Rupert Neve Designs RNDI-S Stereo Active Transformer Direct Box | Palen Music Recording Accessories $399.00 Rupert Neve Designs

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Rupert Neve Designs RNDI-S Stereo Active Transformer Direct Box

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Rupert Neve Designs RNDI-S Stereo Active Transformer Direct Box

An expanded two-channel version of our best-selling RNDI, providing massive tone & headroom for all of your instruments & stereo sources.

The RNDI-S signature sound is the product of custom Rupert Neve Designs transformers and class-A biased, discrete FET amplifiers. The carefully orchestrated union of these two elements is key to the unique response of the RNDI-S, delivering a powerful and vibrant direct sound capable of reproducing the full harmonic depth of basses, guitars, keyboards, acoustic instruments, professional line-level sources and consumer devices with a 3.5mm jack.

With portable, powerful, larger-than-life tone, the RNDI-S is ready to make your stereo or mono direct sources shine.

The Development of the RNDI

After coming into existence during an experimentation with new transformer designs, the RNDI was fine-tuned over a series of listening tests against the the most popular high-end DIs available. It was in these tests where the RNDI always seemed to add another dimension to the sound and bring the instruments to life. The lows felt richer, deeper and fuller, and the highs had outstanding clarity without any added harshness.

Active + Passive: The Best of Both Worlds

The RNDI-S and RNDI’s signature sound is the product both of new custom Rupert Neve-designed transformers and class-A biased, discrete FET amplifiers. The carefully orchestrated union of these two elements is key to their unique response.


The custom transformers provide superior passive isolation while adding musical harmonics and dimension to the sound. The low impedance, transformer-balanced output excels at driving long cable runs, and performance is immensely consistent regardless of the connected equipment. This is very important for both live and studio environments where the unamplified signal may travel almost 100ft before hitting an amplifier. In other designs, these high-capacitance lines cause major reductions in high frequencies – not so with the RNDI.


The class-A & discrete FET amplifier in the RNDI is powered by 48V phantom, and creates a very high impedance input of 2M Ohms that ensures consistent performance with a wide variety of instruments. The class-A design ensures that zero crossover distortion is added to the signal, which can add upper-order odd harmonics that are musically dissonant in nature. With the RNDI, the overwhelming majority of harmonic content is 2nd order (octave) with some 3rd order present (fifth above octave). These musically relevant harmonics, present in subtle amounts, actually add to the richness of the original signal. And the discrete aspect of the RNDI design means there are no ICs or digital components that can have negative effects on the tone.


  • For stereo keyboards, guitars, basses, and piezo-equipped instruments, there are two channels of huge, forceful direct tone
  • 3.5mm stereo input jack for convenient phone, tablet, and other consumer device connections
  • Custom transformers provide strong bottom end and sweet highs while maintaining clarity
  • Flat frequency response within the audible range of 20Hz-20KHz
  • Response time is extended below 10Hz and over 100KHz
  • Complete circuit isolation is provided by transformers and active circuits
  • Excellent, consistent results are provided by extremely low output impedance and phase shift
  • Dual 1/4" input and output jacks; gold-plated XLR output; 48V Phantom power
  • A tough steel chassis designed to survive life on the road


  • Type:Active
  • Channels:Stereo, Dual Mono
  • Ground Lift:Yes
  • Inputs:2 x 1/4" TRS (instrument), 1 x 1/8" TRS (stereo)
  • Outputs:2 x 1/4" (thru), 2 x XLR
  • Power Source:48V Phantom Power
  • Height:1.75"
  • Depth:5"
  • Width:7"
  • Manufacturer Part Number:RNDI-S

Condition:Excellent. Light wear typical of a gently used Item. Light surface scratches, scuffs, etc.

Please feel free to reach out to our knowledgeable sales staff with any additional questions!