That provides bass extension

CD Sound Machine with Digital Tuner• Incredible Surroundâ,,¢ Feature unique to Philips that creates the illusion of the speakers beingmuch further apart than they actually are, resulting in an enhanced,room-filled stereo effect.• Bass Reflex Speaker SystemAcoustic system that enhances the upper bass tones to provide awarmer, punchier bass sound.• Two Way Speakers Provides higher musical clarity and enhanced stereo sound quality.• Digital Tuner with 29 Presets• 14-Key Remote Control • Dynamic Bass Boost • CD Player • Single Cassette Deck• Output Power: 30W PMPO