Behringer DI20, Руководство пользователя

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6
ULTRA-DI DI20
1. Welcome to the
BEHRINGER Family!
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.
◊
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.
2. Controls
N11999
®
Fig. 2.1: Controls of the DI20