The QUICKTRACK audio products from Protech Audio are designed to provide professional audio performance in a cost-effective utility package. Each of the new products is designed with features required in most audio applications. The Model MX409 has four microphone inputs, mixed to a common line output. Each microphone input incorporates a 15 volt phantom power circuit, which is activated by a push-on jumper. Each input has adjustable gain. All inputs and the output are electronically balanced. The output may be used in either a balanced or unbalanced configuration. Requires low voltage AC power. 4.5" mounting extrusion supplied.