A piece of kit that is always useful in both a live sound and recording situation is the direct box. They have a variety of uses and come in a wide variety of configurations. Direct boxes convert a high-impedance, unbalanced output signal into to a low-impedance balanced input. In a live sound application it can be used to run a signal from the bass guitar or bass amp into the mixing desk in order to give the sound engineer more control of the mix. Direct boxes will also guard against RF interference and problems associated with ground loops. In addition, they allow a sound engineer to run long cables without any loss in the quality of the sound. Active DI units will contain a pre-amplifier and can sometimes include a speaker emulator. At Musician's Friend we have an excellent selection of Radial Engineering Direct Boxes and Behringer Direct Boxes. All our Direct Boxes are supported by our price & satisfaction guarantees and free standard shipping now applies to all orders over $25, including many heavy items.