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Passive DI

Passive DI

Passive DI boxes require no power to operate and can handle high signal levels with ease. These are typically preferred by musicians with active instruments like a portable keyboard.

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Radial JDI
R800 1010 00

High performance passive direct box

The Radial JDI is a passive direct box designed to handle extreme signal levels without distortion of any kind. At the heart, the Radial JDI employs the world class Jensen JT-DB-EPC audio transformer delivering a smooth, warm sounding Bessel curve, reminiscent of the finest vintage gear. Ruler flat from 10Hz to 40kHz and with virtually zero phase deviation, the JDI delivers the natural, pure sound of the instrument without artifact. By its no-power passive design, the Radial JDI performs both high-to-low impedance conversion and signal balancing over a magnetic bridge that passes signal while rejecting stray DC voltage. This makes the JDI particularly adept at eliminating hum and buzz caused by ground loops.

Specifications

Audio circuit type Passive, transformer based
Transformer JT-DB-EPC
Number of channels Single channel (mono)
Frequency response 20Hz - 20kHz (±0.2dB)
Dynamic range 135dB
Total harmonic dirstortion 0.05% from 20Hz - 20kHz @ -10dB
Phase deviation 0.3° @ 100Hz ; 3° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +21dB @ 20Hz - 20kHz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial JDI Stereo
R800 1012 00

High performance 2-channel passive direct box

The Radial JDI Stereo is a passive two-channel direct box designed to handle extreme signal levels without distortion of any kind. It employs two world-class Jensen JT-DB-EPC audio transformers to deliver a smooth, warm sounding Bessel curve, reminiscent of the finest vintage gear. Ruler flat from 10Hz to 40kHz and with virtually zero phase deviation, the JDI Stereo delivers the natural, pure sound of the instrument without artifact. By its no-power passive design, the JDI Stereo performs both high-to-low impedance conversion and signal balancing over a magnetic bridge that passes signal while rejecting stray DC voltage. This makes it particularly adept at eliminating hum and buzz caused by ground loops.

Specifications

Audio circuit type Passive, transformer based
Transformer Jensen JT-DBE
Number of channels Two channels (dual mono)
Frequency response 20Hz - 20kHz (±0.2dB)
Dynamic range 135dB
Total harmonic dirstortion 0.05% from 20Hz - 20kHz @ -10dB
Phase deviation 0.3° @ 100Hz ; 3° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +21dB @ 20Hz - 20kHz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial JDI Duplex
R800 1020 00

High performance 2-channel passive direct box

The JDI Duplex takes the exceptional transparency and wide bandwidth of the JDI Stereo passive direct box, and adds numerous connector types and line-level inputs to provide the audio technician with the ability to interface with any stereo sound source. Designed to handle extreme signal levels without distortion, it utilizes two world-class Jensen JT-DB-EPC audio transformers to deliver a smooth, warm sounding Bessel curve - reminiscent of the finest vintage gear. Ruler flat from 10Hz to 40kHz and with virtually zero phase deviation, the JDI Duplex delivers the natural, pure sound of the instrument without artifact. The inputs can be accessed via 1/4", RCA, 3.5mm TRS, or XLR line-level connectors, making it easy to plug in any sound source, from stereo instruments to consumer playback equipment, or professional +4dB line-level audio equipment.

Specifications

Audio circuit type Passive, transformer based
Transformer Jensen JT-DBE
Number of channels Two channels
Frequency response 20Hz - 20kHz (±0.2dB)
Dynamic range 135dB
Total harmonic dirstortion 0.001%; 1kHz/+4dBu; 600 Ohm load
Phase deviation -1° @ 20Hz; 0.5° @ 150Hz; 600 Ohm load
Input impedance 140k Ohm PAD off; 10k Ohm PAD on
Output impedance 600 Ohms
Maximum input +20dB @ 1kHz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial ProDI
R800 1100 00

Passive direct box

The heart of the ProDI is a custom wound Radial transformer. It features an exceptionally high 140kΩ input impedance to reduce loading while enabling the ProDI to handle extreme signal levels at all frequencies without distortion. This is further improved upon with an internal MuMETAL® shield to protect against electromagnetic fields that can cause unshielded transformers to distort.

Specifications

Audio circuit type Passive, transformer based
Transformer Eclipse ET-DB2, 12:1 ratio
Number of channels Single channel (mono)
Frequency response 20Hz - 18kHz (±0.2dB)
Dynamic range 128dB
Total harmonic dirstortion 0.01% from 20Hz - 20kHz @ -10dB
Phase deviation 1° @ 100Hz; 8° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +18dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial ProD2
R800 1102 00

2-channel passive direct box

At the heart of the design are two high performance Eclipse ET-DB2 transformers. These deliver 20Hz to 20kHz performance with less than 1.5dB deviation above 18kHz and are able to withstand tremendous signal levels without distortion. Unlike active circuits that overload when the signal exceeds the rail voltage, transformers saturate. This creates a pleasing effect that naturally rounds out the tone, acting like a subtle limiter which is particularly advantageous when interfacing the ProD2 with digital pianos, samplers and drum machines that can produce excessive dynamics. Transformers are particularly adept at eliminating hum and buzz caused by ground loops.

Specifications

Audio circuit type Passive, transformer based
Transformer Eclipse ET-DB2, 12:1 ratio
Number of channels Two channels
Frequency response 20Hz - 18,5kHz (±0.2dB)
Dynamic range 128dB
Total harmonic dirstortion 0.01% from 20Hz - 20kHz @ -10dB
Phase deviation 1° @ 100Hz; 8° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +18dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial ProAV1
R800 1112 00

Passive Multimedia Direct Box

The ProAV1 provides you with the ability to connect almost any audio source to a PA system, while automatically summing stereo sources to mono to preserve channels and simplify the audio setup. Inputs are available via 1/4", RCA, 3.5mm stereo, and line-level XLR connections, giving you the ability to easily connect to smartphones, tablets, laptops, CD players, or even a +4dB line level output from a console or recording interface. Transformer isolation helps eliminate noise while maintaining a linear frequency response, and a mono balanced XLR output allows you to feed a recording interface or a PA system.

Specifications

Audio circuit type Passive, transformer based
Transformer Eclipse ET-DB2, 12:1 ratio
Number of channels Single channel (mono)
Frequency response 20Hz - 18,5kHz (±0.2dB)
Dynamic range 128dB
Total harmonic dirstortion 0.01% from 20Hz - 20kHz @ -10dB
Phase deviation 1° @ 100Hz; 8° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +18dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial ProAV2
R800 1115 00

Stereo Passive Multimedia Direct Box

The ProAV2 is an indispensable device for live sound engineers and audio-video technicians alike, with the ability to seamlessly interface nearly any device with a pro audio system. A 3.5mm stereo input jack and dual 1/4" and RCA connectors ensure that you won't ever be hunting around for adaptor cables, while ultra-quiet performance with transformer isolation helps eliminate hum and buzz from ground loops. The ProAV2 maintains stereo separation and exhibits linear frequency response from 20Hz to 20kHz, with balanced mic-level XLR outputs that allow you to send signals through a multichannel audio snake on stage or into two channels of a mixing console.

Specifications

Audio circuit type Passive, transformer based
Transformer Eclipse ET-DB2, 12:1 ratio
Number of channels Dual channel (stereo)
Frequency response 20Hz - 18kHz (±0.2dB)
Dynamic range 128dB
Total harmonic dirstortion 0.01% from 20Hz - 20kHz @ -10dB
Phase deviation 1° @ 100Hz; 8° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +18dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial Trim-Two
R800 1117 00

Passive Stereo Direct Box with Level Control

The Trim-Two allows you to connect any playback device and interface it with balanced pro audio equipment without signal loss or hum and buzz from ground loops. It features two transformers which isolate and balance the audio output from your source device, eliminating noise and allowing you to use long cable runs without signal degradation. A handy mono sum switch makes it easy to reduce the output channel count or send the same signal to two destinations at once, and an accessible level control gives you the ability to adjust levels in an instant. Multiple input connector types make it easy to hook up any consumer line level playback source, from laptops & smartphones to DJ equipment. The completely passive design means that you never have to worry about powering the Trim-Two, making it truly plug & play.

Specifications

Audio circuit type Passive, transformer based
Transformer Custom
Number of channels Dual channel (stereo)
Frequency response 20Hz - 20kHz (±0.2dB)
Dynamic range <100dB
Total harmonic dirstortion 0.009%
Phase deviation <10°
Input impedance 10k Ohms, unbalanced
Output impedance 2.8k Ohms, balanced
Maximum input +20dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial StageBug SB-2
R800 0120 00

Compact Passive Direct Box

The compact design begins with a ¼" input and thru-put to feed the on-stage amp. This connects to the custom made Eclipse ET-DB3 transformer which performs the impedance matching and balances the signal. When using extra high output instruments, a -15dB pad can be inserted into the signal path. This enables the SB-2 to be used with active basses and digital pianos that often tend to overload the input side of the interface. An innovative stereo-to-mono merge function provides a convenient way to connect stereo keyboards and computers without having to reset the source for mono operation, saving time and input channels on the PA. The SB-2 output features an XLR wired to the AES standard with pin-2 hot. Once connected, the SB-2 delivers a smooth warm sound reminiscent of older vintage gear. The Eclipse ET-DB3 transformer is magical in its ability to handle extreme signal levels with a natural compression that is pleasing to the ears. The transformer also helps eliminate hum and buzz caused by ground loops by isolating the input from the output. This is augmented with a ground lift switch that lifts pin-1 on the XLR for quiet, professional results.

Specifications

Audio circuit type Passive, transformer based
Transformer Eclipse ET-DB3, 12:1 ratio
Number of channels Single channel
Frequency response 20Hz - 20kHz (±0.5dB)
Dynamic range 115dB
Total harmonic dirstortion 0.005% @ 1kHz
Phase deviation 3° @ 100Hz; 8° @ 50Hz
Input impedance 140k Ohms, unbalanced
Output impedance 1k Ohms, balanced
Maximum input +20dB
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial StageBug SB-5
R800 0150 00

Compact Stereo Laptop Direct Box

The StageBug SB-5 provides an easy to use professional interface for connecting any mobile playback device to a mixer or PA system, with a built-in cable and 3.5mm stereo plug to connect directly to your laptop, smartphone, or tablet. Inside, a pair of custom wound transformers isolate the signals to prevent hum and buzz, and balance the audio to feed long cable runs without noise. Left and right 1/4" TRS outputs are provided for stereo operation, or a mono XLR output can be used to save channels on the PA system. The SB-5 works without any power required, and features additional ground lift and pad switches to eliminate ground loop noise and prevent distortion from high output audio sources.

Specifications

Audio circuit type Passive, transformer based
Number of channels Two channels
Frequency response 20Hz - 20kHz (±1dB)
Dynamic range 100dB
Total harmonic dirstortion 0.01% @ 1kHz
Phase deviation 2° @ 100Hz; 5° @ 50Hz
Input impedance 40k Ohms, unbalanced
Output impedance 2.8k Ohms, balanced
Maximum input +20dB
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial JD6
R800 6000 00

Six-Channel Passive Direct Box

Stemming from the industry standard Radial JDI™, the JD6 incorporates six premium Jensen transformers with extra RF filtering to ensure optimal signal transfer with the minimal noise, phase shift, or distortion. These are also able to withstand extreme signal levels, which makes the JD6 particularly effective when managing high-output active devices such as digital pianos that will often overload most direct boxes or preamps. Each JD6 channel is equipped with a rear-mounted ¼" instrument input and thru-put for the artist's amp plus a balanced XLR output to feed the mixing desk, while Channels 1 and 2 include front panel connectors that switch the input as soon as a cable is inserted for improved efficiency in the studio.

Specifications

Audio circuit type Passive, transformer based
Transformer Jensen JT-DBE; 12:1 ratio
Number of channels 6 channels
Frequency response 20Hz - 20kHz (±0.2dB)
Dynamic range 135dB
Total harmonic dirstortion 0.05% from 20Hz - 20kHz @ -10dB
Phase deviation 0.3° @ 100Hz; 3° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +21dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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Radial ProD8
R800 1120 00

Passive 8-Channel Rackmount Direct Box

The ProD8 features up to 8 direct box outputs in a single 1RU rack space for professional touring, with dual ¼" inputs on each channel to incorporate a backup system or connect up to 16 channels of audio at once. A ¼" TRS effects insert jack on each channel allows for connection to various effects devices while adding greater routing options, while a thru-put jack delivers a direct feed to the artist's playback system. The front panel features isolated XLRs for balanced low-noise outputs, each equipped with ground lift and 180° polarity reverse switches.

Specifications

Audio circuit type Passive, transformer based
Transformer Eclipse ET-DB2, 12:1 ratio
Number of channels 8 channels
Frequency response 20Hz - 18.5kHz (±0.2dB)
Dynamic range 128dB
Total harmonic dirstortion 0.01% from 20Hz - 20kHz @ -10dB
Phase deviation 1° @ 100Hz; 8° @ 20Hz
Input impedance 140k Ohms, unbalanced
Output impedance 150 Ohms, balanced
Maximum input +18dB @ 20Hz
Power Passive - no power required

(For full specifications see manufacturers product site under "links" tab)

 

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