SONY SRSULT70B Wireless Portable Speaker

Boost the sound to enhance your music Enhance your low-end frequencies for exceptional bass and feel how powerful the sound is. Powerful bass to feel the beat and get you dancing Hit the button. Feel the bass. Press the ULT button to enjoy the powerful sound of ULT1 and ULT2. Select ULT1 for deeper, lower frequency bass. Select ULT2 for powerful, punchy bass.