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The -20 dB attenuation switches greatly increase the operating range of the ULTRA-DI. From the low-level
signals of a high impedance microphone or guitar to the hot speaker terminals of a P. A. amplifier. Depressing
both will give 40 dB attenuation.
+ Only use the -20 dB switches if you are sure the ULTRA-DI is clipping (overloading) and not your mic pre-
amp. Always use as little attenuation as possible to get the best possible signal-to-noise ratio.
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OUTPUT. This is the balanced microphone level output of the ULTRA-DI. Connection to the microphone input
should be made with a standard high quality balanced cable.
+ Never connect pin 2 or 3 to pin 1 and never disconnect the shield from pin 1, or the unit will not work on
phantom power.
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Use the GROUND LIFT switch to either connect the ground of input and output or keep them completely
separate. Depending on the grounding of the connected devices linking or disconnecting will reduce hum or
prevent ground loops. GROUND LIFT ON means no interconnection.
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Battery compartment. Loosen the screw to open the compartment and to replace the 9 V battery. When the
ULTRA-DI is switched on battery power the LED blinks, when it stops blinking it is time to change the battery.
2. DI100 CONFIGURATIONS
The next section will show several different ways the ULTRA-DI can be hooked up.
2.1 Tapping signal from the (Bass)guitar
Fig 2.1: Guitar ß DI ß Guitar Amp/Mixer
This figure shows the standard application of any direct injection box. The signal to the amplifier is unaffected, it is just
tapped off to be routed to the microphone input of the mixer. Especially bass guitars benefit from this application. It is
difficult to find a microphone which handles high level low frequencies well and with a linear frequency response.
Using the ULTRA-DI will give you clean and crisp sound. Connect the ULTRA-DI after any effects devices so that their
effect will be heard over the P.A.-system or on the recording. If the mixer provides phantom power between 20 V and
52 V, the internal battery of the DI100 will automatically be detached. You should chose this possibility whenever
possible to save battery power.
2.2 Converting the output of a Keyboard / DJ-mixer / Headphone plug
Fig 2.2: DJ-mixer ß 2 x DI ß Mixer
This configuration can be used with a keyboard, DJ-mixer, headphone output, drum kit or any (stereo or mono) line
source. In all cases where you want to run long lines, for instance to the FOH (Front Of House) desk. In most cases
the best setting is achieved by depressing one of the -20 dB pad buttons to avoid overloading the FOH desk input. The
signal can be linked through to another amplifier, if the keyboard player / DJ / etc. wants to have a monitor connected
independent of the foldback mix. The ULTRA-DI acts as both a ground isolator and an unbalanced to balanced
converter.