JBL BassPro 12 delivers 150 Watts of powered noise-free deep bass thanks to JBL's patented Slipstream port technology. The Slipstream port is mathematically engineered to keep airflow with the port turbulence-free, which avoiding the common shortcoming of traditional ported boxes. Coupled with the built-in 150Wrms amplifier the BassPro 12 really delivers. Also the Bass Volume Remote control is included for easy adjustment, no more stopping to pop the trunk. Features and Benefits Slipstream Port Technology - The Slipstream port technology eliminates turbulence which eliminates noise, inarticulate bass when driven. Reliable Performace - To ensure that the BassPro 12 stands the test of time, ew utlise the rigorous quality control and testing standards. Lifecyle testing pushes each product to its limits, with 200 hours in an environmental testing chamber. Here we freeze them, bake them and give every product a subrun with 150 hours of ultraviolet light. Speaker products are also subjected