SPL Control One - Studio Monitor ControllerControl One: The Monitor Controller with innovative features, developed for fast workflow and impressive sound quality. For us the sound is always in the foreground. When it sounds good, we like to listen. To get such a sound, you need experience and technical finesse. SPL has incorporated both into the Series One. Speaker and Subwoofer You can listen to your production via two switchable pairs of speakers. A subwoofer is also switched on and off with