SP9 is our latest works, it has a lot of elements from SR11, same crossover and electrostatic driver design. We try to make a mastering grade monitor with simplified drivers at reasonable price. SP9 Continues SWEEAR’s Reference class top tier technology: multiple advanced electrostatic, BA and dynamic drivers, and new gen. quad-bore of IPP micro-acoustic. We developed a new extremely high frequency BA that perform clearly separation and rapid response. Like SR11, the electrostatic drivers give the ultimate transparency and layered soundstage.