Designed for use in small meeting rooms and classrooms the sp 1100p are visionrsquos most cost effective audio solution and represent fantastic value great sound quality and visionrsquos trademark ease of installation are key features of this product digital the sp 1100p is assembled by a fully automated production line to ensure reliability and uses a quality yamaha class d digital amplifier chip volume on front the volume dial is on the front of the lsquomasterrsquo