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The Roger Nichols Gear Collection

Radial ProDI

Item ID: ProDI

Passive Mono Direct Box with Custom Transformer and Rugged I-beam Construction

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From Our Research Team:

High-quality Direct Box from Radial!

The Radial ProDI is a high-quality, passive mono direct box that's perfect for use with acoustic guitars, bass guitars, electric pianos, and synthesizers. The ProDI's custom transformer helps to deliver the highest performance possible, virtually eliminating issues with noise. And, as with all Radial DI boxes, the ProDI is incredibly reliable and easy to use — just plug in your mono instrument and instantly eliminate ground loops, while enjoying a rich, full sound. If you need the same excellent quality, in a stereo version, Radial also offers a stereo version of the ProDI, the ProD2.

Raidal ProDI Passive Mono Direct Box at a Glance:
  • Full-range passive direct box
  • Custom isolation transformer eliminates noise
  • Really easy to use
  • Built like a tank

Passive vs. Active DI
The Radial ProDI and ProD2 (stereo version) are full-range passive direct boxes. Active direct boxes employ electronic circuits to change the impedance from hi-Z to lo-Z and balance the signal. Passive DIs instead employ a simple passive transformer to do the work. Active DIs require batteries, 48V phantom-power or external power supplies to power their circuits, while passive transformer-equipped direct boxes do not require any power to perform their task. The advantage of a transformer over typical active circuits can be summarized as "a great device to reduce system noise" in a sound system. To accomplish the task of noise elimination, the Radial ProDI and ProD2 features first-class transformers and require no batteries or power supply.

Custom Isolation Transformer
The Radial ProDI is equipped with a custom-made audio transformer, which provides exceptional signal handling without saturation. More importantly, the ProDI's custom transformer has extremely low phase distortion in the critical bass and mid regions. The ProDI's transformer provides 100% isolation, to eliminate hum- and noise-causing ground loops, while maintaining signal integrity. Inside the ProDI you'll also find isolated XLR connectors, to eliminate chassis ground potential, as well as a military-spec PC board, with full surface ground plane to reduce susceptibility to RF noise. The result is exceptional clarity and definition, at an attractive price point.

Really Easy to Use
The best feature of the ProDI is "plug and play" ease of use. All you do is connect the instrument to the 1/4" inputs, the 1/4" through jack to the stage amplifier(s) or mixer and the XLR output to the mixing console and you are done. Any distortion? Hit the -15dB pad. Any noise? Just depress the ground lift switch. You will find that with acoustic guitars and basses, the natural tone of the instrument will shine through with a smooth and musical rendering. For electrically powered devices, such as keyboards, the ProDI will immediately eliminate troublesome ground loops while delivering solid dynamics, with a full rich sound.

Solid Construction
Look inside a ProDI and you'll find the build quality and components to be of only the highest professional standards. Radial's proven construction methods and materials ensure years of trouble-free service — able to withstand the rigors of the most demanding, high-use professional environments. Radial pioneered the use of its innovative "book cover" design, which provides a protective zone around the switches and connectors that keeps the components safe. The 14-gauge welded I-beam inner chassis and 14-gauge outer shell found in the ProD2 and ProDI greatly reduce the possibility of torque stresses being applied to the PC board. Stress on circuit boards causes broken and intermittent solder joints, a common cause of failure in commercial rental and other high-use environments. A full-bottom no-slip rubber pad works double-duty by providing protection from electrical shock and making sure these DI's stay put.

Radial ProDI Passive Mono Direct Box Features:
  • Full range passive direct box
  • Isolation transformer eliminates noise
  • Very low harmonic and phase distortion
  • Compact and rugged design
  • Ideal for live sound and studio.
  • Isolated XLR connector eliminates chassis ground potential
  • Custom audio transformer on input provides 100% isolation to eliminate hum- and noise-causing ground loops, while maintaining signal integrity.
  • Military-spec PC board, with full surface ground plane to reduce susceptibility to RF noise
  • High grade switches — long life, high cycle for reliable performance
  • 14-gauge steel welded I-beam construction makes it virtually impossible to torque the PC board
  • -15dB pad reduces the level going in from loud sources that could overload the circuit and cause distortion
  • Book-end design creates a protective zone around the switches & connectors, indestructible 14-gauge steel construction
  • Full no-slip rubber bottom pad provides mechanical isolation, electrical insulation and prevents unit from sliding around
  • Balanced male XLR output connector, AES standard with pin-1 ground and pin-2 hot
  • Lift switch lifts the ground to pin-1 on both channels.
  • Heavy-duty baked enamel finish for excellent durability

The Radial ProDI offers superb performance, at an affordable price — ideally suited for use with acoustic guitar, bass and keyboards!

ProDI Image Gallery

Specification Detail
Type Passive DI
Channels 1
Inputs 1 x 1/4"
Outputs 1 x XLR, 1 x 1/4" thru
Height 1.75"
Depth 4.25"
Width 2.75"
Weight 1.2 lbs.
Manufacturer Part Number R800 1100

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Reviews

based on 10 reviews

Excellent! Pure signal thru and No noise!

by Gary DeJong from South Dakota
December 21, 2011
Music Background: Musician
I have always used low priced DI boxes, because I didn't really understand what they did. I just knew I had to convert my guitar signal through one of these to run long distances through the snake...... read more [+] until the sound engineer at a show came up and said, "Use this DI box. I'm getting noise through yours." He handed me the ProDI, and what a difference! I still don't really know how they work, but I do know there is a huge difference. I bought my own! close [-]

Absolutely Worth It

by Jared from
October 12, 2011
Music Background: Soung Guy / Average Guitarist
Never thought our direct boxes were that big of a deal until I went to buy a new one. I thought the $30-$50 ones would give you what you needed. I was so wrong, professional musician friend convince... read more [+]d me to give thie a try, and I'll never go back to cheap DI's. The difference was startling, and actually made me feel really foolish for using the cheap ones for so long. Spend the money, it's a fraction of what your guitar cost and it makes all the difference. close [-]

Excellent Quality! Worth the money!

by Josh from Philippi, WV
July 14, 2011
Music Background: Instrumental Musician, Instructor, Live Sound Engineer
Granted, a DI is usually not considered a "cool" piece of gear. It comes with no effects, and is usually not something you can impress somebody with. But for those who are serious about clean, unalter... read more [+]ed sound, then a quality DI is very much in demand.

The Pro DI goes beyond quality, both in sound and construction. These things may literally be bullet-proof! Short of repeated drops from the top of a building onto pavement, one would be hard-pressed to damage the internal components. Also, with the outer "jacket" being slightly larger than the main body, a direct impact to the jacks due to a drop is nearly impossible. Being indestructible, however, means nothing if the sound is bad, but this DI sounds great! They are crystal clear, allowing only the true sound of the instrument pass through.

I replaced three budget DI boxes in my church with three Pro DI units, and the difference was immedeate and drastic. As other reviewers have mentioned, the Jensen-equipped units are probably even better (if that's possible), but for the modest sound system at my church, these are as good as it gets.

Do not hesitate to shell out a few extra dollars on this DI. High dollar instruments and accessories can only sound their best if the DI isn't junk. The Pro DI, however, is aptly named, because it truly is a professional piece of equipment. Highly recommended! close [-]

Rock Solid

by Dave Heimann from Massillon, OH
September 5, 2010
Music Background: Worship Leader
We are using six at church and are ordering more because they are great!

Awesome DI

by Brad from Cincinnati, OH USA
February 25, 2009
Music Background: Recording and Live Sound Engineer, Pro Musician
I've used direct boxes before, both in live and studio applications. Usually it's been bass or acoustic guitar. I recently had the need to put a DI on my pedal board since my newest electric guitar ... read more [+]has a piezo bridge in it. All I can say is I don't need to take an acoustic guitar with me to gigs any more.

The ProDI is built like a TANK, too! The housing is 14 gauge press-broken steel. Run over it with your car, I dare you. You can't hurt it!

Easily the VERY BEST DI under $100. Possibly the best DI under $200 close [-]
Read more reviews

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See Also: Direct Injection Boxes , Radial , Radial Direct Boxes

Radial ProDI

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