Dynamic Bass EQ is an innovative Klipsch technology specific to certain powered monitor models (The Fives, R-51PM, R-41PM). When listening to audio at lower volumes, the bass response/low frequency levels are usually not nearly as pronounced or present as they are in higher volumes. Dynamic Bass EQ works to boost those low frequency levels when listening at lower volumes. That way, even if you are quietly listening, you will still be enjoying full, rich, dynamic bass content.
Please Note: For best results, increase input source volume to maximum
For assistance on how to enable/disable the Dynamic Bass EQ on The Fives, please see our article - The Fives - Enabling/Disabling Dynamic Bass EQ