[Melodica-Me]

Hi Olivier, you will not have any issues plugging it in to an active DI Box. You plug your melodica out to the input of the D.I. box and the output of the D.I. Box to the input of the mixer. The difference between both is the following. The active D.I. requires a power source like a battery or plugin transformer. The passive D.I. dose not require power but the source needs to have power. You questioned earlier why your melodica did not have a battery, if it did you would then use a passive D.I., thats why you did not hear anything. Some amplifiers have D.I. outputs that you would plug into a passive D.I. and run that to a mixer. You will need an active D.I. to bring the signal of your melodica up to the mixer. If you plug the melodica to an active D.I. to an amplifiers you will get the boost you need for a louder melodica. The D.I. also balances the high impedance of your melodica to a low impeadance (XLR) input of the mixer for better tonality. As long as you do not put the output of the D.I to the input of the melodica you will be OK.
I hope this helps
Melodica-Me