 In the 2010s, most subwoofers, bass amplifier cabinets and sound reinforcement system speaker cabinets use bass reflex ports, rather than a sealed box design, in order to obtain more extended low-frequency response and get more Sound Pressure Level (SPL).The speaker enclosure designers and their customers view the risk of increased distortion and phase delay as an acceptable price to pay for increased bass output and higher SPL.That said, if one is designing a sound system for a style of music where very accurate, precise bass rhythms are an important part of the genre, one may wish to consider the merits of sealed box woofers and subwoofers.