---
product_id: 6691875
title: "Radial Engineering R8001010JDI Single-Channel Passive Direct Box with Jensen Transformer"
brand: "radial engineering"
price: "RM2132"
currency: MYR
in_stock: true
reviews_count: 13
category: "Radial Engineering"
url: https://www.desertcart.com.my/products/6691875-radial-engineering-r8001010jdi-single-channel-passive-direct-box-with-jensen
store_origin: MY
region: Malaysia
---

# Passive design needs no power source Jensen transformer for pristine signal Ground lift switch eliminates buzz & hum Radial Engineering R8001010JDI Single-Channel Passive Direct Box with Jensen Transformer

**Brand:** radial engineering
**Price:** RM2132
**Availability:** ✅ In Stock

## Summary

> 🎸 Elevate your sound game—transform your signal, ditch the noise, own the stage.

## Quick Answers

- **What is this?** Radial Engineering R8001010JDI Single-Channel Passive Direct Box with Jensen Transformer by radial engineering
- **How much does it cost?** RM2132 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/products/6691875-radial-engineering-r8001010jdi-single-channel-passive-direct-box-with-jensen)

## Best For

- radial engineering enthusiasts

## Why This Product

- Trusted radial engineering brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rugged Steel Build:** Compact, road-ready steel chassis shields your sound from interference and stage wear.
- • **Buzz-Free Ground Lift:** Say goodbye to annoying hums and ground loops for flawless live and studio sound.
- • **Versatile Input/Output:** 1/4" input & thru, balanced XLR output, plus polarity flip and pad switch for ultimate control.
- • **Power-Free Passive Design:** No batteries or phantom power needed—pure, reliable signal isolation anytime, anywhere.
- • **Studio-Grade Jensen Transformer:** Experience ultra-clean, vintage-quality audio with zero phase & harmonic distortion.

## Overview

The Radial Engineering R8001010JDI is a premium single-channel passive direct box featuring a renowned Jensen transformer that delivers pristine, vintage-quality audio with virtually zero distortion. Designed to eliminate buzz and hum from ground loops, it offers versatile connectivity with 1/4" input/thru, balanced XLR output, and essential controls like ground lift, polarity flip, and pad switch. Its rugged steel construction ensures durability and electromagnetic shielding, making it a must-have for professional musicians and AV pros seeking reliable, power-free signal isolation.

## Description

JDI Passive Direct Box

Review: Terrific Passive DI - The other reviewer gave excellent specifics about the tone and feel with vintage instruments and amps. This is what this box was designed for and where it will really shine. My application is a little different. I wanted a quality "passive DI" for multimedia and for the occasionaly electric-accoustic guitar input. What is a DI (AKA a Direct Box)? A DI is basically a device that in the most basic sense electrically isolates and transforms unbalanced line level signals (signals from most stage instruments and most consumer electronics) to balanced line level (on both powered and unpowered lines) singnals commonly found on PAs and stage mixers used for mics. There are two categories...Passive and Active. Passive DIs do not require any addition power source like batteries or AC input. They are simply a transformer that transforms the input signal to an output signal. I will skip the physics of it though. Active DIs are a little more complex and generally cost more. Sound quality on cheaper models can be really horrible. These DO require additional power such as batteries or "Phantom Power" on the higher end units. Without getting too deep into the physics here, these are essentially a pre-amp and depend on the unit's "rail voltage" to prevent clipping. The more dynamic the insturment and performance, the more rail voltage you'll need. As I said though, this is passive DI so it's produces a nice subtle sound curve even as it reaches satuaration (passive DI speak for overdrive.) Rather than clip they "fill up." Why do you need a DI? Whether your using an insturment or a multimedia device like a DVD, iPod, or laptop...these will almost always be unblanced line level outputs either thru 1/4" jack, 1/8" jack, or RCA jacks. Just using a cable adaptor to mate these with the common 3-pin XLR for balanced line level signals found on PAs and mixers will at the very least cause you to loose sound quality and level. Potentially buzz and hum, possibly (and acutally very likely) short out your devices audio output OR even worse, damage the input line on the PA costing you dearly. Many professional mixing consoles use Phantom Powered mic lines and these will instantly overpower any device mensioned above. Instead you need something to transform and isolate the two halfs of the system. This devices transformer and circutry does just that. Also there is an electrical difference between balanced and unbalance signals. This DI does, convert the unbalanced input to a balanced output sent over XLR. The details. First off, I pleased to say that this unit is the newer model JDI. This is not the mk3, but the next gen. I'm very happy about that dispite the description. Inside this box is a genuine Jenson audio transformer, reguarded for their superior sound quality especially with vintage equipment. On the input side you get a 1/4" in and 1/4" thru for passing to a stage amp. Or you can use "merge" button and combine the two jacks to convert a L and R stereo signal to mono. Nice for multimedia and keyboards. I'm using a Hosa 3.5mm TRS to Dual 1/4 in TS (1/8" stereo jack to dual mono 1/4" jacks) for my application. On the input side is a "pad switch" to soften sounds like MP3 and CD players. On the Output side is a single balanced XLR output (1 channel mono), a 180 degree "flip switch" for reversing polarity to work with foreign made sound equipment. It has a ground lift switch to isolate grounds and get rid or noise due to ground loops. The device is built to isolate grounds automatically, but if you still have noise you suspect due to grounds, try this. Lastly is a speaker parallel button that I'm not entirely sure what it's used for. it's small in size, about 4"x6"x1.5" and roughly 2 lbs. It's made of a solid steel case to protect it from damage on stage while at the same time create an "EM cage" to shield the internal electronics from outside interference. All in all it's a great box with excellent sound quality. It's far more than I need, but I hope to grow into it. For users that don't want to spend an arm and a leg Radial does make really great DIs that aren't as expensive. For AV/multimedia users there's the ProAV1 which is purpose built as a swiss army knife solution for hooking your audio out to any PA or stage mixer. For instrument users there's as many DIs as stars in the sky to fit any budget.
Review: The best passive direct box - Built like a tank and great audio.

## Features

- Equipped with Jensen transformer
- Eliminates buzz and hum from ground loops
- Virtually zero phase and harmonic distortion

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002GIRAC |
| Best Sellers Rank | #35,635 in Musical Instruments ( See Top 100 in Musical Instruments ) #99 in Recording Signal Direct Boxes |
| Color Name | Green |
| Customer Reviews | 4.8 4.8 out of 5 stars (116) |
| Date First Available | April 4, 2017 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.8 pounds |
| Item model number | R8001010 |
| Material Type | Stainless Steel |
| Product Dimensions | 4.25 x 6.5 x 3.25 inches |
| Voltage | 240 Volts |

## Images

![Radial Engineering R8001010JDI Single-Channel Passive Direct Box with Jensen Transformer - Image 1](https://m.media-amazon.com/images/I/71KQF70mljL.jpg)
![Radial Engineering R8001010JDI Single-Channel Passive Direct Box with Jensen Transformer - Image 2](https://m.media-amazon.com/images/I/71Qmmo+IP8L.jpg)
![Radial Engineering R8001010JDI Single-Channel Passive Direct Box with Jensen Transformer - Image 3](https://m.media-amazon.com/images/I/41qAz87Ig4L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Terrific Passive DI
*by D***X on February 16, 2011*

The other reviewer gave excellent specifics about the tone and feel with vintage instruments and amps. This is what this box was designed for and where it will really shine. My application is a little different. I wanted a quality "passive DI" for multimedia and for the occasionaly electric-accoustic guitar input. What is a DI (AKA a Direct Box)? A DI is basically a device that in the most basic sense electrically isolates and transforms unbalanced line level signals (signals from most stage instruments and most consumer electronics) to balanced line level (on both powered and unpowered lines) singnals commonly found on PAs and stage mixers used for mics. There are two categories...Passive and Active. Passive DIs do not require any addition power source like batteries or AC input. They are simply a transformer that transforms the input signal to an output signal. I will skip the physics of it though. Active DIs are a little more complex and generally cost more. Sound quality on cheaper models can be really horrible. These DO require additional power such as batteries or "Phantom Power" on the higher end units. Without getting too deep into the physics here, these are essentially a pre-amp and depend on the unit's "rail voltage" to prevent clipping. The more dynamic the insturment and performance, the more rail voltage you'll need. As I said though, this is passive DI so it's produces a nice subtle sound curve even as it reaches satuaration (passive DI speak for overdrive.) Rather than clip they "fill up." Why do you need a DI? Whether your using an insturment or a multimedia device like a DVD, iPod, or laptop...these will almost always be unblanced line level outputs either thru 1/4" jack, 1/8" jack, or RCA jacks. Just using a cable adaptor to mate these with the common 3-pin XLR for balanced line level signals found on PAs and mixers will at the very least cause you to loose sound quality and level. Potentially buzz and hum, possibly (and acutally very likely) short out your devices audio output OR even worse, damage the input line on the PA costing you dearly. Many professional mixing consoles use Phantom Powered mic lines and these will instantly overpower any device mensioned above. Instead you need something to transform and isolate the two halfs of the system. This devices transformer and circutry does just that. Also there is an electrical difference between balanced and unbalance signals. This DI does, convert the unbalanced input to a balanced output sent over XLR. The details. First off, I pleased to say that this unit is the newer model JDI. This is not the mk3, but the next gen. I'm very happy about that dispite the description. Inside this box is a genuine Jenson audio transformer, reguarded for their superior sound quality especially with vintage equipment. On the input side you get a 1/4" in and 1/4" thru for passing to a stage amp. Or you can use "merge" button and combine the two jacks to convert a L and R stereo signal to mono. Nice for multimedia and keyboards. I'm using a Hosa 3.5mm TRS to Dual 1/4 in TS (1/8" stereo jack to dual mono 1/4" jacks) for my application. On the input side is a "pad switch" to soften sounds like MP3 and CD players. On the Output side is a single balanced XLR output (1 channel mono), a 180 degree "flip switch" for reversing polarity to work with foreign made sound equipment. It has a ground lift switch to isolate grounds and get rid or noise due to ground loops. The device is built to isolate grounds automatically, but if you still have noise you suspect due to grounds, try this. Lastly is a speaker parallel button that I'm not entirely sure what it's used for. it's small in size, about 4"x6"x1.5" and roughly 2 lbs. It's made of a solid steel case to protect it from damage on stage while at the same time create an "EM cage" to shield the internal electronics from outside interference. All in all it's a great box with excellent sound quality. It's far more than I need, but I hope to grow into it. For users that don't want to spend an arm and a leg Radial does make really great DIs that aren't as expensive. For AV/multimedia users there's the ProAV1 which is purpose built as a swiss army knife solution for hooking your audio out to any PA or stage mixer. For instrument users there's as many DIs as stars in the sky to fit any budget.

### ⭐⭐⭐⭐⭐ The best passive direct box
*by J***S on November 16, 2025*

Built like a tank and great audio.

### ⭐⭐⭐⭐⭐ Nice..
*by J***Z on April 1, 2015*

Nice... Nice product!!!!. The result was reduce 80% the interferences comming from my guitar (the cage inside my guitar, made by copper tape, shield it, but just make a properly ground and other kind of noise was present). This passive direct box gives sound clarity and definition to guitar signal, so, a warm and balance signal go inside the effects, besides ELIMINATES THE GROUND LOOPS THAT LAPTOPS AND OTHER DEVICES CREATE, however take in mind.... is completely necessary connect the XLR out to get results of 100%, in other way, you'll notice a effectivity of only 80% on ground loop and noise reduction. Finally have to comment that the noise gate effect is only needed at 30% after use this direct box, before, was mandatory use it until 100%. Guitar signal does not get any kind of weird color, remains pure. Last step in my effec loop before recording, it is to use the radial StageBug® SB-6 Isolator to kill the noise spreads from effects!... Thx

## Frequently Bought Together

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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-03-09*