The SHURE's SCM268 is an analog mixer with six transformers, including four transformer balanced XLR microphone-level inputs, one transformer balanced XLR mic/line output, and one internal low stray field, toroidal power transformer. All of the audio transformers protect the SCM268 from RF interference, eliminate ground loops, and make it extremely quiet. Even better, with a sturdy half-rack chassis and rock-solid rack mounting hardware, SCM268 can be simply fit into a variety of smaller applications.