Radial Engineering Unveils Highline for Amp Sim Pedals – Inside Look at NAMM Show 2025

Radial Engineering has long been a go-to for professional-quality DI boxes and signal solutions, and at NAMM 2025, they’re taking things a step further with two purpose-built innovations: the Highline and Highline Stereo line isolators. Designed specifically for amp simulator pedals like IK Multimedia’s Tonex, Strymon’s Iridium, and Universal Audio’s Ruby and Dream 65, these units ensure that the tone you’ve worked so hard to craft reaches the audience with absolute clarity. Visit Radial Engineering to learn more about these groundbreaking tools.

The Innovation Journey

The Highline and Highline Stereo aren’t just another set of DI boxes—they’re designed from the ground up to maintain the sonic integrity of amp sim signals when sending them to front of house or a recording setup. Guitarists and bassists using amp modeling units know the frustration of a compromised signal—darkened tones, unexpected coloration, or unwanted noise can all kill the vibe. Radial’s solution? High-quality, one-to-one Jensen transformers that deliver a clean, high-headroom signal with excellent common-mode rejection, ensuring every nuance of your tone stays intact.

Impact & Vision

Radial Engineering has built a reputation for rugged, road-ready gear that touring musicians and studio professionals trust, and the Highline series fits right into that legacy. These isolators are particularly useful for players who rely on pedalboard-based amp sims, removing the guesswork when plugging into front-of-house or studio interfaces.

As Radial’s Austin put it at NAMM:

"We know how hard guitar players and bass players have worked to get their guitar tone where they want it to be… The last thing you want is sending your signal to front of house and having something kind of muck up the sound… You want something that you can trust to provide the tone that you worked so hard to make and that will help you connect with the audiences you’re wanting to connect with."

Behind the Technology

At the core of the Highline and Highline Stereo are premium Jensen transformers that provide superior isolation and minimal signal degradation. The result? A hot signal with low noise and exceptional fidelity, making them perfect for professional live and studio applications. The rugged build Radial is known for ensures these units can withstand the demands of touring musicians while maintaining reliability night after night.

Our Perspective

Radial Engineering has a long history of making products that just work, and the Highline series continues that tradition. These isolators solve a very specific, very real problem for players who use amp sims, giving them confidence that their tone will translate accurately in any mix. If you’re running a pedalboard-based amp sim and want a reliable way to send your signal, the Highline and Highline Stereo are a rock-solid choice.

Future Outlook & Final Thoughts

With amp modeling technology becoming more sophisticated, players are relying on direct signal paths more than ever. Radial Engineering’s Highline and Highline Stereo arrive at the perfect time, offering a no-compromise solution for modern players who demand both tone purity and reliability. As amp sims continue to evolve, Radial’s dedication to transparent signal paths ensures these tools will remain essential for years to come.

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