Monoprice SS-Pro 8 High Power 300W Dual Source Impedance Matching Speaker Selector - 8 Pair Audio Distribution for Home Theater & Multi-Room Sound System

If I believed the manufacturer when they told me that this unit was 19.8x11.1x19.6 I would never have bought it. I don't know where they are coming from, but I went with the picture they posted and it turns out the unit is 17L x8D x 3.25H, which is perfect for my PYLE 1000W Receiver.My system is 10 mono speakers spread around the house and out on the patio and this unit works well for that. I could add up to 16 speakers with this unit, using mono and a 1000w receiver. I wish someone made a speaker volume control for more that 100w per channel, but since they don't I went with this since it handles 300w per channel.There is no user manual and the videos on line are pretty useless, but it isn't rocket science, just hook up A speaker outputs from Receiver to A speaker inputs to speaker switch unit, then pop in the speaker wires into 1-8 inputs and you're ready to go.