Enjoy a deeper, richer sound wherever you want with your EXTRA BASS2 speaker. The passive radiators work with two full-range speakers, optimising low frequencies and delivering rich bass.the SRS-XB23 fits perfectly in the cup holder of your camping chair, making it ideal for open-air festivals.hang it in your tent or on a nearby tree - wherever you want to enjoy your favourite beats. The Sony-designed X-Balanced Speaker Unit achieves high sound quality and powerful sound pressure for a rich, intense and comfortable listening experience. Unlike a conventional speaker unit, the membrane of the new X-Balanced Speaker Unit in the XB23 is not round. The non-round shape maximizes the area of the diaphragm and increases the sound pressure level for more intense bass. The excursion is reduced while maintaining sound pressure levels. This results in less distortion. The lightweight yet rugged speaker cone is made of MICA-reinforced cellulose (MRC) and, together with the dust cap, contributes significantly to the sound quality. The arrangement of the passive radiators on the sides has been optimised to achieve a clear bass response. The SRS-XB23 was designed with comfort in mind. So you can enjoy music anytime, anywhere without any complications. Whether it's a conference call or a conversation with friends: With the hands-free kit you can make hands-free calls in comfort.