Highline by Radial Engineering is a mono passive line isolator designed to connect guitars and Amp Modelers to PA systems without coloration, noise, or distortion. An industry-leading Jensen transformer ensures the necessary isolation to protect equipment from phantom power, while offering a linear frequency response from 10Hz to over 70kHz. Highline is built for demanding tours, with a thick steel casing and extremely robust components ensuring a high level of reliability.

Key Features

• Compact, pedalboard-friendly design


• No signal power or tonal loss when connecting to mixers


• High reliability and Radial build quality


• Jensen transformer with precision windings


• Ability to sum stereo sources to mono

Radial Highline (and Highline Stereo) is a passive line isolator that offers the definitive solution for musicians who use amp simulators on their pedalboards. Equipped with high-quality Jensen transformers, Highline is a device that ensures clean and clear signal, eliminating hum and noise with superior isolation. It also provides a balanced output for long cable runs without degradation. Thanks to its features and dimensions, Highline offers complete integration with other equipment and ensures a high level of reliability on stage and in the studio.

Protecting your Sound

Highline is a line isolator specifically designed to meet the needs of instrumentalists who use amp simulators, allowing them to connect seamlessly to a PA or recording system, maintaining full signal integrity without additional noise or distortion. Highline features a premium 1:1 Jensen transformer, which maintains the full volume level from the pedalboard to the PA, while providing galvanic isolation that eliminates ground loop noise for a clean, disturbance-free signal. Highline's balanced output allows connection to a PA using very long cables and blocks phantom power so that it never reaches the pedalboard. Highline can also accept stereo inputs and sum them to mono via the Sum switch.

Designed for Amp Modelers

Guitarists and bassists who use Amp Modelers on their pedalboard can encounter a number of problems. While amp modelers can produce line-level outputs, they often use unbalanced 1/4" connectors that don't support long cable runs without degrading the instrument's tone, and they are also particularly susceptible to ground loop noise when connected directly to the PA. The Highline solves these problems by inserting a 1:1 transformer into the signal path that isolates the setup, reducing noise, protecting it from phantom power, and maintaining a line-level signal.

Highline Applications

Connect your amp simulator to the PA

Highline allows you to send the signal from your guitar amp simulator directly to the PA, maintaining signal level and sound quality. The internal transformer provides isolation to reduce noise and protects equipment from accidental phantom power activation.

Sum a stereo amplifier signal to mono

'Highline can also be configured to accept a stereo signal and sum both channels to the XLR output, so you don't have to reconfigure any presets when space between PA channels is limited. Simply engage the sum switch to use the Thru jack as a second input.

Use the Thru for local monitoring

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

Highline Technical Specifications

• Audio circuit type: Passive, transformer-based


• Transformer: JT-11-YMPC


• Number of channels: Single channel (mono)


• Frequency response: 20Hz ~ 20KHz (± 0.05dB)


• Total harmonic distortion: <0.03% from 20Hz ~ 20kHz / -10dB, 0.0002 @1kHz / -10dB


• Phase deviation: ±0.3° from 20Hz ~ 20kHz / -10dB


• Signal to noise ratio: 110dB

Features

• Ground lift


• Extra: Input sum

General

• Construction: 14-gauge steel outer shell and 16-gauge chassis


• Finish: Durable powder coat


• Dimensions (L x W x D): 108mm x 70mm x 44mm (4.25" x 2.75" x 1.75")


• Power: Passive, no power required


• Conditions: For use in dry environments only, between 5°C and 40°C.