With Impedance Matching volume controls from Destination Audio, you can use your existing stereo receiver to distribute your music all throughout the home. Jumpers and switches on the rear of the volume controls can be adjusted to compensate for the number of speakers in your system. This regulates the load the speakers are drawing from your amplifier and protects it from clipping. The Impedance Matching volume controls also include removable wire terminals. These are screw terminals that unplug from the rear of the Volume Control. The screws ensure that your wires will stay firmly connected while the removable terminal simplifies your termination.