Pricing and availability

We compare 600+ stores and found this item at 9 stores. Prices updated .

Sweetwater
3.0 (2)
$849.99
Amazon
5.0 (2)
$849.99
Vintage King
5.0 (1)
$849.99
Sole Source AV
$849.99
Front End Audio
$849.99

Average Price: $850

High-end/Boutique

$119

$300+

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Standard

High-end

Price History

Based on price data from 6 merchants for "Radial HDI Studio Grade 1-channel Active Instrument Direct Box". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Experience the pinnacle of direct box technology with the Radial HDI Studio Grade 1-channel Active Instrument Direct Box. This studio-quality gem is designed to bring out the best in any instrument, boasting premium Jensen transformers and an innovative Color control feature. Whether you're a purist seeking that pristine tone or an adventurer chasing gritty, amp-like distortion, the HDI caters to all. The Color knob seamlessly blends clean and colored sound, offering a wide sonic palette for any musician or engineer to explore.

The HDI's elegance lies in its simplicity, with a straightforward set of controls that make dialing in a record-ready sound a breeze. The oversized custom-wound Jensen transformer is key to adding that extra touch of warmth and saturation, which musicians have come to love. The built-in Opto compressor efficiently tames peaks for a smooth, controlled output, while the High-pass filter ensures unwanted low frequencies are kept at bay. Adding a Presence control to the mix allows for a high-mid boost, making your sound cut through with finesse.

Built to endure the rigors of both studio and stage, the HDI features a robust chassis with a stylish gunmetal anodized front panel. It's not just about looks; the HDI is engineered to deliver consistent performance, offering both mic and line-level outputs for versatile applications. The intuitive VU meter provides instant visual feedback, ensuring your levels are always just right.

Key Features:

  • Color knob for blending clean and distorted signals
  • High-pass filter for cleaning up low frequencies
  • Built-in "Opto" compressor for peak control
  • Oversized Jensen transformer for additional saturation
  • Presence control for high-mid boost
  • VU meter for at-a-glance level monitoring
  • Mic and line-level outputs for studio and stage use
Produce Like A Pro

Produce Like A Pro

A Must-Have for Recording Bass! | Radial HDI

Video thumbnail for A Must-Have for Recording Bass! | Radial HDI by Produce Like A Pro

A Must-Have for Recording Bass! | Radial HDI

Produce Like A Pro

Produce Like A Pro

Video thumbnail for Radial HDI Studio Grade Direct Box Demo by Sweetwater

Radial HDI Studio Grade Direct Box Demo

Sweetwater

Sweetwater

Video thumbnail for Going Direct In With The Radial Engineering HDI Direct Box by Vintage King

Going Direct In With The Radial Engineering HDI Direct Box

Vintage King

Vintage King

Video thumbnail for Radial HDI - What Does it Sound Like? by Deadbeat Studios

Radial HDI - What Does it Sound Like?

Deadbeat Studios

Deadbeat Studios

Reviews

Critic Reviews

HDI Studio DI Review: Radial's $800 Premium Direct Box | Tape Op Magazine

tapeop.com

The Radial HDI Studio DI is a top-tier, studio-grade DI box that impresses with its robust build and versatile features. It's lauded for its impressive tone-shaping capabilities, thanks to the COLOR and PRESENCE controls, which offer extensive control over saturation and frequency. However, the input labeling can be confusing, and the OPTO compressor may not suit everyone's taste due to its limited control options. The lack of a polarity switch is a minor oversight. Despite its high price tag, the HDI offers excellent value by potentially eliminating the need for additional mic preamps or EQs. Overall, a high-quality tool for serious musicians and studios.

positive

Radial HDI

soundonsound.com

Radial's HDI Studio Grade DI Box is a versatile tool that delivers a wide range of tones from clean to richly colored, thanks to its innovative design. It splits the input signal into clean and distorted paths, allowing musicians to blend these for the desired effect. The thoughtful connectivity options and high-quality components make it suitable for both studio and live settings. While the unit is pricier than standard DI boxes, its quality, versatility, and intuitive controls justify the cost. Minor gripes include the synth input overriding other inputs, but overall, it's a stellar choice for those seeking a high-definition direct box with character.

positive

Front of House Magazine reviews the Radial HDIFACE | Foundation for Audiovisual Commerce & Engineering

face.be

The Radial HDI breaks the generic direct box mold with its studio-grade design and creative features, offering a versatile sound ranging from pristine clarity to warm, vintage richness. Its guitar amp topology and Jensen transformers deliver impressive sonic warmth, while the intuitive controls make it quick to dial in the perfect sound, crucial for live settings. The HDI’s robust build and reliable performance shine, though it's on the pricier side compared to simpler options like the Radial J48. Its high-end appeal is somewhat offset by the risk of unwanted setting adjustments during gigs. Overall, a stellar choice for those seeking top-notch tonal flexibility in the right setting.

positive

Mixdown's Picks: Radial HDI Studio Grade Direct Box - Mixdown Magazine

mixdownmag.com.au

The Radial HDI Studio Grade Direct Box is a top-notch choice for bassists seeking a high-quality direct injection preamp. This DI box is packed with features like saturation, optical compression, and sound coloration, making it a versatile tool for any recording setup. Its ability to handle everything from classic electric bass to modular synths without distortion is impressive, and the intuitive controls for distortion and brightness add life to any instrument. While its large footprint might be a concern for some, its performance as a bass recording powerhouse is largely unrivaled, making it a worthwhile investment for serious musicians.

positive

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Artist usage

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See how Butch Walker uses Radial HDI Studio Grade 1-channel Active Instrument Direct Box

Butch Walker

Guitarist, Singer

Train

...
Verified via YouTube

In the video "EPIC HOME STUDIO Setup 2022 | Butch Walker (studio tour)" by Andrew Masters on YouTube, at the 34:38 mark, a Radial HDI Studio Grade 1-channel Active Instrument Direct Box is visibly placed on top of the Universal Audio OX box in Butch Walker's studio, confirming his use of this equipment.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Radial HDI Studio Grade 1-channel Active Instrument Direct Box, it is most commonly used with the following gear.

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