New from Grave Science are these superb passive switch boxes. Each unit is hand made and hard wired using only the finest quality cables and components. If you run 2 or more components with variable outputs, why use a Pre-amplier? Instead, we recommend you simplify things and use a Grave Science Switcher. Not only will you save money by removing an entire component from your signal path, you’ll significantly improve the performance of your hifi system. More info here