9. INPUT Section
The input section is used to inspect and configure the audio inputs of the device. A warning is displayed
when a digital input is not present but selected as clock master, or routed to an output and is either not
present or not in sync to the clock master. Related input settings, such as AVB stream size or MADI auto
input, can be configured here.
9.1. Analog Inputs
The analog inputs of the 12Mic can be configured at the device or remotely. Gain, phase, and phantom
power (48V) can be set for all inputs. In addition, the first four channels support toggling the input to
TRS. While switched to TRS, the impedance can be set to High-Z for instrument signals.
Phantom power is only available at the XLR input, high impedance only at the TRS input.
When toggling from TRS to XLR, the current High-Z setting is stored and recalled to its
previous state when toggled back. The phantom power setting is
not
stored and will be
switched off when toggling the channel to TRS.
To protect the input stage, only switch on phantom power
after
connecting a compatible
condenser microphone or accessory. Remember to switch off phantom power when
unplugging a microphone and before saving a preset.
The gain and phase settings are not affected when toggling between XLR and TRS inputs.
Latency and default routing
At single speed sample rates, the converters are configured with short delay 'sharp' IIR filters with
extremely low latencies (5 samples) and flat frequency response over the entire audible range. At higher
sample rates, a short delay 'slow' filter is used to additionally optimize the impulse response. The latency
increases to six samples at quad speed (176.4 kHz, 192 kHz).
A new device has a user-writeable preset 1 with the following default routing. While the factory default
preset (16) does not contain any routings, preset 1 is convenient for plug’n’play operation.
save preset 1 to any other preset for backup if it appears to be useful.
The default setting in preset 1 routes the analog inputs 1-12 to:
• both MADI coaxial and optional MADI SFP (channel 1-12),
• AVB stream 1 (AAF, 12 channels)
• AVB stream 2 (AM824, 8 channels, 1-8) and 3 (AM824, 9-12)
RME 12Mic User’s Guide
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| 9. INPUT Section
