This is a powered cabinet that can be used for a modeling unit whether it be a Helix, Quad Cortex, Kemper, Tonex, or many other units. The “Plus” means it has IR’s in it and can be controlled to switch between them via midi. It also could be used with a keyboard or bass head. It can be set to have a flat response whatever the application. Also, it can get very loud and has high headroom. It comes with a very tough quality padded cover. I am the original owner and have only used it very lightly.