Sonic Nuance Tuner + DI (TDI) Mk2 Pedal

Directed Verdict

Seriously, though. How cool is it that someone finally put a Jensen transformer-based DI into a pedal? In this case, we are talking about the Jensen JT-DB transformer, intended for direct boxes. But first, a refresher on why you might want to have a transformer-based DI. Transformers provide electrical isolation between your rig and the FOH (which keeps noise from one from getting to the other). Transformers can take your unbalanced instrument signal and convert it to a balanced signal (which can be transmitted through a cable for longer distances without losing signal or introducing noise). Transformers can also help match signal gain levels between different devices (like bass amp inputs and mixing board console inputs).

Some potential downsides to transformers are their cost, their added bulk, the possibility of frequency dependent phase shifts, and the potential for external magnetic interference. These last two items are directly addressed [pun intended] by the folks at Jensen, who employ a Besel low-pass filter (to eliminate phase distortion) and multiple Faraday shields to minimize hum, buzz and RF interference. Since 1974, Jensen Transformers, Inc. has been building a reputation for excellence. Forty plus years later, Sonic Nuance lets you take that legendary Jensen performance with you, wherever you (or at least your pedal board) go(es).

Our Technical Editor, Dan Kropp, put the TDI through its paces to prove its technical prowess [his technical evaluation immediately follows this Bassic Review]. I opted for some real world testing. Out on the gig, the TDI did just what I had hoped, with dead-silent connection between my pedalboard and the mixing console. In my typical pedalboard setup, I run my tuner pedal at the very front of my pedalboard, and I use this as my primary means of muting my signal when changing basses, in between sets, or – gasp! – when tuning. It only made sense to use the TDI in similar fashion. At least, it did at first. Then, I realized that if I tapped my FOH DI signal from my typical “tuner pedal slot,” I wouldn’t be getting any of my downstream effects in the mains. This problem was easily remedied, of course, by moving the TDI to the end of my pedal chain.

You Can Tune a Piano, but You Can’t Tuna Fish

The included chromatic tuner stands out for both its tracking speed and for its accuracy. No waiting on the low B to track. It is basically instantaneous. Accuracy is also excellent (with the Mk2 being even more accurate than the Mk1 – which I was also allowed to audition, and which itself is more accurate than many tuner pedals on the market). In fact, it is accurate enough to show the note pull sharp as you initially pluck it. This can take a little getting used to, but with a light touch, and/or a little patience, I think you will appreciate the accuracy (as it quickly indicates the “true” tuning, once your finger quits dragging the string sharp).

The main display will indicate the note detected (if the TDI is in mute mode and power is supplied), and will show “P” for play mode. This main display does include a sharp note indicator, when appropriate, just to the right of the note display. The five tuning level indicator LEDs predictably show if the note is sharp, flat, or in tune. Once you bring the note into perfect tune, the LEDs will momentarily flash. Both the main display and the indicator LEDs are bright enough to be seen on a dark (or sunlit) stage, from standing height.

Bottom Line