A popular, pricey tube direct box with a good, solid sound. The REDDI has a sound of its own that doesn't favor a particular frequency; no hyped lows or highs. On first impression it was clean and warm, and didn't slightly compress like some tube units inherently do. It apparently has high headroom which keeps the sound from getting squashed at the input, and it has some output gain to crank up if needed. It seems to have strength in the low mid bass, and this separates it from units like the Demeter tube DI, which is more hi-fi than the REDDI. The Demeter is a pro-studio standard that seems to be used less these days in favor of the REDDI. The REDDI isn't aggressive sounding, and presents a nice firm sound. It has a bit more warmth when compared to the Radial JDI passive DI. Although it is a really nice sounding unit, I didn't keep the REDDI because when compared to my TAB V71 DI, the REDDI lacked the midrange detail and overall strength of sound that the TAB circuit offers. The REDDI was too polite in comparison, but I still recommend it to those who want a pro-sounding unit that will work for any session.