MOTU UltraLite Betriebsanweisung PDF herunterladen (Seite 39)

HARDWARE INSTALLATION

AUDIO CONNECTIONS

Here are a few things to keep in mind as you are

making audio connections to your UltraLite AVB

interface.

Mic inputs with preamps

Connect a microphone using a standard mic cable.

☛ Do not connect a +4 dBu (line level) signal to

the mic inputs without using the -20dB Pad. It is

recommended you connect line level signals to the

quarter-inch inputs instead.

Phantom power

If you are connecting a condenser microphone or

another device that requires phantom power,

engage the mic input’s corresponding front-panel

phantom power button.

Preamp gain

The UltraLite AVB’s preamp provides 56 dB of

gain. Use the front panel detented trim knobs to

adjust gain as needed for each input. The LCD

provides visual feedback as you turn the trim knob.

Preamp gain is digitally controlled, so you can

make ﬁne-tuned adjustments in 1dB increments.

You can also adjust preamp gain in the web app. See

“Device tab” on page 12.

-20 dB pad

Each mic input (XLR jack) is equipped with a

-20 dB pad switch, to accommodate input signals

that could overdrive the input.

Guitar inputs

The UltraLite AVB provides two dedicated guitar

inputs on its front panel. These inputs are specially

designed for guitar or bass instruments, with a

high-impedance load of 1 megaohm. Use the knob

to adjust input trim. Range is 24 dB (-12 to +12).

TRS quarter-inch analog inputs and outputs

Quarter-inch analog inputs and outputs are

balanced (TRS) connectors that can also accept an

unbalanced plug.

☛ Quarter-inch analog outputs are not

cross-coupled. Therefore, when connecting an

unbalanced plug, use a TRS plug with the ring

disconnected. Not ﬂoating the negative terminal

will short it to the sleeve ground and cause

distortion.

Analog trims

All quarter-inch analog inputs and outputs can be

trimmed. This allows them to support a variety of

standards, including EBU-R68, SMPTE RP-155,

+4dBu, -10dBV, 2vRMS, 1vRMS.

The UltraLite AVB’s quarter-inch analog inputs are

equipped with high-quality, digitally controlled

analog trim that provides a range from -96 to +22

dB in 1dB steps.

Quarter-inch outputs can be trimmed in the DAC

itself. Range is 24 dB. The Main Outs and Phones

provide full trim range from 0 dB to -∞ (-127).

Trim controls are most easily accessed in the web

app. See “Device tab” on page 12. Trim settings can

also be accessed in the LCD menu.

Optical I/O

The UltraLite AVB provides ADAT optical

(“lightpipe”) connectors (one input and one

output). Together, they provide 8 channels of

ADAT optical digital I/O at 44.1 or 48 kHz, or 4

channels of SMUX optical at 2x sample rates (88.2

or 96 kHz). SMUX operation supports two modes

(item #21 on page 13):

■ Standard — for 2x optical connection to

3rd-party SMUX-compatible hardware products.

■ Type II (Legacy) — for 2x optical connection to

legacy MOTU products that are equipped with

optical ports and support 2x operation.

The optical ports are disabled when the interface is

operating at a 176.4 or 192 kHz.

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