Metric Halo Mobile I/O - Manual (Page 147)

MIO Console Overview
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• 2882: +26 dBu. The input impedance is approximately 10k Ω, and the inline pad is engaged. Phantom
power is not available.
• LIO-8: +24.5 dBu. The input impedance is approximately 10k Ω, and the Line Input is selected.
• ULN-8: +24.5 dBu. The input impedance is approximately 10k Ω, and the Line Input is selected.
This format is appropriate for interfacing with professional audio equipment.
• Line -10 — This format supports input levels up to:
• 2882: +15 dBu. The input impedance is approximately 10k Ω, and the inline pad is engaged. Phantom
power is not available.
• LIO-8: +13.5 dBu. The input impedance is approximately 10k Ω, and the Line Input is selected.
• ULN-8: +13.5 dBu. The input impedance is approximately 10k Ω, and the Line Input is selected.
This format is appropriate for interfacing with prosumer and consumer audio equipment.
• Inst (Instrument) — This format supports input levels up to +6 dBu. The input impedance is approximately
200k, and the inline pad is not engaged. Phantom power is not available. This format is appropriate for
interfacing with high output impedance sources like guitar pickups.
On the LIO-8 and ULN-8, the front panel DI inputs are always connected in parallel with Line
inputs 1 and 2. The “Inst” option is left here as a visual reminder that the DI input was being used
when the console state is saved.
• Mic — This format supports input levels up to:
• 2882:+6 dBu. The input impedance is approximately 200k Ω (12k Ω with phantom power engaged)
and the inline pad is not engaged. Phantom power is available.
• ULN-8: +20 dBu. The input impedance is approximately 3.3k Ω, and the Mic Input is selected. Phan-
tom power is available.
This format is appropriate for interfacing with dynamic and condenser microphones on low to mid level
sources.
Tip for 2882 users:
You may find that for very low level sources, especially with low-sensitivity microphones, that
your SNR improves if you take advantage of a high-quality external mic preamp. External preamps
are recommended for certain types of recording and microphones, especially classical recording
and ribbon mics.
• Mic/Pad (2882 only)— This format supports input levels up to +26 dBu. The input impedance is approx-
imately 10k, (6k with phantom power engaged) , and the inline pad is engaged. Phantom power is avail-
able. This format is appropriate for phantom powered condenser mics that put out near-line level signals
(often the case when you are using condenser microphones on bass drums or other very loud sources).
– Gain Trim knob
Figure 11.11: Gain Trim Knob
The Gain Trim knob allows you to adjust the analog gain of the input stage in the range determined by the
input standard that you have selected; this range will vary by interface model. The gain is indicated in dB
relative to the nominal level of the input standard you have selected. The gain changes are smoother near the
bottom of the scale, with the steps increasing in size as you reach the gain limit.