Radial Engineering HIGHLINE Passive Line Guitar Amp IsolatorAmp simulators are more popular than ever, but they present a unique set of problems for guitar and bass players who want to interface them with a PA system. While amp sims can produce line level outputs, they often have " unbalanced connectors that aren't designed for long cable runs, and they encounter hum and buzz from ground loops when connected directly to the PA. The Radial Highline is a premium line isolator designed specifically for amp