*Previously released models had "JDI mk3" printed on them, but now they only have "JDI" printed on them. The logo and other parts have changed from the previous model, but the contents are the same. This is recommended for recording enthusiasts who prioritize natural sound quality that is faithful to the original sound. A simple, natural-sounding, noise-free direct box. This is the ideal direct box that only the RADIAL JDI has achieved. The RADIAL JDI outputs a wide frequency range from 10Hz to 40kHz without any coloration or phase distortion. The key to JDI's high quality is the use of extremely high-quality JENSEN transformers, which excel in ground loop isolation. These JENSEN transformers have extremely high fidelity to the original sound, producing no noise or distortion. This allows the original sound of the instrument to be reproduced naturally, and all the nuances of the player's voice can be reproduced without any loss. In addition to the phase reverse switch, 15dB pad switch, and ground lift switch required for a direct box, the RADIAL JDI also features its own unique stereo to mono switch and parallel speaker switch. The parallel speaker switch is a unique feature not found in previous direct boxes. Connect the amp output signal from a guitar amp or other device in parallel to the speaker cabinet and JDI, and press this switch to automatically activate the 12" speaker simulation filter. This allows you to mix microphone and line signals for recording, for example. The JDI is completely passive - no phantom power or batteries required - just plug in your instrument and play. Features 100% passive Stereo to Monomer Switch Phase Reverse Switch Parallel Speaker In Highly durable chassis Book cover design that prevents unexpected changes to switch settings Isolation pads to prevent ground loops ●Comments Recording Magazine's Radial JDI, with its focus on transparency, is the pure ideal of the direct box world. ALAIN CARON I love using RADIAL direct boxes because they are faithful to the original sound and don't color the sound of the instrument. I don't want to lose the individuality of the instrument, so the high resolution that RADIAL offers is important. WILL LEE It has a natural, present sound. When I used the Radial, the engineer turned to me and said, "What's that? I have to buy one." MARK EGAN My bass is the best sounding it has ever been - the sound is natural, pure and level is great. TONY LEVIN It's extremely clean, quiet, and accurately reproduces the low end. Since I got the Radial, I use it every time I record. Other users BRYAN ADAMS, BRUCE SPRINGSTEEN, CHUCK RANEY, FAITH HILL, GARBAGE, JANET JACKSON, JOURNEY, KDLANG, METALLICA, NINE INCH NAILS, SARAH MACLAUGHLIN, SEAL, VICTOR WOOTEN ●Characteristics Frequency response 10Hz to 80kHz (+/-3dB) Signal to noise 122dBu full bandwidth Distortion