Radial JDI Stereo Premium Passive DI Box - High-Quality Direct Injection for Guitar, Bass & Keyboards | Perfect for Live Performances & Studio Recording

After finally getting to use it, I absolutely believe that this is by far the best passive DI box available. It has completely eliminated (not partially) the sounds caused by the terrible ground loop I have in my house. This ground loop is not of the usual type that just causes "hum", it causes a high pitch tone, beeps, and clicks! It's quite terrible and there is no way to solve it, it's something in this entire city's stupid electricity system. So the only solution when there's no balanced alternative to your unbalanced unit (for example, an analog synthesizer), is a passive DI box. The "ground lift" feature that some units have has no effect whatsoever in this case.So the JDI completely eliminates this ground loop WHILE HAVING NO AUDIBLE EFFECT on the signal. The frequency response and the overall sound is essentially identical. This is with an "active" source - that is, signal coming from a powered unit, not an acoustic instrument like a bass guitar. It should perform pretty well even with non-powered sources, and I've listened to some good samples, but the company rightfully mainly recommends this unit for signal coming from powered units, because that's where it performs optimally. No distortion, high volume level, everything is perfect.Unfortunately, while the overall quality of the JDI is as high as it gets, it's still incredibly overpriced. The single channel version absolutely should not cost $200, and even the $300 the "Stereo" (it's really "dual-channel") version which is the one I got, should NOT cost $300. It's pretty crazy. But I had no choice because I can't afford to inflict any noticeable degradation on the audio signal. I'm not happy with this price, because it's absolutely not a FAIR price, and that's why I would never recommend the JDI units to anyone unless I know they're in exactly the same situation as I am.