Features And Functions - Radial Engineering JDI Mk3 User Manual

True to the Music
Part 5 – Features and Functions
The ¼" INPUT and THRU connectors
The JDI features two ¼" jacks on the input panel. These are designed to accept normal instrument input levels from basses,
guitars, keyboards, drum machines, etc. The left-most ¼" input is normally connected to the source instrument.
The ¼" connector to the right of the input is normally used as a 'thru' connector
and feeds the instrument signal to the musician's amplifier.
Using the JDI with a bass guitar with this setup allows both the musician
and the engineer to work with the original signal direct from the
bass. This way, the musician can set up his sound on stage
with his own EQ while the engineer can EQ the bass to work
better in the hall.
On live stages, it is common for instruments such as
acoustic guitar to be connected to the DI and then to the
snake system using the Lo-Z XLR output, splitting the
signal to feed the stage monitor mixer for foldback, just
as microphones are. In this case, the thru jack would
not be used.
The MERGE switch
The JDI features an innovative 'merge' function that turns the input
and the thru-put into a 'left-right to mono' mix. Depressing the merge switch introduces a resistive mixer circuit that sums
the two channels at the XLR output. This function allows two sources such as a stereo keyboard or CD player to merge to
'mono', saving valuable channels on the snake and the mixer when you have more sources than available inputs.
To 'merge' simply connect two instruments with similar output levels into the IN and THRU jacks, depress the MERGE switch
to the ON position and you are set to go. The internal resistive mixer is set up to do this without introducing any problems
such as phase cancellation.
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Radial Engineering JDI User Guide