Philips Powerful XSL Acoustics The slim mono-body of the SBA2900 portable speaker system slips easily into your pocket or bag. Share the powerful and realistic stereo sound stage with friends wherever you are, and experience amazing rich bass quality even at low volume. Built-in speakers featuring XSL Acoustics for dynamic sound Enjoy dynamic sound and powerful bass performance from your ShoqBox with XSL Acoustics. Impressive sound is produced by combining bright, brisk treble and mid range sound with elastic, powerful bass. Innovative use of high-tech materials like titanium cone and neodymium magnet deliver sound output that's nearly double the power of a traditional speaker driver of the same size. Precise tuning between the speaker driver, the small acoustic architecture and the circuitry ensures superbly dynamic sound and optimizes bass performance from the smallest sound enclosure.