Highline Stereo by Radial Engineering is a passive line isolator designed to connect guitars and Amp Modelers to PA systems without colorization, noise, or distortion. An industry-leading Jensen transformer ensures isolation to protect equipment from phantom power, while offering a linear frequency response from 10Hz to over 70kHz. Thanks to its construction with a steel enclosure and quality components, Highline Stereo can handle the most demanding tours with great reliability.

Key Features

• Two-channel isolator with stereo Thru outputs


• No signal power or timbre loss when connecting to mixers


• High reliability and Radial build quality


• Jensen transformer with precision windings


• XLR and Thru Sum options for greater versatility

Highline Stereo is a passive line isolator that offers the ultimate solution for musicians who use amp simulators on their pedalboards. Equipped with high-quality Jensen transformers, Highline Stereo is a device that ensures signal purity and clarity, eliminating hum and noise with superior isolation, and provides a balanced output for long cable runs without degradation. Compact and suitable for installation on pedalboards, Highline Stereo offers full integration with these devices and great reliability on stage and in the studio.

Protect Your Sound

Highline Stereo is a line isolator designed specifically to meet the needs of instrumentalists using amp simulators, allowing them to seamlessly connect to a PA or recording system, while maintaining full signal integrity without additional noise or distortion. Highline Stereo features premium 1:1 Jensen transformers, which maintain the full volume level from the pedalboard to the PA, while providing galvanic isolation that eliminates ground loop hum for a clean, noise-free signal. Highline Stereo's balanced outputs allow for long cable runs to the PA, also blocking phantom power so it can never reach the pedalboard. Highline Stereo can be easily reconfigured for multiple summing setups; two switches allow connection to the PA or stage monitors in stereo or mono.

Designed for Amp Modelers

Guitarists and bassists who use amp modelers on their pedalboards can encounter a range of issues. Although amps come with line-level outputs, they often use unbalanced 1/4” connectors that do not support long cable runs without degrading the instrument's timbre, and are also particularly susceptible to ground loop noise when connecting directly to the PA. Highline Stereo resolves these issues by inserting a 1:1 transformer into the signal path that isolates the setup, reducing noise, protecting it from phantom power, and maintaining the signal at line level.

Highline Stereo Applications

Connect your amp simulator to the PA

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

Sum a stereo amplifier signal to mono

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 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 Stereo Technical Specifications

• Audio Circuit Type: Passive, transformer-based


• Transformer: JT-11-YMPC


• Number of Channels: Two channels (dual mono)


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


• Total Harmonic Distortion: <0.05% from 20Hz ~ 20kHz / -10dB, 0.0008 @1kHz / -10dB


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


• Signal to Noise Ratio: 112 dB

Features

• Ground Lift


• Input Connectors: XLR sum, Thru sum

General

• Construction: 14 gauge steel outer shell and 16 gauge frame


• Finish: Durable powder coat


• Dimensions (L x W x D): 127mm x 84.1mm x 45.5mm (5”x 3.3” x 1.8”)


• Power Supply: Passive, no power required


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