No I never use them both the same time! Either I use DPS and deactivate Boom 3D completely or vice versa (thats my security threat!). They both have their advantages. DPS has plenty of different speaker-sound-curves as presets and a virtual woofer. I use DPS when listening to my external speakers. Whereas Boom 3D has his advantage in a virtual 5.1 Stereo (Surround) for headphones, but also different presets. So it’s a personal preference.