JBL speakers are available in a wide range of sizes and models, and the frequency range of each speaker can vary. However, many JBL speakers are designed to produce frequencies within the range of human hearing, which is generally considered to be between 20 Hz and 20,000 Hz (20 kHz). Some JBL speakers are designed to produce frequencies outside of this range, either higher or lower, depending on the design and intended use of the speaker. For example, some JBL speakers are designed specifically for use in the low-frequency range, such as in subwoofers, while others are designed to produce high frequencies, such as tweeters.