Thank you for your response Bill! My Velodyne sub frequency nob goes from Direct to 40hz. Just so I understand correctly, I need to set the sub to 40hz and then set the pioneer sub crossover obtion to 80hz? What are the settings for the Klipsch tower speakers, Klipsch center channel, and Yamaha rear surrounds? I attached some specs on my speakers, sub and receiver. 1- Klipsch tower speakers 2. Klipsch Center Channel 3. Velodyne sub and 4. Pioneer sc-75.