to change from one sound curve to the next. The default one has a pleasant balanced curve while the second curve is a mid-boost mode great for rock music, and the 3rd one is an outdoor mode which will play louder high frequencies. All 3 sound modes have incredible sound.One of these units will be loud enough for a party but if you want to really get crazy, you can easily sync 2 of them together wirelessly with the TWS mode by simply holding down the BT button.This speaker is IPX5 rated so it can survive outdoors by the pool, beach or in the bathroom.This speaker has 4 batteries ran in series that boost the voltage to 14.8 volts.