I have a good idea since I really like how the Edirols sounded so I decided to use the Edirols with my JBL SUB135 then the bass will go down to 35hz -6db. So basicaly the freq response will be 35hz to 35kHz -6db. In the future I am planning to get the Edirol MA-15D since that's the latest version of the Edirol studio monitors.