BOLD, PRO SOUND QUALITY WITH JBL’S EXCELLENCE: With Frequency Response at 65 Hz - 20.000 Hz and a 52 x 90 mm bass driver, the superior sound quality of these loud music speakers will not fall short of your expectations. Plus, thanks to its JBL PartyBoost feature that allows you to connect two JBL PartyBoost compatible speakers together for stereo or link, you can enjoy incredible sound quality even at bigger parties.