Radial Engineering Highline Passive Line Isolator

The Highline is a line isolator that is specifically designed to address the needs of instrumentalists who use amp modelers, allowing them to seamlessly connect to a PA or a recording system while maintaining their full signal integrity with no added noise or distortion. The Highline features a premium Jensen 1:1 transformer, which retains the full volume level from the pedalboard to the PA, while also providing galvanic isolation that eliminates ground loop noise for a clean and noise-free signal. The balanced output of the Highline allows for long cable runs to the PA, and it also blocks phantom power so it never reaches the pedalboard. The Highline can also accept stereo inputs and sum them down to mono with the use of the Sum switch.

Designed for amp modelers

Guitarists and bassists who use utilize amp modelers on their pedalboard have a unique set of problems: While amp sims can produce line-level outputs, they often still use 1/4" unbalanced connectors that won't support long cable runs without degrading the tone of the instrument, and they are particularly susceptible to noise from ground loops when connected directly to the PA. The Highline addresses these issues by inserting a 1:1 transformer into the signal path, which provides isolation to reduce noise, protects against phantom power, and keeps the signal at line level for direct connection to the PA system.

Highline Stereo Applications
Connect your amp sim to the PA
The Highline Stereo allows you to send the signal from your guitar amp sim right to the PA while retaining the signal level and sound quality. The Jensen transformers inside provide isolation to reduce noise while protecting your gear from accidental phantom power activation.

Sum a stereo amp sim to mono
The Highline Stereo can also be configured to accept a stereo signal and sum both channels to the XLR output, so you don’t have to change any cabling on your pedalboard when channel space is limited at the PA. When the XLR outputs are summed together, the Thru outputs can still operate in stereo.

Use the Thru to monitor locally
The Thru outputs can be used to monitor your signal locally on one or two stage amplifiers. If using a single stage amp, press the Thru Sum switch to automatically feed both channels to the amp, while maintaining a stereo signal at the XLR outputs.