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From Pedal to Performance

Radial Highline & Highline Stereo



The Highline and Highline Stereo are passive line isolators designed to connect guitar and amp modelers to a mixer for live touring and recording applications. Both models feature premium Jensen transformers for exceptional audio performance. The Highline offers a single-channel solution, while the Highline Stereo provides a two-channel option, catering to diverse setup needs without compromising on sound quality.

Highline

Passive Line Isolator

Compact & pedalboard friendly design

No loss of signal strength or tone when connecting to a mixer

Radial’s renowned reliability & build quality

Precision-wound Jensen Transformer

Ability to sum stereo sources down to mono

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Elevate Your Tone


The Highline and Highline Stereo are line isolators designed to meet the needs of instrumentalists using amp modelers, enabling seamless connection to a PA or recording system while preserving signal integrity with no added noise or distortion. Both models feature premium Jensen 1:1 transformers, which retain full volume levels from the pedalboard to the PA and provide galvanic isolation to eliminate ground loop noise for a clean signal. The balanced outputs allow for long cable runs, and they block phantom power from reaching the pedalboard. The Highline can also accept stereo inputs and sum them to mono with the Sum switch, while the Highline Stereo offers more flexibility with two summing switches, allowing users to choose between stereo or mono configurations for PA or stage monitor setups.

Highline Stereo

Stereo Passive Line Isolator

Two channel isolator with stereo Thru outputs

No loss of signal strength or tone when connecting to a mixer

Radial’s renowned reliability & build quality

Precision-wound Jensen Transformers

XLR and Thru Sum options for added versatility

More Info

Designed for Amp Modelers


Guitarists and bassists using amp modelers on their pedalboards face unique challenges: while amp sims can produce line-level outputs, they often use 1/4" unbalanced connectors that aren't suitable for long cable runs without degrading tone and are highly susceptible to noise from ground loops when connected directly to the PA. The Highline addresses these issues by incorporating a 1:1 transformer into the signal path, providing isolation to reduce noise, protecting against phantom power, and maintaining the signal at line level for direct PA connection. Similarly, the Highline Stereo tackles these problems by integrating 1:1 Jensen transformers, ensuring isolation, reducing noise, protecting against phantom power, and preserving the line-level signal for seamless connection to the PA system.

Connect your amp sim to the PA image

Connect your amp sim to the PA

The Highline allows you to send the signal from your guitar amp sim right to the PA while retaining the signal level and sound quality. The transformer inside provides isolation to reduce noise and protects your gear from accidental phantom power activation.
Sum a stereo amp sim to mono image

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 image

Use the Thru to monitor locally

When using a mono source device with the Highline, you can take the Thru output to a stage amplifier for local monitoring, while the XLR output feeds the PA system.