Behringer ULTRA-DIDI20 - Manual (Page 2)

ULTRA-DI DI20
2
Welcome to the BEHRINGER family!
Thank you for the confidence you have placed in us by purchasing
the ULTRA-DI DI20 professional active 2-channel DI-box/splitter.
On stage as well as in studios, it is sometimes advantageous to
connect certain sound sources directly to the mixing console. Since
many instruments (keyboards, for example) don’t have balanced
outputs they require a DI-box. Sometimes, even guitars can’t be
directly connected to mixing consoles because their impedance is
too high.
By using a DI-box, you can directly tap into a high-impedance,
unbalanced signal—for example, a signal between a guitar and a
guitar amplifier. From this point, you can feed this signal directly to a
mixing console.
There are active and passive DI-boxes. A passive DI-box is more
affordable, but its performance is dependent on the impedance of the
device to which it is connected. When the impedance on the mixing
console’s end changes, so does the impedance at the input of the DI-
box. Such DI-boxes only function properly when the connected
impedance values are strictly specified (high at the input, low at the
output). Active DI-boxes are not affected by these impedance
considerations. The input impedance of the DI20 is extremely high,
and it absolutely does not influence the signal flow through the DI-
box. The output impedance is balanced and always very low, whereby
the signal is far less prone to being affected by noise.
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To prevent damaging your loudspeakers, first connect
the DI-box and then hook up the respective channel.
The same goes for alternating between battery and
phantom power operating modes.